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Mass spectra of substituted Δ 2 ‐1,2,4‐oxadiazolines. II
Author(s) -
De Albuquerque Julianna F. C.,
Srivastava R. M.
Publication year - 1981
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.5570180120
Subject(s) - chemistry , fragmentation (computing) , mass spectrum , metastability , ion , mass spectrometry , electron ionization , decomposition , spectral line , mass , analytical chemistry (journal) , computational chemistry , organic chemistry , chromatography , physics , astronomy , computer science , ionization , operating system
5,5‐Pentamethylene‐3‐(phenyl or para ‐substituted‐phenyl)‐Δ 2 ‐1,2,4‐oxadiazolines, 1a‐e , were examined by electron‐impact mass spectrometry. Defocussed metastable ion detections confirmed the formation of certain daughter fragments from the mother ions. The exact mass measurements helped to make the correct assignment of various species. We conclude that it is the spiro arrangement which caused such a dramatic change in the decomposition pattern. Several new fragmentation pathways have been found in the present studies. Out of five oxadiazolines prepared for the present work, three ( 1b,d,e ) are new.