Media

Distribution by Scientific Domains
Distribution within Chemistry

Kinds of Media

  • acid media
  • acidic media
  • acute otitis media
  • agar media
  • alkaline media
  • alternative media
  • anisotropic media
  • artificial media
  • basic media
  • biological media
  • broth media
  • cell culture media
  • cell media
  • chromatographic media
  • chronic otitis media
  • chronic suppurative otitis media
  • communication media
  • complex media
  • conditioned media
  • contrast media
  • culture media
  • different culture media
  • different growth media
  • different media
  • digital media
  • dispersive media
  • dissolution media
  • dry media
  • elastic media
  • electronic media
  • extraction media
  • fermentation media
  • filter media
  • fluorou media
  • fractured media
  • granular media
  • growth media
  • heterogeneous media
  • homogeneous media
  • incubation media
  • indigenous media
  • inhomogeneous media
  • isotropic media
  • laboratory media
  • layered media
  • liquid media
  • local media
  • mass media
  • minimal media
  • national media
  • new media
  • news media
  • non-aqueou media
  • nonaqueou media
  • nutrient media
  • ocular media
  • of media
  • optical media
  • organic media
  • other media
  • otitis media
  • participating media
  • physiological media
  • polar media
  • popular media
  • poroelastic media
  • porous media
  • print media
  • random media
  • reaction media
  • rich media
  • selective culture media
  • selective media
  • separation media
  • serum-free media
  • social media
  • solid media
  • solvent media
  • spent media
  • storage media
  • suppurative otitis media
  • synthetic media
  • traditional media
  • tunica media
  • variety of media
  • various media
  • visual media

  • Terms modified by Media

  • media attention
  • media campaign
  • media commentator
  • media composition
  • media condition
  • media consumption
  • media containing
  • media content
  • media coverage
  • media discourse
  • media effects
  • media environment
  • media ethnography
  • media event
  • media exposure
  • media frame
  • media influence
  • media literacy
  • media market
  • media message
  • media outlet
  • media portrayal
  • media practice
  • media report
  • media representation
  • media source
  • media stream
  • media studies
  • media system
  • media technology
  • media text
  • media theory
  • media thickness
  • media type
  • media use
  • media used
  • media violence

  • Selected Abstracts


    DIGITAL MEDIA AND THE ECONOMICS OF CRIME

    ECONOMIC AFFAIRS, Issue 3 2002
    Samuel Cameron
    Digital crime is an area where the application of the economics of crime is complex. In a nutshell, the essential economic problem of digi-crime is the impact of technological progress making transactions costs of enforcement potentially too high, partly because of the low costs of copyright infringement due to technological advance, for there to be substantial amounts of deterrence from punishment. [source]


    PROTEINASES IN HYBRID CATFISH VISCERA: CHARACTERIZATION AND EFFECT OF EXTRACTION MEDIA

    JOURNAL OF FOOD BIOCHEMISTRY, Issue 4 2010
    SAPPASITH KLOMKLAO
    ABSTRACT Proteolytic activity from viscera extract of hybrid catfish (Clarias macrocephalus × Clarias gariepinus) was investigated. Optimal pH and temperature for casein hydrolysis were 9.0 and 50C, respectively. The enzyme was stable to heat treatment up to 40C and over a pH range of 7,11 for 30,120 min. The proteolytic activity was effectively inhibited by soybean trypsin inhibitor, benzamidine, phenylmethylsulfonyl fluoride and N -p-tosyl-L-lysine chloromethyl ketone. Activities of the viscera extract continuously decreased as NaCl concentration increased, while activities increased as CaCl2 concentration increased. Based on the proteinase activity of zones separated by electrophoresis, the molecular mass of the major proteinases in hybrid catfish viscera was 23 and 20 kDa. The effect of extraction media on recovery of proteinases was also studied. Extraction of the viscera powder with 50 mM Tris-HCl, pH 7.0 containing 0.5 M NaCl and 0.2% (v/v) Brij 35 rendered a higher recovery of proteinase activity than other extractants tested (P < 0.05). The results suggested that major proteinases in hybrid catfish viscera were heat-activated alkaline proteinases, most likely trypsin-like serine proteinases. PRACTICAL APPLICATIONS Hybrid catfish viscera is an abundant and underutilized resource that can be used as a unique proteinase source. Proteinase from various sources catalyzes the hydrolysis of peptide bonds. Thus, it is expected that like other proteinases, hybrid catfish proteinase would be useful in biomedical, food and beverage application. Moreover, the presented extraction media could be adopted to recover the trypsin-like serine proteinase from hybrid catfish viscera, which is currently a solid waste of Pa-duk-ra industry. [source]


