JOURNAL OF FOOD PROCESSING AND PRESERVATION, Issue 2 2009
GUOZHOU LIAO
ABSTRACT Heterocyclic aromatic amines (HAAs) are an important class of food mutagens and carcinogens produced in meats cooked at high temperature. The formation of HAAs in pork floss during processing and the effect of vitamin C and vitamin E on HAAs formation in pork floss were studied. Pork floss was prepared by steaming of raw pork, followed by pressing, tearing, adding various additives, and then the cooked pork was subjected to stir frying. The various HAAs in pork floss were isolated by solid phase extraction and analyzed by high-performance liquid chromatography (HPLC). Results showed that the type and level of HAAs increased with increasing processing temperature. Up to seven HAAs, 9H-pyrido[4,3-b]indole (Norharman), 1-methyl-9H-pyrido[4,3-b]indole (Harman), 2-amino-1- methyl-6-phenylimidazo[4,5-f]pyridine (PhIP), 2-amino-dipyrido[1,2-a: 3,,2,-d]imidazole (Glu-P-2), 3-amino-1-methyl-5H-pyrido[4,3-b]indole (Trp-P-2), 2-amino-9H-pyrido[2,3-b]indole (AaC) and 2-amino-3-methyl-9H-pyrido[2,3-b]indole (MeAaC) were detected in pork floss when stir fried at 150C. Color development increased with cooking temperatures, and was correlated with HAAs formation. The addition of vitamin C at various levels was not effective toward HAAs inhibition. However, the incorporation of 0.1% vitamin E reduced Norharman, PhIP, AaC and MeAaC concentrations in the pork floss. PRACTICAL APPLICATION The formation of heterocyclic aromatic amines (HAAs) is one of the most unfavorable changes during the cooking of food. Since the connection between the consumption of dietary carcinogens and cancer risks in human has been established, interest in this matter has been growing. However, the processing methods and conditions of Chinese traditional food are different from Western, and to date, little is known about HAAs content in the traditional meat products of China. The information derived from this study serves as an essential base of knowledge from a public health standpoint, and contributes to a repository of HAAs information relevant to Chinese cooking; it also can provide clues to understanding the factors that affect HAAs formation and can indicate means of reducing or eliminating these compounds. [source]

ChemInform Abstract: A Highly Diastereoselective Synthesis of Homoallylic Alcohol/Amine Appended Uracils: The Role of the Uracil C-4 Carbonyl in Diastereoselectivity Control.

CHEMINFORM, Issue 41 2001
Subodh Kumar
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

Attachment of Amine- and Maleimide-Containing Ferrocene Derivatives onto Self-Assembled Alkanethiol and Alkanedithiol Monolayers: Voltammetric Evaluation of Cross-Linking Efficiencies and Surface Coverage of Electroactive Groups

ELECTROANALYSIS, Issue 21 2004
Yunfeng Wang
Abstract Ferrocene derivatives containing primary amines and maleimide groups were attached covalently onto N -hydrosuccinimidyl (NHS)-terminated alkanethiol self-assembled monolayers (SAMs) and SAMs of alkanedithiol. The surface coverage and efficiencies of the two cross-linking reactions were evaluated with cyclic voltammetry. All the ferrocene derivatives attached onto the alkanethiol or alkanedithiol SAMs exhibit reversible redox waves. The surface coverage of the aminated ferrocene groups was compared to that of N -hydrosuccinimidyl (NHS)-terminated alkanethiol SAM. The covalent attachment of ,-ferrocenylethylamine onto a 11,11,-dithio-bis(succinimidylundecanoate) SAM yielded an efficiency as high as 63.1%. The cross-linking efficiency of this reaction was found to increase with the nucleophilicity of the amino groups. SAMs of longer alkyl chains favor the attachment of a greater number of ferrocene derivatives. As for the Michael-type electrophilic addition between the sulfhydryl groups of the alkanedithiol SAMs and the ferrocenyl maleimide, the cross-linking efficiencies were found to range from 6.5% to 25.7%, depending on the alkanedithiol chain length. The difference in the efficiencies between the two types of cross-linking reactions might be partially attributable to the steric hindrance imposed by the SAMs and the relative sizes of the functional groups. [source]

The Role of Amine,B(C6F5)3 Adducts in the Catalytic Reduction of Imines with H2: A Computational Study

