Aldrin is a pesticide used to control soil insects such as termites, corn rootworm, wireworms, rice water weevil, and grasshoppers. It has been widely used to protect crops such as corn and potatoes, and has been effective to protect wooden structures from termites. Aldrin, along with Dieldrin, was discovered by Julius Hyman, and associates in 1948. It can be manufactured from the synthesis of hexachloro1,3cyclopentadiene with bicyclo[2.2.1]2,5heptadiene in a DielsAlder reaction. The final condensation reaction is usually performed at approximately 120 C and at atmospheric pressure. Excess bicycloheptadiene is removed by distillation. The final product is usually further purified by recrystallization.
Aldrin is banned in many countries, including Bulgaria, Ecuador, Finland, Hungary, Israel, Singapore, Switzerland and Turkey. Its use is severely restricted in many countries, including Argentina, Austria, Canada, Chile, the EU, Japan, New Zealand, the Philippines, USA, and Venezuela.