    VIRULENCE RESPONSE OF A SALMONELLA TYPHIMURIUM HILA:LACZY FUSION STRAIN TO SPENT MEDIA FROM PURE CULTURES OF SELECTED BACTERIA AND POULTRY CECAL MIXED CULTURE

    JOURNAL OF FOOD SAFETY, Issue 3 2002
    J.D. NUTT
    ABSTRACT Virulence gene expression in Salmonella is triggered by a variety of environmental factors including changes in the gastrointestinal environment of birds during different dietary regimes. The objective of this study was to determine if growth of specific microorganisms alters the environmental conditions sufficiently to signal Salmonella Typhimurium virulence response. Spent media was obtained from a Salmonella Typhimurium hilA:lacZY fusion strain, a poultry Salmonella Typhimurium strain, Eschcrichia coli K12, and Lactobacillus caseii Spent media samples were collected after 2, 4, 8 and 24 h of growth in brain heart infusion broth (BHI) and M9 media, ,-galactosidase assays were performed on the samples to determine virulence expression. Virulence response to Salmonella, spent media was 2-fold greater than Lactobacillus spent media at 4, 8 and 24 h growth (P < 0.05). Virulence expression almost doubled when exposed to Salmonella Typhimurium (NONA) spent media compared to mixed culture spent media at 4 h, and Salmonella Typhimurium (NONA) was significantly higher than mixed culture spent media at 24 h (P < 0.05). Based on these results, it appears that growth of similar bacterial species may alter the composition of rich media sufficiently to influence virulence. [source]


    USE OF HIGH-DOSE GADOLINIUM AS CONTRAST MEDIA TO AVOID RADIOCONTRAST MEDIA-INDUCED NEPHROPATHY

    JOURNAL OF RENAL CARE, Issue 1 2009
    Prajej Ruangkanchanasetr
    SUMMARY Patients at risk for radiocontrast media-induced nephropathy (RCIN) with suspected peripheral vascular disease were evaluated with high-dose (0.4 mmol/kg) gadolinium-based (Gd) contrast angiography (AG). The patients who were considered susceptible to RCIN were defined by having one or more of the following: (1) pre-existing serum creatinine (SCr) >124 ,mol/l, (2) diabetes mellitus and (3) age >60 years. An increase in SCr , 44 ,mol/l or , 25% of baseline was considered significant. Ten patients underwent peripheral AG using a high dose of Gd without any adverse reaction. The mean age was 67.8 years. Nine (90%) patients were diabetic. The quality of these images was satisfactory for diagnosis in eight out of 10 patients. None of these patients had significant change in SCr. The mean SCr (±SD) before, at 48 hours and at 72 hours after AG were 182 ± 97, 177 ± 99 and 177 ± 98 ,mol/l, respectively. Based on this limited study, Gd is a promising agent for peripheral angiographic study. In patients at risk for RCIN, the high dose of Gd appears to be safe without obvious nephrotoxicity. [source]


    RAOUL HAUSMANN'S REVOLUTIONARY MEDIA: DADA PERFORMANCE, PHOTOMONTAGE AND THE CYBORG

    ART HISTORY, Issue 1 2007
    MATTHEW BIRO
    This article argues that Hausmann's poetry and performance practices of 1918 and 1919 prepared the ground for the cybernetic imagery that became prevalent in his caricatures, photomontages and assemblages of 1920. Through an examination of Hausmann's poetry and performance strategies, his concept of human identity, and his understanding of the relationship between sexuality and social revolution, a new understanding of Hausmann's visual concerns is developed. In particular, this article investigates why Hausmann's portraits often undermined their sitter's identity; why Hausmann sometimes emphasized sexuality in his representations; and why, in addition to reminding their viewers of mechanized war, Hausmann's images of the human,machine interface anticipated many of the ideas inherent in the concept of the cyborg developed in the later twentieth century. [source]


    Gradient-based Interpolation and Sampling for Real-time Rendering of Inhomogeneous, Single-scattering Media

