Abstract
AbstractEthenol, 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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