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 15 2009
Timofei Privalov
Abstract This study thoroughly examines the potential energy surfaces (PESs) of two possible mechanisms for reduction of imines by B(C6F5)3 and H2. The key reaction steps of the first catalytic mechanism, which is the focus of our study, are: (i) the uptake of H2 by a thermally activated amine,B(C6F5)3 species; (ii) proton transfer from the NH2+ moiety of [RNH2CH2R,]+[HB(C6F5)3], to the imine; (iii) nucleophillic attack of the C-center of the iminium ion by the BH, group. The potential energy barriers of the latter, as determined by calculating the evolution of the H-bonded complex of an imine and [RNH2CH2R,]+[HB(C6F5)3], in toluene, are around 10 kcal,mol,1 each. In the second mechanism, only imines serve as basic partners of B(C6F5)3 in the H2 activation, which affords an [RN(H)CHR,]+[HB(C6F5)3], ion pair; direct reduction then proceeds via nucleophilic attack of the C-center by the BH, in [RN(H)CHR,]+[HB(C6F5)3],. This route becomes catalytic when the product amine is released into the solvent and B(C6F5)3 is re-used for H2 activation. Upon taking into account the association energy of an amine,B(C6F5)3 adduct [,9.5 kcal,mol,1 for tBuN(H)CH2Ph and B(C6F5)3 in toluene], the potential energy barrier for H2 uptake by an imine and B(C6F5)3 increases to 14.5 kcal,mol,1. We report a somewhat lower potential energy barrier for H2 uptake by thermally activated amine,B(C6F5)3 adducts [12.7 kcal,mol,1 for the B-N adduct of tBuN(H)CH2Ph and B(C6F5)3 in toluene], although the difference between the two H2 activationbarriers is within the expected error of the computational method. Two catalytic routes are compared based on B3LYP-computed PESs in solvent (toluene).(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source]

Controlled Assembly of [Nb6,xWxO19](8,x), (x = 0,4) Lindqvist Ions with (Amine)copper Complexes

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 21 2008
Travis M. Anderson
Abstract The mixed addenda isopolyanion, [N(CH3)4]2Na2[cis -Nb2W4O19]·18H2O, reacts with Cu(NO3)2 in water and in the presence of NH2CH2CH2NH2 (en) or NH4OH at 60 °C to yield a phase that is decorated {[Cu(en)2(H2O)]2[Nb2W4O19]·2H2O (1)} or charge-balanced {[Cu(NH3)4(H2O)]2[Nb2W4O19]·8H2O (2)}, respectively, by (amine)copper complexes. The prolonged heating at 95 °C of [N(CH3)4]6[Nb10O28]·6H2O, [N(CH3)4]2Na2[cis -Nb2W4O19]·18H2O, or Na4K2[cis -Nb4W2O19]·12H2O and Cu(NO3)2 in a mixed water/amine [en or NH2CH2CH2CH2NH2 (dap)] solution results in the formation of two-dimensional materials with alternate layers of (amine)copper complexes linking Lindqvist [Nb6,xWxO19](8,x), (x = 0,4) clusters. These phasesinclude: [Cu(dap)2]3[Nb4W2O19]·7H2O (3), [Cu(dap)2]3[H2Nb6O19]·6H2O (4), [Cu(dap)2]3[Nb3W3O19]·Cl·6H2O (5), and [Cu(en)2]3[Nb4W2O19]·6H2O (6). Complexes 4 and 5 result from the decomposition of [Nb10O28]6, and [cis -Nb2W4O19]4, to [H2Nb6O19]6, and [fac -Nb3W3O19]5,, respectively, in alkaline solution. Complex 5 contains an extra-framework site that is occupied by Cl,, but this site is occupied by a water molecule in 3 and is vacant in structures 4 and 6. The results of this study suggest that charge density, cluster charge and symmetry, and cluster-cation pairing are all important parameters in the incorporation of d-electron metals onto the surfaces of [Nb6,xWxO19](8,x), (x = 0,4) clusters or into the frameworks of Lindqvist-based complex materials.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008) [source]

Chiral Primary Amine,Polyoxometalate Acid Hybrids as Asymmetric Recoverable Iminium-Based Catalysts

EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 26 2009
Jiuyuan Li
Abstract A new strategy for the immobilization of iminium organocatalysts through the acid,base assembly of multidentate chiral primary amines and solid polyacids is presented. A suitable structurally distinctive C2 -symmetric chiral primary amine (CPA) was identified in this study and the optimal CPA,POM hybrid obtained catalyzed the Diels,Alder cycloaddition of ,-substituted acroleins in high yields and fair-to-high selectivity under aqueous conditions. The primary amine in the metal,organic-framework (MOF)-like catalyst acted as the catalytic center as well as multidentate basic centers, whereas phosphotungstic acid played dual roles as both catalyst anchors and modulators of the activity and stereoselectivity. Furthermore, the MOF-like catalyst showed both high reactivity and physical stability and thus could be recycled and reused six times with only a small loss of activity and selectivity. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source]

Silica-Immobilized NHC,CuI Complex: An Efficient and Reusable Catalyst for A3 -Coupling (Aldehyde,Alkyne,Amine) under Solventless Reaction Conditions

EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 13 2008
Min Wang
Abstract A novel silica-immobilized NHC,CuI complex was developed and used as a highly efficient catalyst in the three-component coupling reactions of aldehydes, alkynes and amines (A3 -coupling). The reactions were applicable to aromatic and aliphatic aldehydes, alkynes and amines, and generated the corresponding propargylamines in good yields only in the presence of SiO2,NHC,CuI (2 mol-%) at room temp. under solvent-free reaction conditions. Moreover, the catalyst was quantitatively recovered from the reaction mixture by a simple filtration and reused for ten cycles with almost consistent activity.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008) [source]

Dual Amine- and Brønsted Acid-Catalyzed ,-Allylic Alkylation of Aldehydes

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 9 2010
Li-Wen Xu
Abstract A very simple method was developed for the direct, palladium-free catalytic ,-allylic alkylation of aldehydes. The direct organocatalytic intermolecular ,-allylic alkylation reaction was mediated by a simple combination of Brønsted acid and enamine catalysis which furnished ,-allylic alkylated aldehydes and cyclohexanone in high yields and chemoselectivities. The reaction conditions are mild and environmental friendly, the process is conducted under an atmosphere of air without the need for dried solvents, and water is the only side product of the allylic alkylation reaction. [source]

Semiconductor-Gold Nanocomposite Catalysts for the Efficient Three-Component Coupling of Aldehyde, Amine and Alkyne in Water

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 17 2009
Leng Leng Chng
Abstract An efficient heterogeneous lead sulfide-gold catalyst has been successfully developed for the synthesis of propargylic amines via a three-component coupling reaction of aldehyde, amine and alkyne in water. The process is simple and applicable to a diverse range of aromatic and aliphatic aldehydes, amines and alkynes. Furthermore, the catalyst is stable to air and water, and can be easily recovered and reused. [source]

Hybrid Inorganic-Organic Materials Carrying Tertiary Amine and Thiourea Residues Tethered on Mesoporous Silica Nanoparticles: Synthesis, Characterization, and Co-Operative Catalysis

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 1-2 2009
Alessandra Puglisi
Abstract Mesoporous silica nanoparticles carrying different loadings of tertiary amine and thiourea residues (residues ratios 53/47, 68/32, and 22/78, respectively) were synthesized by the co-condensation method and fully characterized by CP MAS NMR, powder XRD, SEM, BET, BJH and FT-IR techniques. These materials were tested as bifunctional catalysts in the conjugate addition of acetylacetone to 2-nitrostyrene, a reaction that under solvent-free conditions occurred in quantitative yield. By carrying out several experiments with the bifunctional catalysts featuring different molar ratios of active sites, and with different combinations of monofunctional supported and non-supported catalyst, the co-operativity of the tertiary amine and thiourea residues in catalyzing the reaction was demonstrated. The use of the bifunctional catalyst was extended to the addition of acetylacetone to an activated imine. Catalyst recycling for a total of three reaction cycles was demonstrated without significant erosion of activity. [source]

Weld line characteristics of PC/ABS blend.

