Abstract
The photolysis of diazomethane in the presence of
iso
butene 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 resets before this excess energy is lost, attacking the carbon hydrogen bonds and carbon carbon double bond in
iso
butene. The latter attack yields 1.1 -dimethyl
cyclo
Zopropane 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
iso
butene.
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