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The thermal decomposition of hpropenylcyclobutane has been investigated in the temperature range 304348°C; the decomposition was homogeneous and first order. Two parallel reactions took place, an isomerization to yield 1-methylcyclohexene and a decomposition to yield ethylene and isoprene. The ratio of products from each reaction path was essentially independent of temperature. The Arrhenius equations for these two reactions were found to be : k(isoprene) = 1014.64 exp (-5 l,030/RT) sec-1, k(1-methylcyclohexene) = 1014.53 exp (-51,03O/RT) sec-1.

A laser flash photolysis/laser absorption technique has been used to generate and monitor SiH2 radicals in real time. We present preliminary results of a study of the rate of removal of SiH2 radicals in the presence of D2 in the temperature interval 268-330 K. The removal rate coefficient is found to be temperature independent in this range with a value (1.88 ± 0.17) X 10"12 cm3 molecule"1 s'1. The implications of this result for the temperature dependence of the reaction of SiH2 with H2 are discussed.