八种拟除虫菊酯立体异构体的气相色谱分离

Gas Chromatographic Separation of the Ste- reoisomers of 8 Synthetic Pyrethroids

Ogierman、戴玉文等曾研究过氯菊酯、氰戊菊酯等菊酯的立体异构体的分离分析。PY116等4个化合物是作者新合成的拟菊酯化合物,其异构体的分离分析,尚未见到报道。为此作者用气相色谱法对8种拟菊酯化合物进行了异构体的分析研究,并讨论了有关文献中的一些问题。

The separation of stereoisomers of eight synthetic pyrethroids has been studied on a gas cluomatograph equipped with a hydrogen flame ionization detector. Four of them were newly synthesized pyrethroids, namely, PY 116,2-methyl-2-pentenyl -2,2-dimethyl-3-(2, 2-dichlorovinyl)-cyclopropane carboxylic ester; PY115, α-cyano-2-methyl-2-pentenyl-2, 2-dimethyl-3-(2. 2-dichlorovinyl)-cyclopropane carboxylic ester; PY125, 2-methyl-2-pentenyl-2, 2-dimethyl-3-( 2, 2-dibromovinyl )-cyclopropane carboxylic ester and. PY126, α-cyano-2-methyl-2-pentenyl-2, 2-dimethyl-3-(2, 2-dibromovinyl)-cyciopropane carboxylic ester. The cis-trans ratios of the six pyrethroids could be determined exactly by their peak area ratios. The stereoisomers of permethrin, pydrin, PY116, and PY125 were completely separated under the gas chromatographic conditions of this work.The problem associated with the use of Silar-10C for analysing permethrin isomers has been discussed. A comparison between the results in this paper and those of Ogierman's has been made.