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The mass spectra of isomeric hydrocarbons—I: Norbornene and nortricyclene; The mechanisms and energetics of their fragmentations
Author(s) -
Holmes J. L.,
McGillivray D.
Publication year - 1971
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.1210051202
Subject(s) - chemistry , energetics , fragmentation (computing) , norbornene , metastability , ion , mass spectrum , deuterium , standard enthalpy of formation , mass spectrometry , spectral line , computational chemistry , organic chemistry , atomic physics , physics , chromatography , thermodynamics , polymerization , polymer , astronomy , computer science , operating system
The mass spectra of norbornene, nortricyclene and deuterium labeled derivatives thereof have been studied. The appearance potentials of the ions [C 7 H 10 ] +· , [C 7 H 9 ] + , [C 6 H 7 ] + and [C 5 H 6 ] +· have been determined for both compounds and heats of formation of the hydrocarbons have been estimated. Detailed fragmentation schemes are proposed for the molecular ions and it is concluded that they dissociate by essentially different mechanisms which do not involve common intermediates. The structures and energy contents of the primary fragment ions are discussed in detail by comparing energetics, labeling experiments and metastable ion abundances.