JOURNAL OF APPLIED POLYMER SCIENCE, Issue 6 2008

Abstract The effects of reactive compatibilizer and processing temperature on the morphology and the mechanical properties at the weld line of 60/40 (wt/wt) poly- carbonate (PC) and acrylonitrile-butadiene-styrene (ABS) copolymer blends were investigated. Amine functionalized styrene/n -phenyl maleimide/maleic anhydride terpolymer (amine-SPMIMA) was used as the in-situ reactive compatibilizer for PC/ABS blend. Weld tensile strength increased as the content of amine-SPMIMA was increased. Weld impact strength showed maximum value for the blend containing about 3% amine-SPMIMA. The variation in the mechanical property at the weld line was correlated with the change in the morphology of the blend. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 [source]

Melt amination of polypropylenes

JOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 18 2005
Q.-W. Lu
Abstract Amine (primary and secondary) functional polypropylenes were prepared by the melt blending of maleated polypropylenes with small diamines, including hexamethylenediamine (primary,primary diamine), p -xylylenediamine (primary,primary diamine), and N -hexylethylenediamine (primary,secondary diamine), at various diamine/anhydride molar ratios in a batch mixer and a twin-screw extruder. The experimental conversion data by Fourier transform infrared nearly agreed with the assumption of a complete reaction between the primary amine and anhydride. Chain extensions of the maleated polypropylenes by the diamines were monitored by the torques during mixing and further evaluated by rheological (dynamic shear rheometry) and mechanical measurements. We show that these amino polypropylenes are very effective adhesion promoters and compatibilizers of thermoplastic polyurethanes with polypropylene. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 4217,4232, 2005 [source]

Oxygen Uptake and Involvement of Superoxide Radicals upon Photolysis of Ketones in Air-saturated Aqueous Alcohol, Formate, Amine or Ascorbic Acid Solutions

PHOTOCHEMISTRY & PHOTOBIOLOGY, Issue 3 2006
Helmut Görner
ABSTRACT The photolysis of acetophenone, benzophenone, 4-carboxy-benzophenone and benzil was studied in air-saturated aqueous solution in the presence of alcohols. The overall reaction is an oxidation of 2-propanol to acetone. The quantum yield of oxygen uptake (, -O2) increases with increasing 2-propanol concentration up to 0.9. The photoreaction can also be initiated by quenching of the ketone triplet state by ascorbic acid, formate or an amine e.g. triethylamine. Subsequent reactions of the involved radicals with oxygen yield the super-oxide radical and eventually hydrogen peroxide. For the ketones in the presence of 3,30 mM ascorbic acid or triethylamine , -O2= 0.3,0.9. The specific properties of ketones, including 4-methoxyacetophenone and 2-acetonaphthone, the radicals involved and the pH and concentration dependences of , -O2 are discussed. [source]

Metal-Free Direct Asymmetric Aminoxylation of Aldehydes Catalyzed by a Binaphthyl-Based Chiral Amine,

ANGEWANDTE CHEMIE, Issue 37 2010
Taichi Kano Dr.
Rein organisch: Die Titelreaktion von Aldehyden mit dem in situ aus TEMPO und Benzoylperoxid (BPO) gebildeten Oxoammoniumsalz 1 wird durch das sekundäre Amin (S)- 2 mit Binaphthylgerüst katalysiert. Auf diesem Weg sind luft- und feuchtigkeitsbeständige optisch aktive ,-Aminoxyaldehyde zugänglich, die als chirale Bausteine genutzt werden können. [source]

Tertiary Amine Mediated Tandem Cross-Rauhut,Currier/Acetalization Reactions: Access to Functionalized Spiro-3,4-Dihydropyrans,

ANGEWANDTE CHEMIE, Issue 51 2009
Weijun Yao
,-Protonentransfer ermöglichte die hoch selektive Titelreaktion, bei der cyclische ,-Halogenenale 1 mit ,,,-ungesättigten ,-Ketoestern 2 zu funktionalisierten Spiro-3,4-dihydro-2H -pyranen 3 reagieren, in deren Gerüst ein ,-quartäres Kohlenstoffzentrum und eine Vinylhalogenidgruppe benachbart sind. DBU=1,8-Diazabicyclo[5.4.0]undec-7-en, Tos=4-Toluolsulfonyl. [source]

