Phosphate salts of AB-polybenzoxazole monomer

Details Phosphate salts of AB-polybenzoxazole monomer Phosphate salts of AB-polybenzoxazole monomer

1990-06-29

1991-11-26

Reamer, James H.

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

Organic compounds

Carboxylic acids and salts thereof

C07C22704

Patent

active

050683845

ABSTRACT:
AB-polybenzoxazole monomer, such as 3-amino-4-hydroxybenzoic acid, can be synthesized in high yields from a hydroxy-benzoic acid or related compound in a three-step process of (1) nitration, (2) hydrolysis of the ester, and (3) reduction of the nitro moiety. The monomer is conveniently recovered as a phosphate salt in high purity by precipitating and recrystallizing from a phosphoric acid solution.

REFERENCES:
patent: 3929864 (1975-12-01), Papenfuss
patent: 4835306 (1989-05-01), Lysenko
Iwakura et al., Chem Abst., vol. 68, #13589C (1968).

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