The synthesis of a diverse series of novel insecticidally active carboxylic acid N'-benzoyl-N'-tert-butyl-N-(4-chlorobenzoyl)hydrazinocarbonyloxy methyl and ethyl esters as well as carboxylic acid N'-benzoyl-N'-tert-butyl-N-(4-chlorobenzoyl)hydrazino methyl esters are reported.