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n :  a white crystalline persistent chlorinated hydrocarbon insecticide C12H8Cl6O
Diels, Otto Paul Hermann (1876-1954),
and Al*der, Kurt (1902-1958), German chemists. Diels and Alder made an important contribution to organic chemistry with their development of a method for synthesizing a ring of six carbon atoms. This is now known as the Diels-Alder reaction, from which aldrin and dieldrin are derived. In 1928 Diels and Alder published their first paper on the subject. The insecticides aldrin and dieldrin were first prepared by the method which is now widely used in the synthesis of organic compounds. Diels and Alder were awarded the Nobel Prize for Chemistry in 1950.

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