The autoxidation of six esters, neopentyl butanoate, 2, 2-dimethylpropanoate, 3, 3- dimethylbutanoate, 2, 2-dimethylbutanoate, 2-methylbutanoate and 1, 1-[2 H 2]-neopentyl butanoate, has been studied at 438 K. The reaction products were determined for each system and key reactions leading to the formation and further reactions of the primary products have been identified.