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US4141892A Process for preparing p-[[p-(phenylazo)phenyl]azo]phenol 失效
制备p- {8 {对 - (苯基偶氮)苯基{9偶氮{9苯酚}的方法

Process for preparing p-[[p-(phenylazo)phenyl]azo]phenol
摘要:
A process for preparing the compound, or dye, ##STR1## by forming aminoazobenzene employing a slight excess of sodium nitrite in the diazotization of aniline and, without isolation, diazotizing the monoazo base and coupling the diazonium salt into phenol.
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