A mild procedure has been developed for the bromodecarboxylation of α,β-carboxylic acids using nano silica supported SiO2-HClO4,
SiO2-KHSO4 as catalysts and KBr as a bromine source in conventional solvothermal, ultrasonic assisted and solvent-free microwave
assisted conditions. The α,β-unsaturated cinnamic acids were converted to corresponding β-bromo styrenes with high regioselectivity,
while aliphatic α,β-unsaturated carboxylic acids afforded related β-bromo alkenes.
已开发出一种温和的方法,用于使用纳米硅胶支撑的SiO2-HClO4、SiO2-KHSO4作为催化剂,以及KBr作为溴源,在传统溶剂热、超声辅助和无溶剂微波辅助条件下对α,β-羧酸进行溴去羧化。α,β-不饱和肉桂酸被高选择性地转化为相应的β-溴苯乙烯,而脂肪族α,β-不饱和羧酸则产生相关的β-溴烯烃。