Dieldrin is a chlorinated hydrocarbon originally produced in 1948 by J. Hyman &amp; Co, Denver, as an insecticide. Dieldrin is closely related to aldrin. Aldrin reacts further to form dieldrin. Aldrin is not toxic to insects; it is oxidized 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 norbornadiene and hexachlorocyclopentadiene.
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