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The non-ester pyrethroidal insecticide ethofenprox (MTI-500) [2-(4-ethoxyphenyl)-2methylpropyl 3-phenoxybenzyl ether] was more photostable than ester pyrethroids such as allethrin when irradiated under a UV lamp. Under laboratory conditions, it was oxidized at the benzyl carbon atom of the ether when irradiated with UV light in the presence of oxygen, to form an ester, 2-(4-ethoxyphenyl)-2-methylpropyl 3-phenoxybenzoate, as the major photoproduct. The ester product had no insecticidal toxicitydoi:10.1584/jpestics.15.405 fatcat:f5crkydo2nafnjbhccivag4jdi