FTIR spectroscopic study of the mechanism for the gas-phase reaction between ozone and tetramethylethylene

摘要: Long-path FTIR spectroscopic product studies were made of mixtures containing part-per-million concentrations O/sub 3/ and (CH/sub 3/)/sub 2/C double bonded C(CH/sub 2/ (TME) in 700 Torr 2/-N/sub to determine the formation reactions dimethyl-substituted Criegee intermediate 2/COO expected from + TME ..-->.. O. The observed stoichiometry, ..delta..-(TME)/..delta..(O/sub 3/), was typically 1.7, among products CO, CO/sub 2/, HCHO, CH/sub 3/OH, 3/OOH, 3/C(double O)OH, O)OOH, O, O)CHO, O)OCH/sub 3/, O)CH/sub 2/(OH), tentatively identified as 2/)/sub 2/C(OH)-C(CH/sub 2/OOH AND 2/(OOH). In addition, /sup 16/O- 18/O-labeled 18/O/sub 3/-TME-air mixtures, effects added 3/CHO, NO/sub (or 15/NO/sub 2/) on distribution determined. results indicate that ca. 25% moiety formed thermally stable, remainder largely dissociated yield following free radicals, i.e., 3/C(OOH)double bondedmore » HO. HO-initiated oxidation shown account for excess consumption over well some major observed.« less