Process for the production of 2-stilbylnaphthotriazole optical b

Details Process for the production of 2-stilbylnaphthotriazole optical b Process for the production of 2-stilbylnaphthotriazole optical b

1987-01-20

1988-12-13

Daus, Donald G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

534579, 534582, 534689, 548257, C07D24924

Patent

active

047912111

ABSTRACT:
An improved process for the production of 2-stilbylnaphthotriazole optical bleaches which involves diazotizing aminostilbene 2-sulfonic acids, coupling the thus formed diazonium salt with naphthylamino-sulfonic acid to form the stilbylnaphthyl monoazo salt by adding the naphthylamino-sulfonic acid to the diazonium salt from the diazotization, neutralized to a pH in the range of 6-8, in the presence of 2-butoxyethanol, oxidizing said monoazo salt to form the 2-stilbylnaphthotriazole compounds with air in an aqueous alkaline medium containing butoxyethanol and isolating and recovering said 2-stilbylnaphotriazole optical bleaches as their sodium salts.

REFERENCES:
patent: 2784183 (1957-03-01), Keller
patent: 4167629 (1979-09-01), Fleck
patent: 4219472 (1980-08-01), Hurter

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