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Sulfur Analogue (sulfur + analogue)
Selected AbstractsA New Tricyclic Ring and a Nitrogen,Sulfur Analogue of the Tri-pentagon Bowl: Cycloaddition Reactions of the Unstabilized 1,3,4-Thiadiazolium-3-methanide 1,3-Dipole: Steric Influences on the endo-Effect: Substituted Pyrrolo[2,1-b]-1,3,4-thiadiazole Systems: Azolium 1,3-Dipoles.CHEMINFORM, Issue 18 2003Richard N. Butler Abstract For Abstract see ChemInform Abstract in Full Text. [source] ChemInform Abstract: A New Tricyclic Ring and a Nitrogen,Sulfur Analogue of the Tri-pentagon Bowl.CHEMINFORM, Issue 6 20021-b]-, 4-thiadiazole-endo-, 7-dicarboxyimides., 7a-Tetrahydropyrrolo [, Substituted 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] Stabilizing effect of intramolecular lewis base toward racemization of optically active selenoxidesHETEROATOM CHEMISTRY, Issue 3 2007Takahiro Soma 2-(Methylchalcogenomethyl)diphenyl selenoxides 1 and 2-{2,-(N,N-dimethylamino)ethyl}phenyl alkyl (or aryl) selenoxides 2, which were expected to be stabilized toward racemization by intramolecular coordination, were synthesized and optically resolved into their enantiomers on an optically active column using high-performance liquid chromatography. Relationship between the absolute configurations and the chiroptical properties of the enantiomers was clarified by comparing with those of sulfur analogues. Stabilities toward racemization of optically active selenoxides 1a and 1b were nearly equal to that of 2-{(N,N-dimethylamino)methyl}diphenyl selenoxide and mesityl phenyl selenoxide. The rates of racemization for optically active selenoxides 2 were found to be faster than that of 2-{(N,N-dimethylamino)methyl}phenyl alkyl (or aryl) selenoxides. © 2007 Wiley Periodicals, Inc. Heteroatom Chem 18:301,311, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20299 [source] The first synthesis of optically active 1-substituted taurinesHETEROATOM CHEMISTRY, Issue 6 2005Jiaxi Xu Optically active 1-substituted taurines, a type of important sulfur analogues of naturally occurring amino acids, and their N-benzyloxycarbonyl-protected derivatives were synthesized from the corresponding optically active ,-amino secondary alcohols in three steps via N-protection with benzyl chloroformate, substitution with thiolacetic acid under Mitsunobu conditions, and oxidation with performic acid. © 2005 Wiley Periodicals, Inc. Heteroatom Chem 16:466,471, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20133 [source] | ||||||||||