翻訳と辞書 Words near each other ・ Asymptotic throughput ・ Asymptotically flat spacetime ・ Asymptotically optimal algorithm ・ Asymptotology ・ Asymmetric crying facies ・ Asymmetric cut ・ Asymmetric digital subscriber line ・ Asymmetric dimethylarginine ・ Asymmetric ester hydrolysis with pig-liver esterase ・ Asymmetric federalism ・ Asymmetric flow field flow fractionation ・ Asymmetric follow ・ Asymmetric fund ・ Asymmetric graph ・ Asymmetric hydrogenation ・ Asymmetric induction ・ Asymmetric ion-pairing catalysis ・ Asymmetric Keck allylation ・ Asymmetric membrane capsule ・ Asymmetric multiprocessing ・ Asymmetric norm ・ Asymmetric nucleophilic epoxidation ・ Asymmetric payoff ・ Asymmetric periflexural exanthem of childhood ・ Asymmetric price transmission ・ Asymmetric Publications ・ Asymmetric relation ・ Asymmetric simple exclusion process ・ Asymmetric warfare ・ Asymmetric Warfare Group Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Asymmetric induction ： ウィキペディア英語版 Asymmetric induction Asymmetric induction (also enantioinduction) in stereochemistry describes the preferential formation in a chemical reaction of one enantiomer or diastereoisomer over the other as a result of the influence of a chiral feature present in the substrate, reagent, catalyst or environment.〔IUPAC Gold Book definition (Link )〕 Asymmetric induction is a key element in asymmetric synthesis. Asymmetric induction was introduced by Hermann Emil Fischer based on his work on carbohydrates.〔''Asymmetric Synthesis of Natural Products'', Ari Koskinen ISBN 0-471-93848-3〕 Several types of induction exist. Internal asymmetric induction makes use of a chiral center bound to the reactive center through a covalent bond and remains so during the reaction. The starting material is often derived from chiral pool synthesis. In relayed asymmetric induction the chiral information is introduced in a separate step and removed again in a separate chemical reaction. Special synthons are called chiral auxiliaries. In external asymmetric induction chiral information is introduced in the transition state through a catalyst of chiral ligand. This method of asymmetric synthesis is economically most desirable. ==Carbonyl 1,2 asymmetric induction== Several models exist to describe chiral induction at carbonyl carbons during nucleophilic additions. These models are based on a combination of steric and electronic considerations and are often in conflict with each other. Models have been devised by Cram (1952), Cornforth (1959), Felkin (1969) and others. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Asymmetric induction」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.