Hexachlorooctahydronaphthalene type

Hexachlorooctahydronaphthalene type (e.g., Aldrin, Dieldrin, Endrin, Endrin ketone, and Endrin aldehyde)... 

Among the hexachlorooctahydronaphthalene type compounds, aldrin [309-00-2] was one of the earliest pesticides. It was first synthesized in the United States in 1948. It was produced by Diels-Alder reaction from acetylene and hexachlorocyclopenta-diene. Aldrin readily converts into dieldrin [60- 57-1] on exposure to sunlight or bac-terias. Both aldrin and dieldrin were widely used from 1950 to 1970 for protecting com and cotton crops. They were also used to protect citrus plants and combat soil pests and locust and in the preservation of timber. Because of their high toxicity and hazard to human health, the production of these pesticides ceased in the United States in 1974. After 1974, the uses of these pesticides were limited to control termites. All uses of these... 

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