Process for the preparation of 1-benzoylamino-8-hydroxynaphthale

Details Process for the preparation of 1-benzoylamino-8-hydroxynaphthale Process for the preparation of 1-benzoylamino-8-hydroxynaphthale

1982-04-23

1984-01-17

Chan, Nicky

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C14342

Patent

active

044263333

ABSTRACT:
The invention relates to a process for the preparation of 1-benzoylamino-8-hydroxynaphthalene-4,6-disulphonic acid (benzoyl-K acid) by reacting 1-amino-8-hydroxynaphthalene-4,6-disulphonic acid (K acid) with benzoylating agents, according to which process mixtures of aminonaphtholdisulphonic acid isomers are used instead of pure K acid, which mixtures contain over 40% by weight of K acid, relative to the total amount of diazotizable compounds in the mixture of isomers, and in which no other single isomer has a proportion which exceeds 10% by weight of the total amount of diazotizable compounds in the mixture of isomers.

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