［2，3＇－联－1H－吲哚］－3（2H）－酮衍生物的电子轰击质谱研究

A Study on the Electron Impact Mass Spectra of [2,3'-Bi-1H-indol]-3(2H)-ones

本文报道了５种［２，３＇－联－１Ｈ－吲哚］－３（２Ｈ）－酮团衍生物（１－５）的电子轰击质谱．发现其质谱裂解方式与标题物分子中１一位氮原子的取代类型有失其中，当Ｒ１＝Ｈ时，分子离子按β消除机理开裂为吲哚（Ａ）和吲哚酮（Ｂ）的分子离子．而当Ｒ１＝Ｍｅ时，分子离子易于丢失ＭｅＮ或２位苯基给出稳定的碎片离子Ｆ和Ｇ．

n this paper,the electron impact mass spectra of five[2,3'-bi-1H-indol] 3(2H)ones(1-5) were reported.It was found that the fragmentaion mode of the title compounds depended entirely upon the substitution type on their 1-position nitrogen atom.Thus,the molecular ions of compounds 1 and 2(R1=H) cleavaged exclusively into molecular ions of the corresponding indole(A) and indolone(B) via β- elimination mechanism,whereas the molecular ions of compounds 3-5 (R1=Me) lost MeN or 2 -positon phenyl group leading to stable bogment ions F and G reSpectively.