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AB-PBO phosphate monomer, method for synthesizing the same, and method for synthesizing polybenzoxazole polymer
AB-PBO phosphate monomer, method for synthesizing the same, and method for synthesizing polybenzoxazole polymer
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机译:AB-PBO磷酸酯单体,其合成方法以及聚苯并恶唑聚合物的合成方法
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摘要
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.
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