Process to synthesize AB-PBO monomer and phosphate salts thereof

Details Process to synthesize AB-PBO monomer and phosphate salts thereof Process to synthesize AB-PBO monomer and phosphate salts thereof

1989-07-14

1990-09-25

Reamer, James H.

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

Organic compounds

Carboxylic acids and salts thereof

560 23, C07C22704

Patent

active

049594923

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: 4093646 (1978-06-01), Bamfield et al.
patent: 4764263 (1988-08-01), Gregory et al.
patent: 4835306 (1989-05-01), Lysenko
Imai et al., "Polybenzazoles", 83 Makromol. Chem. 179 (1965).
Auwers et al., "Ueber einege neue Oxyazokorper und Triphenodioxazinderivate", 30 Chem. Ber. 988, 991-92 (1987).
Kimura et al., Method for Manufacturing Aromatic Heterocyclic Block Copolymers, Japanese Patent Application 62-89760 (filed Apr. 14, 1987 and published Oct. 24, 1988) (translation attached).

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