The cyclic carbonyl compounds 2 and 8 have been obtained in optical active form (o. y. 46% and 36%, respectively) from the racemic compounds by a deprotonation/protonation sequence using chiral lithium amide 1. The optical activity of 2 is caused by a difference in the deprotonation rates ...
ChemInform Abstract: Highly Efficient Hydroxylation of Carbonyl Compounds with Dimethyldioxirane ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a Chem... W Adam,F Prechtl - 《Cheminform》 被引量: 265...
Crystallographic analysis of a solid solution of two diastereoisomers, i.e. ({(1 S , R )-1-carboxy-3-[( R , S )-methylsulfinyl]propyl}aminocarbonyl)methanaminium tetrachloridoaurate(III) and ({(1 S , R )-1-carboxy-3-[( S , R )-methylsulfinyl]propyl}aminocarbonyl)methanaminium ...
The enantioseparation of some 2,2-dialkyl-4-alkoxycarbonyl-1,3-dioxolane derivatives, which are important intermediates in the total synthesis of a number of biologically active compounds, was studied by means of capillary gas chromatography (CGC). The chromatographic results, obtained on columns coat...
Kinetic Resolution of β-Hydroxy Carbonyl Compounds via Enantioselective Dehydration Using a Cation-Binding Catalyst: Facile Access to Enantiopure Chiral Aldols Org. Lett. (2018) M. Gogoi et al. Selective permeation of L-tyrosine through functionalized single-walled carbon nanotube thin film nanocomposit...
One of the most useful reactions in organic synthesis, the stereocontrolled addition of allylic metal reagents to carbonyl compounds, provides access to en... Rauniyar,Vivek,Hall,... - 《Journal of Organic Chemistry》 被引量: 0发表: 2009年 NEW PROCESS FOR THE PRODUCTION OF RACEMIC AND THE ...
The major diastereoisomer was formed by the attack on the re-face of the carbonyl group in accordance with the non-chelation Felkin–Ahn model 12 in which the largest substituent at Cα (orthoester) is positioned opposite to the incoming nucleophile. After removal of protective groups with ...
Enantiopure organofluorine compounds are at the forefront of innovation in the field of fluorine chemistry. The significant progress in modern fluoroorganic chemistry parallels the tremendous achievements in organocatalysis and organometallic catalysis that have permitted the asymmetric synthesis of chiral chemi...
A homologous series of 4-(4-alkoxyphenoxycarbonyl)phenyl 4-(4-nitrobenzoyl) benzoates has been prepared. The octyloxy and nonyloxy homologs give rise to three kinds of smectic A phases (S1, S2, and S3) and a nematic one, and the decyloxy... Shunsuke,Takenaka,Shigetsugu,... - 《Molecu...
carbonylderivativesstereochemistry(generalopticalresolution)ChemInform is a weekly ing Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform of an article which was published elsewhere, please select a "Full Text" option. The ...