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Electron impact and chemical ionization mass spectra of alkyldiphenylphosphine oxides
Author(s) -
Goff Susan D.,
Jelus Barbara L.,
Schweizer Edward E.
Publication year - 1977
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.1210120110
Subject(s) - isobutane , electron ionization , mass spectrum , ion , chemistry , chemical ionization , analytical chemistry (journal) , ionization , spectral line , mass spectrometry , proton , reagent , polyatomic ion , methane , medicinal chemistry , organic chemistry , physics , catalysis , chromatography , quantum mechanics , astronomy
In the 70 e V electron impact mass spectra of a series of alkyldiphenylphosphine oxides (Rϕ 2 PO, R = Me, Et, n ‐Pr, i‐Pr, n ‐Bu, i‐Bu, t ‐Bu, neopentyl, n ‐decyl), molecular ions of low abundance are observed and [M + H] + ions are formed to a small extent at high sample pressures. The major ions include [ϕ 2 PO] + , [ϕ 2 POH] + ; [ϕ 2 CH 2 PO] + and [ϕ 2 CH 2 POH] + which are formed by rearrangement and cleavage processes. The chemical ionization mass spectra obtained with methane and isobutane reagents consist of [M + H] + ions. The proton affinity of Rϕ 2 PO was found to be 219 ± 2.5 kcal mol −1 .
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