α-dideuterio alcohols from carboxylic acid esters. Sodium dispersions are used as the electron donor in this electron transfer reaction, and ethanol-d1 is employed as the deuterium source. This reactionuses stable, cheap, and commercially available reagents, is operationally simple, and results in excellent deuterium incorporation across a broad range of aliphatic esters, which provides an attractive
Triphenylphosphine dibromide: a simple one-pot esterification reagent
作者:Christophe Salomé、Harold Kohn
DOI:10.1016/j.tet.2008.10.062
日期:2009.1
We report a one-pot, expedient protocol for the conversion of carboxylic acids to their esters using excess triphenylphosphinedibromide, base, and the alcohol. The reaction gave the esterified product in moderate-to-high yields (30–95%). For chiral acids, the reaction proceeded with little or no racemization. Use of a chiral alcohol in this transformation gave the ester with retention of configuration
Evaluating a Sodium Dispersion Reagent for the Bouveault–Blanc Reduction of Esters
作者:Jie An、D. Neil Work、Craig Kenyon、David J. Procter
DOI:10.1021/jo501093g
日期:2014.7.18
A new sodium dispersion reagent has been evaluated for the reduction of esters. Na-D15, a sodium dispersion with sodium particle size of 5–15 μm, is a nonpyrophoric reagent that can be handled in air. In this study, a broad range of aliphatic ester substrates were reduced to primary alcohols by Na-D15/i-PrOH with good yields. The method compares favorably with modern metal hydride reductions and is
已经评估了一种新的钠分散剂用于酯的还原。Na-D15是钠粒子大小为5–15μm的钠分散液,是一种非生火试剂,可以在空气中处理。在这项研究中,Na-D15 / i -PrOH可以将多种脂族酯底物还原为伯醇,并具有良好的收率。与传统的金属氢化物还原相比,该方法具有优势,并且比传统的Bouveault-Blanc还原安全,有效得多。
Calculation of the pKa values of alcohols from .sigma. constants and from the carbonyl frequencies of their esters
作者:Sho Takahashi、Louis Arthur Cohen、Harold K. Miller、Evelyn G. Peake