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ChemicalBook CAS DataBase List ALPHA-HCH
319-84-6

ALPHA-HCH synthesis

5synthesis methods
Alpha-hexachlorocyclohexane (alpha-HCH)is produced as a byproduct during the commercial synthesis of lindane, an organochlorine insecticide. The production process involves the chlorination of benzene in the presence of ultraviolet light or a catalyst, leading to the formation of technical-grade hexachlorocyclohexane, a mixture of several isomers. This mixture typically contains 60–70% of the alpha isomer, along with the various other isomers. Since only the gamma-isomer (lindane) has significant insecticidal activity, it is separated and purified from the mixture, while the remaining isomers, including alpha-HCH, are considered waste or low-value byproducts.
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Yield:-

Reaction Conditions:

with chlorine

References:

Stewart;Hanson [Journal of the American Chemical Society,1931,vol. 53,p. 1121,1124, 1127]

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