申请人:The Dow Chemical Company
公开号:US05453542A1
公开(公告)日:1995-09-26
The present invention is a method of preparing a 4,6-bisarylazoresorcinol comprising reacting an aryldiazonium salt and resorcinol in the presence of a base and a reaction medium containing water and a water-miscible solvent at a temperature in the range of about -5.degree. C to about -60.degree. C. The present invention is also a method of preparing a 2-substituted 4,6-bisarylazoresorcinol comprising reacting an aryldiazonium salt with a 2-substituted resorcinol. The 4,6-bisarylazoresorcinol or 2-substituted 4,6-bisarylazoresorcinol can then be hydrogenated to a 4,6-diaminoresorcinol, which is a precursor to polybisbenzoxazoles (PBOs), polymers which are useful as insulators, solar arrays, and tear-resistant gloves.
本发明涉及一种制备4,6-双芳基偶氮邻苯二酚的方法,包括在存在碱和含水和水溶性溶剂的反应介质中,将芳基重氮盐和邻苯二酚反应,在温度约-5°C至约-60°C的范围内进行。本发明还涉及一种制备2-取代的4,6-双芳基偶氮邻苯二酚的方法,包括将芳基重氮盐与2-取代邻苯二酚反应。然后,4,6-双芳基偶氮邻苯二酚或2-取代的4,6-双芳基偶氮邻苯二酚可以被氢化成4,6-二氨基邻苯二酚,这是聚双苯并噁唑(PBOs)的前体,这种聚合物可用作绝缘材料、太阳能阵列和耐撕裂手套。