Studies on DMDO-mediated benzylidene acetal oxidation
摘要:
We have shown that dimethyldioxirane (DMDO) can be used to effect an oxidative partial deprotection of benzylidene acetals derived from both 1,2- and 1,3-diols to afford hydroxy benzoate products. A wide range of functional groups are tolerated, and good to excellent yields are usually observed. The reactions are easy to perform and produce little waste other than acetone. (C) 2008 Elsevier Ltd. All rights reserved.
生物基甘油和醛已通过缩醛化反应在新型大孔磺化聚苯乙烯型树脂(MR-SP20-SO 3 H 和 MR-SP50-SO 3 H)上获得价值。研究了反应物摩尔比、催化剂用量、温度和反应时间对缩醛活性和选择性的影响。结果表明,MR-SP20-SO 3 H 和 MR-SP50-SO 3 H 证实了在甘油衍生物 1,2-丙二醇、1,3-丙二醇、3-甲氧基-1,2-丙二醇的缩醛化中的高性能和单醋精;这些催化系统可实现回收和再利用。