Process

Details Process Process

1998-04-23

2000-02-29

Geist, Gary

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

Organic compounds

Sulfonic acids or salts thereof

562 74, 562 83, 560 14, 560 64, 560 65, C07C30302, C07C 6976

Patent

active

060311266

ABSTRACT:
A process for the production of a fluorescent whitening agent of formula: ##STR1## in which X and Z are as defined herein, comprising A) rearranging a hydrazobenzene compound having the formula: ##STR2## in which Z is as defined herein, to produce in situ a compound having the formula: ##STR3## B) diazotising the compound of formula (3) to produce a compound having the formula: ##STR4## in which Z has its previous significance and G.sub.1 is a counter ion; and C) reacting the compound of formula (4) with 2 moles of a compound having the formula: ##STR5## in which X and n have their previous significance, in the presence of an inorganic or organic palladium salt, or a mixture thereof, as catalyst-precursor, to produce a compound having the formula (1).

REFERENCES:
patent: 3984399 (1976-10-01), Weber et al.
patent: 4564479 (1986-01-01), Spencer
patent: 5208376 (1993-05-01), Habig et al.
patent: 5231223 (1993-07-01), Bader et al.
Chem. Abstr. 73:87625 for CS 133236.
Chem. Abstr. 116:105822 for HU 56535.
J. Chem. Soc., Perkin Transactions 1, No. 3, Feb. 7, 1998, p. 407-410.

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