    COMPUTER GRAPHICS FORUM, Issue 7 2008
    Zhong Ren
    Abstract We present a real-time rendering algorithm for inhomogeneous, single scattering media, where all-frequency shading effects such as glows, light shafts, and volumetric shadows can all be captured. The algorithm first computes source radiance at a small number of sample points in the medium, then interpolates these values at other points in the volume using a gradient-based scheme that is efficiently applied by sample splatting. The sample points are dynamically determined based on a recursive sample splitting procedure that adapts the number and locations of sample points for accurate and efficient reproduction of shading variations in the medium. The entire pipeline can be easily implemented on the GPU to achieve real-time performance for dynamic lighting and scenes. Rendering results of our method are shown to be comparable to those from ray tracing. [source]


    Irradiance Gradients in the Presence of Participating Media and Occlusions

    COMPUTER GRAPHICS FORUM, Issue 4 2008
    Wojciech Jarosz
    Abstract In this paper we present a technique for computing translational gradients of indirect surface reflectance in scenes containing participating media and significant occlusions. These gradients describe how the incident radiance field changes with respect to translation on surfaces. Previous techniques for computing gradients ignore the effects of volume scattering and attenuation and assume that radiance is constant along rays connecting surfaces. We present a novel gradient formulation that correctly captures the influence of participating media. Our formulation accurately accounts for changes of occlusion, including the effect of surfaces occluding scattering media. We show how the proposed gradients can be used within an irradiance caching framework to more accurately handle scenes with participating media, providing significant improvements in interpolation quality. [source]


    Naturalism, Secularism, and Religion: Habermas's Via Media

    CONSTELLATIONS: AN INTERNATIONAL JOURNAL OF CRITICAL AND DEMOCRATIC THEORY, Issue 1 2010
    Richard J. Bernstein
    First page of article [source]


    Current Awareness in Contrast Media and Molecular Imaging

    CONTRAST MEDIA & MOLECULAR IMAGING, Issue 2 2010
    Article first published online: 20 APR 2010
    In order to keep subscribers up-to-date with the latest developments in their field, John Wiley & Sons are providing a current awareness service in each issue of the journal. The bibliography contains newly published material in the field of Contrast Media and Molecular Imaging. Each bibliography is divided into 15 sections: 1 Reviews; 2 General; Contrast Agents: 3 Chemistry; 4 Technique; 5 Experimental; 6 Applications; Molecular Imaging: 7 Carbon; 8 Fluorine; 9 Gallium; 10 Hydrogen; 11 Indium; 12 Iodine; 13 Phosphorus; 14 Technetium; 15 Others. Within each section, articles are listed in alphabetical order with respect to author. If, in the preceding period, no publications are located relevant to any one of these headings, that section will be omitted. [source]


    Current Awareness in Contrast Media and Molecular Imaging

    CONTRAST MEDIA & MOLECULAR IMAGING, Issue 1 2010
    Article first published online: 22 FEB 2010
    In order to keep subscribers up-to-date with the latest developments in their field, John Wiley & Sons are providing a current awareness service in each issue of the journal. The bibliography contains newly published material in the field of Contrast Media and Molecular Imaging. Each bibliography is divided into 15 sections: 1 Reviews; 2 General; Contrast Agents: 3 Chemistry; 4 Technique; 5 Experimental; 6 Applications; Molecular Imaging: 7 Carbon; 8 Fluorine; 9 Gallium; 10 Hydrogen; 11 Indium; 12 Iodine; 13 Phosphorus; 14 Technetium; 15 Others. Within each section, articles are listed in alphabetical order with respect to author. If, in the preceding period, no publications are located relevant to any one of these headings, that section will be omitted. [source]


    Current Awareness in Contrast Media and Molecular Imaging

    CONTRAST MEDIA & MOLECULAR IMAGING, Issue 1 2008
    Article first published online: 11 MAR 200
    In order to keep subscribers up-to-date with the latest developments in their field, John Wiley & Sons are providing a current awareness service in each issue of the journal. The bibliography contains newly published material in the field of Contrast Media and Molecular Imaging. Each bibliography is divided into 15 sections: 1 Reviews; 2 General; Contrast Agents: 3 Chemistry; 4 Technique; 5 Experimental; 6 Applications; Molecular Imaging: 7 Carbon; 8 Fluorine; 9 Gallium; 10 Hydrogen; 11 Indium; 12 Iodine; 13 Phosphorus; 14 Technetium; 15 Others. Within each section, articles are listed in alphabetical order with respect to author. If, in the preceding period, no publications are located relevant to any one of these headings, that section will be omitted. [source]


    Erratum: MR imaging in assessing cardiovascular interventions and myocardial injury

