CALCULATIONS OF RATE COEFFICIENTS FOR THE CHEMICALLY ACTIVATED REACTIONS OF ACETYLENE WITH VINYLIC AND AROMATIC RADICALS

Semiempirical quantum mechanical AM1 calculations were performed for t he chemically activated reactions of acetylene with vinyl, 1-buten-3-y n-1-yl, 1,3-butadien-1-yl, phenyl, 1-ethynylphenyl, 2-naphthyl, and 4- phenanthryl radicals. The reaction rate coefficients were then calcula ted on the Rice-Ramsperger-Kassel-Marcus (RRKM) level of theory, using the AM1 molecular parameters corrected to reproduce available experim ental data. The results obtained support the hypothesis that reactions of multiring aromatic species are in principle similar to those of be nzene and phenyl. The calculated rate coefficients are tabulated for t he conditions of interest to combustion modeling.