顺,反式环丙烷衍生物异构体的区分

在化学电离条件下，研究了４种顺、反式环丙烷衍生物与丙酮和醋酸乙烯酸乙烯酯的分子离子反应。异构体１，２的丙酮ＣＩ谱及其加合离子「Ｍ＋Ｈ＋Ａ」的ＣＩＤ谱都 可以区分该对异构体。化合物２，３和４可以和质子化丙酮及质子化二聚体发生加合反应，但化合物１仅能与质子化丙酮发生加合反应。在醋酸乙烯酯的ＣＩ谱中，观察到４个化合物的质子化二聚体，其中异构体１，２的质子化二聚体的ＣＩＤ谱也能反映它们立体结构的差异。

Differentiation of Cis-and Trans-Cyclopropane Derivative Isomers

The collision-induced dissociation (CID) spectra of the protonated molecule m/z169 of 1 and 2 compounds exhibit the differences. The differences between 1, 2 and 3, 4 compounds are observed in the acetone positive-ion chemical ionization (CI) mass spectra of four compounds. The adduct ions of 2, 3 and 4 compounds with the protonated acetone or the protonated acetone dimer are observed in their CI mass spectra, but the adduct ions of 1 compound with the protonated acetone only appear in its CI mass spectra. The low energy CID spectra of the adduct ions afford the stereoisomeric information of four com- pounds. The vinyl-acetic ester positive ion CI mass spectra of four compounds are obtained. Their proto- nated dimer was observed in vinyl-acetic ester positive-ion CI mass spectra of four compounds, and their low-energy CID spectra offer some stereoisomeric information of isomers 1 and 2.