Conclusions
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1.
The primary products of vacuum pyrolysis of tetrafluoroethylene, hexafluoropropene, pentafluoro-2-chloropropene, octafluoroisobutene, octafluorobutene-1, octafluorobutene-2, and perfluoro-2,3-dimethylbutene were studied by mass spectrometry.
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2.
The coincidence of the basic fragmentary ions in the mass spectra of perfluoropropene, pentafluoro-2-chloropropene, perfluorobutenes, and perfluoro-2,3-dimethylbutene with the primary products of their vacuum pyrolysis indicates the absence of rearrangements of the molecular radical cations contained as substituents at the double bond of the F atom or CF3 group and permits predicting the primary act of thermal decomposition of perfluoroolefins with the mass spectra obtained with a low ionizing voltage.
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3.
The fragmentation changes in the low-energy mass spectra of hexafluoropropene, pentafluoro-2-chloropropene, and perfluoroisobutene confirmed that not olefin-carbene isomerization, but their decomposition, which takes place with the possible participation of 1,3-biradicals, is the predominant process with an increase in the temperature in conditions of vacuum pyrolysis.
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Deceased.
Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 46–53, January, 1989.
We would like to thank S. A. Postov and S. D. Chepik for providing the samples of the organofluorine compounds.
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Kagramanov, N.D., Zuev, P.S., Kutin, A.A. et al. Mass spectrometric study of vacuum pyrolysis of perfluoroolefins. Russ Chem Bull 38, 37–42 (1989). https://doi.org/10.1007/BF00953695
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DOI: https://doi.org/10.1007/BF00953695