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Various Functionalities (various + functionality)
Selected AbstractsMicrobial Baeyer,Villiger Oxidation of Prochiral Polysubstituted Cyclohexanones by Recombinant Whole-Cells Expressing Two Bacterial MonooxygenasesEUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 5 2005Marko D. Mihovilovic Abstract The microbial Baeyer,Villiger oxidation of prochiral 3,5-dimethylcyclohexanones bearing various functionalities with recombinant E. coli cells overexpressing cyclohexanone monooxygenase from Acinetobacter sp. NCIMB 9871 and cyclopentanone monooxygenase from Comamonas sp. NCIMB 9872 has been investigated. A distinct difference in substrate specificity and stereoselectivity of the two enzymes was observed, and enantiocomplementary products were obtained in some cases. The biocatalytic systems enabled access to chiral lactones as valuable intermediates for the total synthesis of various natural compounds. Substituents with varying lipophilicity and hybridization have been prepared by a diastereoselective synthetic route and subsequently bio-transformed for the investigation of conformational and electronic effects on the biooxidation,. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005) [source] Metamaterials: How Far Are We from Making Metamaterials by Self-Organization?ADVANCED FUNCTIONAL MATERIALS, Issue 7 2010The Microstructure of Highly Anisotropic Particles with an SRR-Like Geometry (Adv. Funct. As part of ongoing efforts to create metamaterials by engineered self-organization using solidification of eutectics, D. A. Pawlak et al. report on page 1116 the fabrication of a fractal material with split-tubes mimicking (in cross section) the famous split-ring resonators (SRRs). The latter, when made of metal, are the basic element of a structure showing negative refractive index. This article shows that metallo-dielectric structures can be fabricated. The method employed has high potential for manufacturing materials with various functionalities. [source] Dibenzotetrathiafulvalene Bisimides: New Building Blocks for Organic Electronic Materials**,ADVANCED MATERIALS, Issue 19 2007K. Gao A new class of organic species, dibenzotetrathiafulvalene bisimides (see figure), were designed and synthesized by using a facile and general synthetic strategy. The new bisimides possess a diverse library of derivatives with various functionalities at the imide rings, and they show promise for use in a range of organic electronic applications. [source] Claisen,Schmidt Condensation Catalyzed by Metal-Organic FrameworksADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 4 2010Amarajothi Dhakshinamoorthy Abstract Metal-organic framework [Fe(BTC) (BTC=1,3,5-benzenetricarboxylic acid)] is a convenient heterogeneous catalyst for the carbon-carbon bond forming reaction in toluene between acetophenone and benzaldehyde to give selectively chalcone in high yield. Fe(BTC) appears as a general catalyst able to synthesize selectively different chalcone derivatives bearing various functionalities. Fe(BTC) could be recycled with no significant loss of catalytic efficiency and crystallinity in subsequent runs. [source] Efficient Copper-Catalyzed Synthesis of N -Alkylanthranilic Acids via an ortho -Substituent Effect of the Carboxyl Group of 2-Halobenzoic Acids at Room TemperatureADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 10 2009Liang Zeng Abstract We have developed an efficient copper-catalyzed method for the synthesis of N -alkylanthranilic acids. The protocol uses inexpensive copper(I) iodide/racemic 1,1,-binaphthyl-2,2,-diol (rac -BINOL) as the catalyst/ligand system, readily available 2-halobenzoic acids and aliphatic amines as the starting materials, the coupling reactions were performed at room temperature, and various functionalities in the substrates were tolerated. [source] Integrated surface modification of fully polymeric microfluidic devices using living radical photopolymerization chemistryJOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 4 2006Robert P. Sebra Abstract Surface modification using living radical polymerization (LRP) chemistry is a powerful technique for surface modification of polymeric substrates. This research demonstrates the ability to use LRP as a polymer substrate surface-modification platform for covalently grafting polymer chains in a spatially and temporally controlled fashion. Specifically, dithiocarbamate functionalities are introduced onto polymer surfaces using tetraethylthiuram disulfide. This technique enables integration of LRP-based grafting for the development of an integrated, covalent surface-modification method for microfluidic device construction. The unique photolithographic method enables construction of devices that are not substrate-limited. To demonstrate the utility of this approach, both controlled fluid flow and cell patterning applications were demonstrated upon modification with various chemical functionalities. Specifically, poly(ethylene glycol) (375) monoacrylate and trifluoroethyl acrylate were grafted to control fluidic flow on a microfluidic device. Before patterning, surface-functionalized samples were characterized with both goniometric and infrared spectroscopy to ensure that photografting was occurring through pendant dithiocarbamate functionalities. Near-infrared results demonstrated conversion of grafted monomers when dithiocarbamate-functionalized surfaces were used, as compared to dormant control surfaces. Furthermore, attenuated total reflectance/infrared spectroscopy results verified the presence of dithiocarbamate functionalities on the substrate surfaces, which were useful in grafting chains of various functionalities whose contact angles ranged from 7 to 86°. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 1404,1413, 2006 [source] ChemInform Abstract: Synthesis of Uracil Derivatives and Their Alkylation: An Approach to Peptide Non-nucleic Acid Monomers.CHEMINFORM, Issue 37 2010Madhukar N. Jachak Abstract The introduction of various functionalities at N-1 position of uracils (II) leads to derivatives of type (IV). [source] ChemInform Abstract: Highly Efficient Synthesis of Phenols by Copper-Catalyzed Oxidative Hydroxylation of Arylboronic Acids at Room Temperature in Water.CHEMINFORM, Issue 36 2010Jimin Xu Abstract The method is compatible with various functionalities and affords the desired phenols in good to excellent yields. [source] | |||||||||||||