Method of preparing tetrahalobenzene

Details Method of preparing tetrahalobenzene Method of preparing tetrahalobenzene

C - Chemistry, Metallurgy

07

C

204/52.3, 260/59

C07C 25/02 (2006.01) C07C 17/00 (2006.01) C25B 3/04 (2006.01)

Patent

CA 1228603

22 ABSTRACT METHOD OF PREPARING TETRAHALOBENZENE Tetrahalobenzene compounds of the formula (I): Image (I) in which X is independently chloro or, preferably, fluoro and Y is hydrogen or -N+R3A- in which each R is independently C1-4 alkyl and A is a radical capable of forming an anion A-, are prepared by (a) alkylating a compound of formula (II): Image (II) 23 or a salt thereof, to form a compound of formula (III): Image (III) (b) treating the compound of formula (III) with a quaternizing agent of formula RA to form a compound of formula (IV): Image (IV) and (c) partially or completely reductively cleaving the compound of formula (IV) to replace one or both -N+R3A- groups by hydrogen. Compounds (I), in which Y is -N+R3A-, (III) and (IV) are novel. Compound (I) is useful in the synthesis of insecticides.

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