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Electron impact ionization of unstable enols: H 2 CCHOH, H 2 CC(OH)CH 3 and H 2 CC(OH)C 2 H 5
Author(s) -
Iraqi Muhammad,
PriBar Ilan,
Lifshitz Chava
Publication year - 1986
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.1210211010
Subject(s) - electron ionization , ionization , chemistry , metastability , fragmentation (computing) , ion , mass spectrum , kinetic energy , radical , mass spectrometry , analytical chemistry (journal) , ionization energy , molecule , physics , organic chemistry , chromatography , quantum mechanics , computer science , operating system
Ethenol, 2‐hydroxypropene and 2‐hydroxybutene‐1 were prepared by low‐pressure pyrolysis of cyclobutanol, 1‐methylcyclobutanol and 1‐ethylcyclobutanol, respectively. Mass spectra, ionization energies, appearance energies of metastable ions and kinetic energy releases were determined on a reverse Nier‐Johnson double‐focusing mass spectrometer. Mercury and CH 3 radicals from the pyrolysis of dimethylmercury were employed for calibration of the energy scale. The ionization energy of 2‐hydroxybutene‐1 is 8.55 ± 0.1 eV and the appearance energies of [C 2 H 5 CO] + and [CH 3 CO] + from that molecule are 10.25 ± 0.1 and 10.40 ± 0.1 eV, respectively. Changes observed in metastable peak shapes for certain fragmentation reactions upon pyrolysis are discussed.