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The dissimilarity between the electron‐impact and photochemical or thermal behaviour of some methyl cyclobut‐3‐ene‐1,2‐dicarboxylates and muconates
Author(s) -
Mandelbaum Asher,
Weinstein S.,
GilAv E.,
Leftin J. H.
Publication year - 1975
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.1210101006
Subject(s) - fragmentation (computing) , ene reaction , metastability , chemistry , electron ionization , photochemistry , deuterium , kinetic energy , thermal , electron , labelling , stereochemistry , organic chemistry , atomic physics , physics , thermodynamics , ion , biochemistry , quantum mechanics , computer science , ionization , operating system
Comparison of the mass spectral behaviour of the dimethyl esters of the epimeric ( cis ‐ and trans ‐) cyclobut‐3‐ene‐1,2‐dicarboxylic acids and the isomeric muconates ( cis , cis ‐, cis , trans ‐ and trans , trans ‐) and some substituted analogues shows that no correlation exists between the electron‐impact‐induced fragmentation and the predicted photochemical or thermal transformations in these systems. The comparison involved fragmentation patterns (supported by deuterium labelling), metastable transitions, and also kinetic energy release in the field free region.