Abstract
Small gas-phase vanadium clusters synthesized in a molecular beam system by a laser vaporization technique are reacted with 1-bromopropene, 3-bromopropene, 3-chloropropene, and propene in a fast-flow reactor, and the analysis of the products was made by laser ionization-time-of-flight mass spectrometry. The results observed can be explained in terms of three different mechanisms for the reaction of halopropene: halogen abstraction, halogen substitution followed by molecular hydrogen evaporation, and molecular addition followed by evaporation of molecular hydrogen and hydrogen halide. The addition reaction followed by molecular hydrogen evaporation can account for the reaction involving propene. The dependence of the relative importance of the three different mechanisms on the vanadium cluster size and the structure of the halopropene is discussed.
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