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Ortho effects in organic molecules on electron impact: 18—Novel hydrogen transfer from the methoxy group to acetylenic carbon in 2‐methoxyphenylacetylene and 2‐methoxydiphenylacetylenes
Author(s) -
Ramana D. V.,
Rama Krish. V. S.
Publication year - 1989
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.1210240505
Subject(s) - chemistry , electron ionization , mass spectrum , carbon fibers , ion , molecule , hydrogen , electron transfer , spectral line , group (periodic table) , decomposition , kinetic energy , polyatomic ion , photochemistry , computational chemistry , organic chemistry , materials science , ionization , physics , astronomy , composite number , composite material , quantum mechanics
The transfer of a hydrogen from the ortho methoxy group to the acetylenic carbon in 2‐methoxyphenylacetylene under electron impact conditions affords the rearranged molecular ion corresponding to 2 H ‐1‐benzopyran. Similar processes leading to cyclic products are also noticed in 2‐methoxydiphenylacetylenes. The ion structures and the mechanism of fragmentations are established through high‐resolution data, collision‐induced decomposition, mass‐analysed ion kinetic energy spectra, B/E linked scan spectra, D‐labelling and chemical substitution.