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US5280128A Process for the preparation of benzothioxanthene dyestuffs 失效
制备苯并噻吩染料的方法

Process for the preparation of benzothioxanthene dyestuffs
摘要:
The present invention relates to a process for the preparation of benzothioxanthene dyestuffs and cyclisation of 3-(2'-aminophenylthio)-benzanathrones wherein the diazotisation and cyclisation are carried out simultaneously in polar, aprotic solvent in the presence of water.
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