Abstract
The pentachlorophenyl trichloroacetate and dichloroacetate which were known as a soil sterilizer or a plant growth regulator, were subjected to the ester-exchange reaction with trialkylammonium salts of acylamino acids, and it has been found that they are excellent reagents for the preparation of the pentachlorophenyl active esters of acylamino acids which are known as intermediates in peptide synthesis. Some acylpeptide esters were also synthesized by the direct method utilizing these reagent, thus, the peptide derivatives were obtained in excellent yields and satisfactory purities.