    CONTRAST MEDIA & MOLECULAR IMAGING, Issue 2 2007
    Alexis Jacquier
    Contrast Media and Molecular Imaging, MR imaging in assessing cardiovascular interventions and myocardial injury, Alexis Jacquier, Charles B. Higgins and Maythem Saeed, published in CMMI 2:1, DOI: 10.1002/cmmi122, pp1,15. Contract/Grant Sponsor information relating to Dr. A. Jacquier was absent from the published article. It should be noted that Dr. A. Jacquier was supported by the Société Française de Radiologie, Paris, as a research fellow. [source]


    Current Awareness in Contrast Media and Molecular Imaging

    CONTRAST MEDIA & MOLECULAR IMAGING, Issue 6 2006
    Article first published online: 8 DEC 200
    In order to keep subscribers up-to-date with the latest developments in their field, John Wiley & Sons are providing a current awareness service in each issue of the journal. The bibliography contains newly published material in the field of Contrast Media and Molecular Imaging. Each bibliography is divided into 15 sections: 1 Reviews; 2 General; Contrast Agents: 3 Chemistry; 4 Technique; 5 Experimental; 6 Applications; Molecular Imaging: 7 Carbon; 8 Fluorine; 9 Gallium; 10 Hydrogen; 11 Indium; 12 Iodine; 13 Phosphorus; 14 Technetium; 15 Others. Within each section, articles are listed in alphabetical order with respect to author. If, in the preceding period, no publications are located relevant to any one of these headings, that section will be omitted. [source]


    Current Awareness in Contrast Media and Molecular Imaging

    CONTRAST MEDIA & MOLECULAR IMAGING, Issue 5 2006
    Article first published online: 10 OCT 200
    In order to keep subscribers up-to-date with the latest developments in their field, John Wiley & Sons are providing a current awareness service in each issue of the journal. The bibliography contains newly published material in the field of Contrast Media and Molecular Imaging. Each bibliography is divided into 15 sections: 1 Reviews; 2 General; Contrast Agents: 3 Chemistry; 4 Technique; 5 Experimental; 6 Applications; Molecular Imaging: 7 Carbon; 8 Fluorine; 9 Gallium; 10 Hydrogen; 11 Indium; 12 Iodine; 13 Phosphorus; 14 Technetium; 15 Others. Within each section, articles are listed in alphabetical order with respect to author. If, in the preceding period, no publications are located relevant to any one of these headings, that section will be omitted. [source]


    Why CMMI?,why a new journal on Contrast Media and Molecular Imaging?

    CONTRAST MEDIA & MOLECULAR IMAGING, Issue 1 2006
    Professor Silvio Aime
    [source]


    Gender and Ethnic Diversity Among UK Corporate Boards

    CORPORATE GOVERNANCE, Issue 2 2007
    Stephen Brammer
    This paper investigates the ethnic and gender diversity of the corporate board of UK companies, placing particular emphasis on links to board size and industry characteristics. We employ a novel dataset that covers a large sample of UK PLCs and describes a director's gender, ethnicity and position held. We find both ethnic and gender diversity to be very limited, and that diversity is somewhat less pronounced among executive positions. We find significant cross-sector variation in gender diversity, with an above average prevalence of women in Retail, Utilities, Media and Banking, while such variation in ethnic diversity is considerably less pronounced. Our evidence suggests that a close proximity to final consumers plays a more significant role in shaping board diversity than does the female presence among the industry's workforce. We argue that this shows that board diversity is influenced by a firm's external business environment and particularly an imperative to reflect corresponding diversity among its customers. [source]


    Media Reviews Available Online

    ACADEMIC EMERGENCY MEDICINE, Issue 12 2006
    Article first published online: 28 JUN 200
    Book reviewed in this article: Pediatric Resuscitation: A Practical Approach. Edited by Mark G. Roback, Stephen J. Teach. Anyone, Anything, Anytime (A History of Emergency Medicine) By Brian J. Zink. Emergency Medicine Decision Making: Critical Choices in Chaotic Environments By Scott Weingart, Peter Wyer. Cardiology Clinics: Chest Pain Units issue Edited by Ezra A. Amsterdam, J. Douglas Kirk MD. Pediatric Emergency Medicine Quick Glance Edited by Ghazala Q. Sharieff, Madeline Matar Joseph, Todd W. Wylie. Emergency Medicine Written Board Review. By Scott H. Plantz, Dwight Collman. Emergency Medicine Oral Board Review. By William Gossman, Scott H. Plantz. Emergency Medicine Q & A. By Joseph Lex, Lance W. Kreplick, Scott H. Plantz, Daniel Girazadas Jr. [source]


