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Flow-vacuum pyrolysis of title compounds 7 and 8 was investigated at 1.33 mbar on a large temperature interval (500 o C-800 o C). The main reaction products of 7 were: anthracene, 9- methylanthracene, dibenzosuberone, 5H-dibenzo(a,d)cycloheptene and 5H-10,11-dihydro- dibenzo(a,d)cycloheptene. The pyrolysis products of 8 were: anthracene, 9-methyl-anthracene, phenanthrene, 5H-dibenzo(a,d)cycloheptene and 5-methylene-5H-dibenzo(a,d)cycloheptene. Radical mechanisms are proposed for rationalization of the formation of above products. A comparison of reaction routes in pyrolyses of the title alcohols is presented. The results are also compared with those of previously studied dynamic pyrolyses of related hydrocarbons and ketones.

Flow-vacuum pyrolysis of 5H-10,11-dihydro-dibenzo[a,d]-cyclohepten-5-ol and 5-hydroxymethyl-5H-dibenzo[a,d]-cycloheptene