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Abstract : |
Free radicals generated from a number of olefinic, acetylenic, and vinyl monomers in the presence of sulphur dioxide and tert-butyl hydroperoxide were investigated. In all reaction systems a sulphonyl propagating radical first appears which depropagates into the corresponding carbon radical at higher temperatures. The sulphonyl radicals were observed between -119 and -44-degrees-C, whereas the carbon radicals were observed from -63 to -1-degrees-C. The order of decreasing reactivity of the reaction system was: 3-hexyne > 1-heptene > methyl acrylate > acrylonitrile > 1-heptyne., |
