The phenoxy carboxylic acid derivatives have important bioactivities,extensive application,and the research values in the agriculture,forestry,and environment.It is a very important target to obtain more compounds with higher effect,wider application,better selectivity,and lower toxicity.This article concentrates on the synthesis of the phenoxy carboxylic acid derivatives.The five phenoxy carboxylic acid derivatives herbicides have been designed and synthesized.Three of them were reported for the first time and their structures have been confirmed by^1H NMR,MS and IR.
A series of benzimidazoles containing furyl and aryl substituents at C-2 position have been synthesiszed by the reaction of 1,2,-phenylenediamine with corresponding carboxylic acids under microwave irradiation without solvent,in which artificial zeolite and catalytic amounts of DMF were used as the catalyst and the energy transfer medium,respectively. With such microwave techniques,the reaction times are remarkably shorted and the products are obtained in higher yields and cleaner reactions with easier workup than compared to conventional heating methods.
