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Decompositions of o-methyl-, o-benzyl-, and o-phenylbenzoyl peroxides have been studied in carbon tetrachloride in the presence and absence of iodine and iodine plus water (Tables I-IV). In carbon tetrachloride alone, for the o-methyl compound the ratio of decarboxylation to intramolecular hydrogen transfer is 2.5 to 1. The radical derived from hydrogen transfer undergoes cross-termination with the trichloromethyl radical and like-termination. In the o-benzyl compound intramolecular