THERMAL-DECOMPOSITION OF 1-CYCLOHEXYL-1-METHYLETHYL PEROXYPIVALATE

The thermal decomposition of a novel peroxyester, 1-cyclohexyl-1-methy lethyl peroxypivalate 1a in cumene has been studied using the radical trapping technique employing 1,1,3,3-tetramethyl-2, 3-dihydro-1H-isoin dol-2-yloxyl T, a stable aminoxyl radical, as the scavenger. Comparabl e amounts of cyclohexyl radicals and t-butyl radicals were generated f rom the thermolysis of 1a. Thus, 1-cyclohexyl-1-methylethoxyl radicals 2a undergo beta-scission exclusively. The efficiency of radical gener ation for la was determined to be 0.56, which is slightly higher than that for t-butyl peroxypivalate (0.53).