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Kinetic studies in mass spectrometry–VII: Competing cleavage and rearrangement processes in molecular ion decomposition reactions
Author(s) -
Brown Peter
Publication year - 1970
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210030906
Subject(s) - chemistry , anisole , ion , butyrophenone , electron ionization , polyatomic ion , mass spectrometry , metastability , ether , nitrobenzene , medicinal chemistry , analytical chemistry (journal) , ionization , organic chemistry , catalysis , chromatography , neuroscience , dopamine , haloperidol , biology
Abstract Apparently competing cleavage and rearrangement reactions in a series of molecular ions have been studied by ionization and appearance potential methods, and by determination of the electron energy dependence of both normal and metastable daughter ion peak intensities. The processes investigated were (i) [M CH 3 ] vs. [M CH 2 O] in anisole; (ii) [M OC 6 H 5 ] vs. [M CO] in phenyl ether; (iii) [M NO 2 ] vs. [M NO] in nitrobenzene; (iv) [M C 3 H 7 ] vs. [M C 2 H 4 ] in butyrophenone: (v) [M C 3 H 7 ] vs. [M C 3 H 6 ] in n ‐butylbenzene; (vi) [M CH 2 OH] vs. [M CH 2 O] in 2‐phenylethanol; (vii) [M CH 3 CO 2 ] vs. [M CH 2 CO] in benzyl acetate; and (viii) [M C 4 H 9 O] vs. [M C 4 H 7 ] in n ‐butylbenzoate. The results are interpreted in terms of k vs. E curves with very different frequency factors for the two reaction types. Appearance potentials of metastable ions for the rearrangement reactions have also been measured.