    Politics and Film: A letter to the Secretary of State, Department for Culture, Media and Sport

    CRITICAL QUARTERLY, Issue 1-2 2008
    COLIN MacCABE
    No abstract is available for this article. [source]


    REMEDIATION AND LOCAL GLOBALIZATIONS: How Taiwan's "Digital Video Knights-Errant Puppetry" Writes the History of the New Media in Chinese

    CULTURAL ANTHROPOLOGY, Issue 2 2007
    TERI SILVIO
    This article analyzes the Pili International Multimedia Company's "digital video knights-errant puppetry" serials, a popular culture genre unique to Taiwan, to answer two questions. First, how do digital technologies, originally developed to meet the needs of the American military and entertainment industries, become embedded in a different cultural context? Second, how does this embedding allow media technologies to become something through which distinctly local models of globalization itself may be imagined? Analyzing both the style of the serials and the discourse of producers and fans, I argue that new media technologies, despite their foreign origins, may not only be adapted or resisted, but may also come to be imagined as emerging from local aesthetics and local needs. Through the specific ways they utilize both digital and traditional technologies, the Pili producers and fans construct a utopian vision of what globalization might look like if Taiwan were at the center. [source]


    Participatory Communication with Social Media

    CURATOR THE MUSEUM JOURNAL, Issue 1 2008
    Angelina Russo
    This marks a shift in how museums publicly communicate their role as custodians of cultural content and so presents debate around an institution's attitude towards cultural authority. It also signifies a new possible direction for museum learning. This article reports on a range of initiatives that demonstrate how participatory communication via social media can be integrated into museum practices. It argues that the social media space presents an ideal opportunity for museums to build online communities of interest around authentic cultural information, and concludes with some recent findings on and recommendations for social media implementation. [source]


    Media in the Museum: A Personal History

    CURATOR THE MUSEUM JOURNAL, Issue 1 2007
    Selma Thomas
    In the past 15 years, both the formats and the applications have changed dramatically, altering the relationships between museums and visitors, and between visitors and collections. Taking on the challenge of the newest media allows museums to experiment and to reinvigorate their interpretive programs. [source]


    Social Media, Social Design

    DESIGN MANAGEMENT REVIEW, Issue 1 2010
    Thomas Lockwood
    No abstract is available for this article. [source]


    Two Faces of Social Media: Brand Communication and Brand Research

    DESIGN MANAGEMENT REVIEW, Issue 1 2010
    Ralf Beuker
    The social web is not just a place to communicate about your brand,it's also a good place to facilitate brand research. But remember that knowing the attitudes and behavior of your target audience comes first. [source]


    The ,Iranian Diaspora' and the New Media: From Political Action to Humanitarian Help

    DEVELOPMENT AND CHANGE, Issue 4 2009
    Halleh Ghorashi
    ABSTRACT This article looks at the shifting position of the ,Iranian diaspora' in relation to Iran as it is influenced by online and offline transnational networks. In the 1980s the exilic identity of a large part of the Iranian diaspora was the core factor in establishing an extended, yet exclusive form of transnational network. Since then, the patterns of identity within this community have shifted towards a more inclusive network as a result of those transnational connections, leading to more extensive and intense connections and activities between the Iranian diaspora and Iranians in Iran. The main concern of the article is to examine how the narratives of identity are constructed and transformed within Iranian (charity) networks and to identify the factors that contribute to this transformation. The authors use the transnational lens to view diasporic positioning as linked to development issues. New technological sources help diaspora groups, in this case Iranians, to build virtual embedded ties that transcend nation states and borders. Yet, the study also shows that these transnational connections can still be challenged by the nation state, as has been the case with recent developments in Iran. [source]


    Digesting Postwar Japanese Media

    DIPLOMATIC HISTORY, Issue 1 2005
    BARAK KUSHNER
    First page of article [source]


    Toward a Reconceptualization of Regional Development Paths: Is Leipzig's Media Cluster a Continuation of or a Rupture with the Past?

