Reactions of vibrationally excited molecules. I. The reaction of methylene with iso butene

Abstract
The photolysis of diazomethane in the presence of isobutene has been investigated. The results obtained are explained on the basis that the methylene initially produced may be vibrationally excited, to an extent which depends on the wavelength of the radiation employed in the photolysis, and may also contain considerable kinetic energy. The methylene reacts before this excess energy is lost, attacking the carbon hydrogen bonds and carbon carbon double bond in isobutene. The latter attack yields 1.1-dimethylcyclopropane which contains sufficient energy to isomerize, and does so, unless stabilized by collision. The results obtained are compared with those published for the photolysis of keten in the presence of isobutene.

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