糖基原酸酯的电子撞击离解质谱

Electron Impact Mass Spectra of Sugar Orthoesters

本文对己糖基原酸酯在２０ｅＶ的电子撞击离解质谱进行了详细的分析．作者观察到３，４，６－三－Ｏ一乙酰基－Ｄ－吡喃型己糖－１，２－原乙酸甲酯或原乙酸乙酯的主要裂解途径，都是首先生成２，３，４，６－四－Ｏ－乙酰基－Ｄ－吡喃型己糖甲基苷离子或乙基苷离子，然后再进一步碎裂．３，４，６－三－Ｏ０苄基－β－Ｄ－吡喃型甘露糖和３，４，６，－三－乙酰基衍生物则另有不同的碎裂方式．这些现象在以往的文献中均未见报道过．

n this article, the authors report the electron impact mass spectrometric analysis of six structurally related derivatives of 3, 4, 6-tri- O-acetyl or benzyl-β-D-mannopyranose 1,2-(methyl orthoacetate) (1～2 ), and3, 4, 6-tri-O-acetyl-o-acetyl-α-D-glucopyranose 1,2-metyyl or cthylorthoaeetate ) (3～6 ). It was found that the massspectra of 1～6 are much complicated because of the valietips of ismerizations and rearrangements that co-curred during the fragmentation process.