    ECONOMIC GEOGRAPHY, Issue 3 2003
    Harald Bathelt
    Abstract: This article develops a model of regional development that is then used to examine the evolution of two media industries in Leipzig, Germany. We note that the city's current media cluster, centered on television/film production and interactive digital media, shares little in common with the city's once-premier book publishing media cluster. Treating interactive learning as the primary causal mechanism that drives economic growth and change, our conceptual framework incorporates both sectoral/technological and political crises as mechanisms that rupture regional development paths. These regional development paths are not homogeneous, but instead consist of bundles of various technological trajectories. Regions recover from crises as their actors continually rebundle local assets until they find a combination that generates growth. As a result of these crises, new opportunities for growth may arise for new and previously marginal industries. In turn, these expanding industries shape the region's development path. [source]


    Solid State Electrochemical Oxidation Mechanisms Of Morin in Aqueous Media

    ELECTROANALYSIS, Issue 9 2005
    Patricia Janeiro
    Abstract The mechanism of electrochemical oxidation of morin has been studied using cyclic, differential pulse and square-wave voltammetry techniques in aqueous electrolyte with solid, insoluble morin hydrate mechanically transferred to a glassy carbon electrode surface, over a wide pH range. The oxidation mechanism proceeds in sequential steps, related with the hydroxyl groups in the three aromatic rings and the oxidation is pH dependent over part of the pH range the oxidation potentials are shifted to lower values with increasing pH. Oxidation of the 2,,4,dihydroxy moiety at the B ring of morin occurs first, at very low positive potentials, and is a one electron one proton reversible reaction. The hydroxyl groups oxidized at more positive potentials were shown to undergo an irreversible oxidation reaction. [source]


    Sonoelectrochemistry in Acoustically Emulsified Media: The Detection of Lead

    ELECTROANALYSIS, Issue 21 2003
    Peter Tom
    Abstract The double extraction of target lead ions which are then voltammetrically quantified via acoustically assisted anodic stripping voltammetry is demonstrated. The technique involves first the extraction of lead from the aqueous volume into an organic phase containing the ligand dithizone (diphenylthiocarbazone). Second, the chelated lead is then stripped into a clean electrochemically clean aqueous solution where the lead from the original solution can be quantified. This method is shown to be applicable in electrochemically fouling media, providing a high sensitivity with a limit of detection for lead in the order of 10,7,mol,dm,3. A theoretical extraction model is presented for the optimal conditions of extraction. The technique is applied to the analysis of lead in wine samples offering quantitative data, which is in good agreement with those obtained from an independent technique (AAS). [source]


    Immobilized Cytochrome c Sensor in Organic/Aqueous Media for the Characterization of Hydrophilic and Hydrophobic Antioxidants

    ELECTROANALYSIS, Issue 18 2003
    Moritz Beissenhirtz
    Abstract A method for the characterization of antioxidants is introduced, which allows the measurement of pure hydrophilic and hydrophobic substances as well as complex cosmetic creams. The sensor is based on cytochrome c covalently immobilized on a gold wire electrode working in mixtures of phosphate buffer and organic solvents. It is combined with a superoxide generating enzyme system. The decrease of the superoxide concentration in the test solution by the added antioxidants is detected and used for the quantification of their antioxidative efficiency. Electrochemical properties of immobilized cytochrome c, such as formal potential and heterogeneous electron transfer rate constant, have been investigated in mixtures of aqueous buffer and DMSO, methanol, butanediol, and THF. The maximum organic solvent content for quasi-reversible electrode behavior was correlated to spectroscopic measurements. The activity of the radical producing enzyme in such media was determined and the radical generation characterized. The antioxidative properties of pure substance such as ascorbic acid and Biochanin A as well as of five anti-ageing cosmetic creams were studied. This showed also the influence of matrix composition on the efficiency of antioxidative supplements. [source]


    Developing the Kharasch Reaction in Aqueous Media: Dinuclear Group 8 and 9 Catalysts Containing the Bridging Cage Ligand Tris(1,2-dimethylhydrazino)diphosphane,

    EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 5 2008
    Alba E. Díaz-Álvarez
    Abstract The dinuclear complexes [{RuCl2(,6 - p -cymene)}2(,-THDP)] (4) and [{MCl(,4 -cod)}2(,-THDP)] [M = Rh (5), Ir (6)], containing the bridging cage-type ligand tris(1,2-dimethylhydrazino)diphosphane (THDP), have been synthesized in high yields (89,95,%) by treatment of dimers [{RuCl(,-Cl)(,6 - p -cymene)}2] (1) and [{M(,-Cl)(,4 -cod)}2] [M = Rh (2), Ir (3)] with one equivalent of THDP. The structure of the (,6 -arene)ruthenium(II) derivative 4 has been unequivocally confirmed by means of X-ray diffraction methods. All these complexes have been found to be active catalysts for the atom-transfer radical addition of bromotrichloromethane to olefins (Kharasch reaction) in heterogeneous aqueous media under mild conditions (room temp.).(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008) [source]