Process to synthesize ab-pbo monomer and phosphate salts...

Details Process to synthesize ab-pbo monomer and phosphate salts... Process to synthesize ab-pbo monomer and phosphate salts...

C - Chemistry, Metallurgy

08

G

402/171, 260/512

C08G 73/22 (2006.01) C07C 227/06 (2006.01) C07C 229/64 (2006.01)

Patent

CA 2021159

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. The monomer may be polymerized in high concentrations in polyphosphoric acid containing high levels of P2O5 to yield a high molecular weight polymer wihout dehydrohalogenation.

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