Organocascade Reactions of Enones Catalyzed by a Chiral Primary Amine,

ANGEWANDTE CHEMIE, Issue 39 2009
Li-Yuan Wu
Durch chirale primäre Amine werden acyclische ,,,-ungesättigte Ketone für eine charakteristische Sequenz aus zwei Michael-Additionen aktiviert. Dieser Ansatz bietet eine Alternative für die Entwicklung organokatalysierter Reaktionskaskaden (siehe Schema, EWG= elektronenziehende Gruppe) und ergänzt die Diels-Alder-Reaktion bei der einstufigen, hoch stereoselektiven Synthese komplizierter Cyclohexangerüste. [source]

ChemInform Abstract: Unprecedented Cu(I)-Catalyzed Microwave-Assisted Three-Component Coupling of a Ketone, an Alkyne, and a Primary Amine.

CHEMINFORM, Issue 43 2010
Olga P. Pereshivko
Abstract The title reaction ("KA2 coupling") represents a general approach to various secondary propargylamines. [source]

ChemInform Abstract: Fe3O4 Nanoparticles: A Robust and Magnetically Recoverable Catalyst for Three-Component Coupling of Aldehyde, Alkyne and Amine.

CHEMINFORM, Issue 34 2010
Tieqiang Zeng
No abstract is available for this article. [source]

ChemInform Abstract: An Effective Kinetic Resolution of Racemic Secondary Benzylic Alcohols Using 3-Pyridinecarboxylic Anhydride and a Chiral Acyl-Transfer Catalyst in the Absence of Tertiary Amine.

CHEMINFORM, Issue 21 2010
Kenya Nakata
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

ChemInform Abstract: Tertiary Amine Mediated Tandem Cross-Rauhut,Currier/Acetalization Reactions: Access to Functionalized Spiro-3,4-dihydropyrans.

CHEMINFORM, Issue 17 2010
Weijun Yao
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

ChemInform Abstract: Semiconductor-Gold Nanocomposite Catalysts for the Efficient Three-Component Coupling of Aldehyde, Amine and Alkyne in Water.

CHEMINFORM, Issue 12 2010
Leng Leng Chng
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

ChemInform Abstract: A Novel Three-Component Reaction of a Secondary Amine and a 2-Hydroxybenzaldehyde Derivative with an Isocyanide in the Presence of Silica Gel: An Efficient One-Pot Synthesis of Benzo[b]furan Derivatives.

CHEMINFORM, Issue 2 2010
Ali Ramazani
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

ChemInform Abstract: Highly Enantio- and Diastereoselective Michael Addition of Cyclohexanone to Nitroolefins Catalyzed by a Chiral Glucose-Based Bifunctional Secondary Amine,Thiourea Catalyst.

CHEMINFORM, Issue 51 2009
Aidang Lu
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

ChemInform Abstract: Copper-Free Sonogashira Coupling in Amine,Water Solvent Mixtures.

CHEMINFORM, Issue 13 2009
Anna Komaromi
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

ChemInform Abstract: An Unexpected Diethyl Azodicarboxylate Promoted Dehydrogenation of Tertiary Amine and Tandem Reaction with Sulfonyl Azide.

CHEMINFORM, Issue 8 2009
Xiaoliang Xu
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

ChemInform Abstract: Three-Component Reaction of 2-Alkynylbenzaldehyde, Amine, and Nucleophile Using Lewis Acid Surfactant Combined Catalyst in Water.

CHEMINFORM, Issue 36 2008
Yang Ye
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

ChemInform Abstract: AgOTf-Catalyzed One-Pot Reaction of 2-Alkynylbenzaldehyde, Amine, and Sodium Borohydride.

CHEMINFORM, Issue 33 2008
Qiuping Ding
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

ChemInform Abstract: An Enantioselective Biginelli Reaction Catalyzed by a Simple Chiral Secondary Amine and Achiral Broensted Acid by a Dual-Activation Route.

CHEMINFORM, Issue 32 2008
Junguo Xin
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

ChemInform Abstract: Lewis Acid Catalyzed Formation of Ugi Four-Component Reaction Product from Passerini Three-Component Reaction System Without an Added Amine.

CHEMINFORM, Issue 21 2008
Wei-Min Dai
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

Silica-Immobilized CuI: An Efficient Reusable Catalyst for Three-Component Coupling Reaction of Aldehyde, Amine and Alkyne.

CHEMINFORM, Issue 52 2007
Pravin R. Likhar
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source]