Effects of competitive hydrogen halide elimination on CO production from the reaction of O(3P) atoms with propargyl chloride and bromide

G. T. Fujimoto*, M. E. Umstead, Ming-Chang Lin

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

The production of CO from the reaction of O(3P) atoms with propargyl chloride and bromide has been measured and compared with that formed in the analogous reaction involving methylacetylene. A cw CO laser was used to probe the absolute concentration and vibrational energy content of the CO. These results show that CO molecules formed in these three reactions contain essentially the same amount of vibrational energy, having a Boltzmann temperature of about 2400 ± 100 K. The rates of CO production in these reactions, however, differ considerably and have the following relative rates: methylacetylene: propargyl chloride: propargyl bromide = 1 : 0.25 : 0.12. These data suggest the possible simultaneous occurrence of other parallel channels, presumably, HX-elimination from the excited ketene intermediates via the following four-centered mechanism, viz., (Figure presented.) where X = Cl, Br. The elimination product, C3H2O, is believed to be too stable to generate a CO molecule subsequently and thus reduces the rate of CO formation in these two cases.

Original languageEnglish
Pages (from-to)399-403
Number of pages5
JournalChemical Physics
Volume51
Issue number3
DOIs
StatePublished - 1 Jan 1980

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