7-アザベンゾノルボルナジエン類の質量スペクトル

抄録

The EI mass spectral fragmentation of four 7-azabenzonorbornadiene derivatives was investigated. Fragmentation processes are proposed on the basis of accurate mass measurements and B/E constant linked scannings. Three major fragmentation pathways, i.e., 1) retro-Diels-Alder reactions resulting in the loss of acetylene, 2) cheletropic reactions giving naphthalene derivatives, and 3) rearrangements to quadricyclene derivatives followed by ring cleavage giving N-alkyl nitrile cations, were deduced.