Manufacturing process for a naphthotriazole stilbene fluorescent

Details Manufacturing process for a naphthotriazole stilbene fluorescent Manufacturing process for a naphthotriazole stilbene fluorescent

1989-10-19

1991-04-09

Daus, Donald G.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D24924

Patent

active

050066625

ABSTRACT:
2-(stilbyl-4")-(naphtho-1',2':4,5)-1,2,3-triazole-2"-sulfonic acid is obtained by diazotizing p-aminostilbene sulfonic acid, coupling the resulting diazonium salt with Tobias acid and then oxidizing the resulting monoazo sodium salt to close the ring and form the naphthotriazolyl moiety, and, more particularly, by performing the ring-closure oxidation step in a solution of the monoazo compound in a mixture of 2-butoxyethanol and water with pressurized air by contacting said solution in the presence of a copper salt catalyst at temperatures in the range 105.degree.-160.degree. C. and at pressures in the range 10-80 psig, for a time sufficient to effect ring-closure.

REFERENCES:
patent: 3757011 (1973-09-01), Fleck
patent: 4791211 (1988-12-01), Lund

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