High purity process for the preparation of 4,6-diamino-1,3-benze

Details High purity process for the preparation of 4,6-diamino-1,3-benze High purity process for the preparation of 4,6-diamino-1,3-benze

1986-10-30

1988-08-23

Raymond, Richard L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

564443, 568709, 568711, C07C 8511

Patent

active

047662441

ABSTRACT:
High purity 4,6-dinitro-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 produced, (b) contacting the 1,2,3-trihalo-4,6-dinitrobenzene 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-diamino-1,3-benzenediol is useful in the preparation of high molecular weight polybenzoxazoles.

REFERENCES:
patent: 4005143 (1977-01-01), Bohm et al.
Wolfe, J. F. et al., Macromolecules, vol. 14, No. 4, pp. 909-914, (1981).

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