| Section2 = | Section7 = }} Dieldrin is a chlorinated hydrocarbon originally produced in 1948 by J. Hyman & Co, Denver, as an insecticide. The molecule has a ring structure based on naphthalene. Dieldrin is closely related to aldrin which itself breaks down to form dieldrin. Aldrin isn't toxic to insects, it's oxidised in the insect to form dieldrin which is the active compound. Both dieldrin and aldrin are named after the Diels-Alder reaction which is used to form aldrin from a mixture of nor… (More on Dieldrin)