A novel type of chiral molecular clefts was designed and synthesized by using chenodeoxycholic acid as spacer and aromatic compounds as arm.Their structures were confirmed by 1H NMR,IR,MS spectra and elemental analysis.Enantioselective recognition properties of these molecular clefts for amino acid methyl esters were investigated by UV-vis spectra titration. The results indicated that these molecular clefts not only recognize all amino acid methyl esters examined but also possess higher selectivity for L-amino acid methyl esters than for D-amino acid methyl esters.
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.
