Methylcyclopropane, from decomposition

The formation of cyclopropane as a minor primary product in the mercury photosensitized decomposition of propylene has been reported/ and the formation of methylcyclopropane from but-l-ene. (This may be evidence for the formation of some triplet propylene.)... 

For general or typical procedures for 1,1-dichlorocyclopropanes (from chloroform and base under phase-transfer catalysis conditions), see Houben-Weyl, Vol. E19b, p 1527 1,1-di-chloro-2-methylcyclopropane (from propene, chloroform, oxirane and tetraethylammonium bromide as a catalyst), see Houben-Weyl, Vol. 4/3, p 376 7,7-dichlorobicyclo[4.1.0]heptane (from chloroform and potassium /er -butoxide), see Houben-Weyl, Vol. 4/3, p 162 and Vol. 5/3, pp 977-978 (from thermal decomposition of sodium trichloroacetate and from ethyl trichloroacetate and sodium methoxide)," see Houben-Weyl, Vol. 4/3, pi62. 

The radical is generated by photolytic decomposition of di-/-butyl peroxide in methylcy-clopropane, a process that leads to selective abstraction of a methyl hydrogen from methylcyclopropane ... 

Bis-(bromomethy1)mercury converts various olefins into cyclopropanes in high yields the reactions seem less sensitive to steric effects than the Simmons-Smith procedure. Methylcyclopropanes have been obtained in far higher yields than those afforded by Simmons-Smith conditions (45-96%) from olefins and 1,1-diiodoethane in the presence of diethyl2 inc. Similarly, carbenoid (as opposed to carbene) decomposition of aryldiazomethanes in the presence of olefins, zinc halides, and lithium halides, yields cyclopropanes in 40-90% yield. ... 

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