Electron impact ionization of unstable enols: H2CCHOH, H2CC(OH)CH3 and H2CC(OH)C2H5

Muhammad Iraqi; Ilan Pri‐Bar; Chava Lifshitz

doi:10.1002/oms.1210211010

Electron impact ionization of unstable enols: H₂CCHOH, H₂CC(OH)CH₃ and H₂CC(OH)C₂H₅

Muhammad Iraqi, Ilan Pri‐Bar, Chava Lifshitz

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Abstract

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 CH₃ 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 [C₂H₅CO]⁺ and [CH₃CO]⁺ 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.

Original language	English
Pages (from-to)	661-664
Number of pages	4
Journal	Journal of Mass Spectrometry
Volume	21
Issue number	10
DOIs	https://doi.org/10.1002/oms.1210211010
State	Published - 1 Jan 1986
Externally published	Yes

ASJC Scopus subject areas

Biochemistry
Molecular Medicine
Instrumentation

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title = "Electron impact ionization of unstable enols: H2CCHOH, H2CC(OH)CH3 and H2CC(OH)C2H5",

abstract = "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 CH3 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 [C2H5CO]+ and [CH3CO]+ 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.",

author = "Muhammad Iraqi and Ilan Pri‐Bar and Chava Lifshitz",

year = "1986",

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doi = "10.1002/oms.1210211010",

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T1 - Electron impact ionization of unstable enols

T2 - H2CCHOH, H2CC(OH)CH3 and H2CC(OH)C2H5

AU - Iraqi, Muhammad

AU - Pri‐Bar, Ilan

AU - Lifshitz, Chava

PY - 1986/1/1

Y1 - 1986/1/1

N2 - 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 CH3 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 [C2H5CO]+ and [CH3CO]+ 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.

AB - 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 CH3 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 [C2H5CO]+ and [CH3CO]+ 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.

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Electron impact ionization of unstable enols: H₂CCHOH, H₂CC(OH)CH₃ and H₂CC(OH)C₂H₅

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