CF3SO3H–SiO2 as catalyst for Ferrier rearrangement: an efficient procedure for the synthesis of pseudoglycosides
作者:Peiran Chen、Shaoshan Wang
DOI:10.1016/j.tet.2012.11.019
日期:2013.1
An efficient method for the conversion of 2,4,6-tri-O-acetyl-D-glucal to 2,3-unsaturated glycosides by using triflic acid on SiO2 as catalyst has been established. A series of 2,3-unsaturated glucosides were synthesized in good yield and high anomeric selectivity under transition metal-free conditions. (c) 2012 Elsevier Ltd. All rights reserved.
Reaction mechanism from structure-energy relations. 2. Acid-catalyzed addition of alcohols to formaldehyde
作者:Ernest Grunwald
DOI:10.1021/ja00302a019
日期:1985.8
Reaction mechanism from structure-energy relations. 1. Base-catalyzed addition of alcohols to formaldehyde
作者:Ernest Grunwald
DOI:10.1021/ja00302a018
日期:1985.8
CN116751130
申请人:——
公开号:——
公开(公告)日:——
Secondary .alpha.-deuterium isotope effects for the cleavage of formaldehyde hemiacetals through concerted and specific-base-catalyzed pathways
作者:John L. Palmer、William P. Jencks
DOI:10.1021/ja00541a016
日期:1980.10
catalysis by aceticacid or the proton in the cleavage direction. The results indicate that the amount of C-O cleavage in the transition state increases with decreasing pK of the alcohol and increasing pK of the acid catalyst, corresponding to a negative coefficient p/sub yy'/ = par. delta rho/sub n//-par. delta pK/sub 1g/ = par. delta ..beta../sub 1g//-par. delta sigma and a positive coefficient p/sub xy/