Activated Basic Alumina Promotes a Mild, Clean and High-Yield Racemization-Free Synthesis of t-Butyl Esters from Chiral Acid Bromides and t-Butyl Alcohol
作者:Kazuo Nagasawa、Keiko Ohhashi、Asami Yamashita、Keiichi Ito
DOI:10.1246/cl.1994.209
日期:1994.2
Esterification of a variety of acid bromides having even steric bulkiness with t-BuOH/activated basic alumina gave the corresponding t-butylesters in good to excellent yields. In the case of chiral acid bromides, no racemization has been ascertained for the first time.
Reactivity of chlorinating agents/PPh3 for the chlorination of alcohols and carboxylic acids: a comparative study
作者:Wanchai Pluempanupat、Oraphin Chantarasriwong、Piyada Taboonpong、Doo Ok Jang、Warinthorn Chavasiri
DOI:10.1016/j.tetlet.2006.11.060
日期:2007.1
The reactivity of chlorinating agents was examined with the aid of 1H NMR using competitive reactions between selected chlorinating agents and CBr4 towards alcohols and carboxylic acids. The reactivity was greatly dependent on the type of substituent on the chlorinating agents. COCCl3 and CN substituted trichloromethyl groups enhanced the reactivity of the chlorinating agent with PPh3 for the chlorination
在选定的氯化剂和CBr 4之间对醇和羧酸的竞争反应下,借助1 H NMR检验了氯化剂的反应性。反应性很大程度上取决于氯化剂上取代基的类型。COCCl 3和CN取代的三氯甲基增强了氯化剂与PPh 3的醇和羧酸氯化反应性。
Reagents and synthetic methods. 61. Reaction of hindered trialkylsilyl esters and trialkylsilyl ethers with triphenylphosphine dibromide: preparation of carboxylic acid bromides and alkyl bromides under mild neutral conditions
作者:Jesus M. Aizpurua、Fernando P. Cossio、Claudio Palomo
DOI:10.1021/jo00375a034
日期:1986.12
Froeyen, Paul, Phosphorus, Sulfur and Silicon and the Related Elements, 1995, vol. 102, # 1-4, p. 253 - 260
作者:Froeyen, Paul
DOI:——
日期:——
AIZPURUA J. M.; COSSIO F. P.; PALOMO C., J. ORG. CHEM., 51,(1986) N 25, 4941-4943