Preparation of 4-alkoxy-2-hydroxybenzophenone-5-sulfonic acids

Details Preparation of 4-alkoxy-2-hydroxybenzophenone-5-sulfonic acids Preparation of 4-alkoxy-2-hydroxybenzophenone-5-sulfonic acids

1990-12-13

1991-12-10

Chan, Nicky

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

Organic compounds

Sulfonic acids or salts thereof

560255, 560 14, 558415, 558412, 558389, C07C30932

Patent

active

050720341

ABSTRACT:
4-alkoxy-2-hydroxybenzophenone-5-sulfonic acids of the general formula I ##STR1## where R.sup.1 is C.sub.1 -C.sub.20 -alkyl which is unsubstituted or substituted by halogen, cyanao, hydroxyl, C.sub.1 -C.sub.20 -alkoxy, C.sub.2 -C.sub.20 -alkoxycarbonyl, acyloxy and/or phenyl which is unsubstituted or substituted by C.sub.1 -c.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy and/or halogen, R.sup.2 and R.sup.3 independently of one another are each hydrogen, halogen, C.sub.1 -C.sub.12 -alkyl, C.sub.1 -C.sub.12 -alkoxy, C.sub.1 -C.sub.4 -haloalkyl, C.sub.3 -C.sub.8 -cycloalkyl, C.sub.4 -C.sub.12 -cycloalkylalkyl, cyano, hydroxyl or hydroxyethyl or are each phenoxy, C.sub.7 -C.sub.10 -phenalkyl or phenyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy and/or halogen, and R.sup.4 is hydrogen or sulfo, are prepared by reacting a 4-alkoxy-2-hydroxybenzophenone of the general formula II ##STR2## with chlorosulfonic acid at from -20.degree. to +100.degree. C., by a novel and improved process in which the reaction is carried out in an aliphatic, cycloaliphatic and/or aromatic carboxylate as solvent.

REFERENCES:
patent: 3468938 (1969-09-01), Cofrancesco et al.
patent: 3636077 (1972-01-01), Stauffer

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