High purity process for the preparation of 4,6-...

Details High purity process for the preparation of 4,6-... High purity process for the preparation of 4,6-...

C - Chemistry, Metallurgy

07

C

260/598

C07C 213/00 (2006.01) C07C 201/12 (2006.01) C07C 205/12 (2006.01) C07C 205/26 (2006.01) C07C 213/02 (2006.01) C07C 215/80 (2006.01) C08G 73/22 (2006.01)

Patent

CA 1281742

ABSTRACT High purity 4,6-diamino-1,3-benzenediol is prepared by (a) contacting a 1,2,3-trihalobenzene with a nitrating agent and an acid under reaction conditions such that a 1,2,3-trihalo-4,6-dinitrobenzene is pro- duced, (b) contacting the 1,2,3-trihalo-4,6-dinitro- benzene prepared in (a) with an alkanol and a base under reaction conditions such that a 4,6-dinitro-2- -halo-1,3-benzenediol is produced, and (c) contacting the 4,6-dinitro-2-halo-1,3-benzenediol prepared in (b) with a hydrogenating agent in the presence of a solvent and a catalyst under reaction conditions such that a 4,6-diamino-1,3-benzenediol is produced. This 4,6-di- amino-1,3-benzenediol is useful in the preparation of high molecular weight polybenzoxazoles.

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