The kinetics and mechanism of pyrolysis of the title compound in the gas phase have been investigated. The kinetic results are consistent with the formation of dimethylsilanone by a radical process, followed by silanone insertion reactions. Some general conclusions are drawn about the mechanism of cyclization of dimethylsilanone and about the kinetics of pyrolysis of bicyclo epoxides.
Pyrolysis of the title compound to give ethene and a silabutadiene has the same Arrhenius parameters as pyrolysis of 1 ,I -dimethyl-I -silacyclobutane, whence the allylic stabilisation in a vinyl silyl radical is estimated to be ~2 9 kJ mol-1; some comments are also made on the stability of silabutadienes.Recently there have been two independent studies on silabutadienes, CH,=Si(R)-CH=CH,, which extend our knowledge of currently interesting sila-alkene intermediates. From pyrolysis and electron-impact experiments on 1-methyl-lvinyl-1 -silacyclobutane (MVS) Auner and Grobel inferred that it gave 2-methyl-2-silabuta-1,3-diene (MSB), which both dimerised and isomerised. Having detected allene as a product, they suggested that the isomerisation was to a siliran [reaction (l)]. Bertrand et aE.2 studied the decomposition of vinyl-
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