An Unusual Conformation of α-Haloamides Due to Cooperative Binding with Zincated Porphyrins
作者:Marina Tanasova、Qifei Yang、Courtney C. Olmsted、Chrysoula Vasileiou、Xiaoyong Li、Mercy Anyika、Babak Borhan
DOI:10.1002/ejoc.200900089
日期:2009.9
with a zinc porphyrin leads to an unprecedented conformation for the determination of the absolute stereochemistry of α-haloamides (α-halocarboxylic acids derivatized with 1,4-phenylenediamine) through the use of exciton-coupled circular dichroism (ECCD). With the use of chiral lactams, whose rotomeric contributions are minimized, both ECCD and NMR spectroscopy demonstrate that the porphyrin favors binding
Smectic liquid crystal compound and liquid crystal compositions
申请人:AJINOMOTO CO., INC.
公开号:EP0159872A2
公开(公告)日:1985-10-30
A liquid crystal compound of the formula:
wherein R1 is an alkyl group, X is chloro or bromo, and R2 is a branched-alkyl group; and the carbon atom marked with an * I is an asymmetric carbon atom.
一种液晶化合物,其式如下: 其中 R1 是烷基,X 是氯或溴,R2 是支链烷基;标有 * I 的碳原子是不对称碳原子。
Synthetic Methods and Reactions XII<sup>1</sup>. Preparation of α-Fluorocarboxylic Acids from α-Amino Acids via Diazotization in Polyhydrogen Fluoride/Pyridine Solution.
作者:George A. OLAH、John WELCH
DOI:10.1055/s-1974-23388
日期:——
Organic Fluorine Compounds. III. Action of Perchloryl Fluoride on Substituted Ethyl Cyanoacetates and Animal Toxicities of the Fluorinated Products<sup>1-3</sup>
作者:Herman. Gershon、Stephen G. Schulman、A. David. Spevack
DOI:10.1021/jm00316a008
日期:1967.7
Electrolytic reactions of fluoro organic compounds. 7. Anodic methoxylation and acetoxylation of 2,2,2-trifluoroethyl sulfides. Preparation of highly useful trifluoromethylated building blocks
作者:Toshio Fuchigami、Kayoko Yamamoto、Yuki Nakagawa
DOI:10.1021/jo00001a028
日期:1991.1
Anodic methoxylation and acetoxylation of 2,2,2-trifluoroethyl sulfides and the corresponding nonfluorinated sulfides were comparatively studied. It was found that a trifluoromethyl group remarkably promoted anodic substitution and methoxy and acetoxy groups were introduced adjacent to the trifluoromethyl group of the sulfides. Longer perfluoroalkyl groups also promoted these anodic substitutions. These products were shown to be highly useful building blocks for the synthesis of fluoro organic compounds.