US 5,278,291 A · Hydroxyethylthio hydroxyethylamino-phenyl-azo and -azoxy dyestuffs

Abstract

A process for the preparation of the sulphone of the formula ##STR1## consists in reductive cleavage of azo/azoxy dyestuffs of the formula ##STR2## where D is a radical of a diazo component from the benzene or naphthalene series. The invention also relates to the azo/azoxy dyestuffs mentioned.

Claims6

Dependent claims

Azo dyestuff of the formula ##STR36## in which D is the radical of a benzene or naphthalene diazo component that is unsubstituted or substituted by Cl, C.sub.1 -C.sub.4 -alkyl, carboxyl, alkylsulphonyl, or sulpho.

Dependencies are inferred from the claim text.

Facts

Application

07/959,188Filed 9 Oct 1992 · continuation in part

Priority

DE 39399662 Dec 1989

Granted

11 Jan 1994

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

C09B 29/0813
Further substituted alkylamino, alkenylamino, alkynylamino, cycloalkylamino aralkylamino or arylamino: substituted by OH, O-C-R, O-C-X-R, O-R
C07C 315/04
Preparation of sulfones; Preparation of sulfoxides: by reactions not involving the formation of sulfone or sulfoxide groups
C07C 317/36
Having sulfone or sulfoxide groups and amino groups bound to carbon atoms of six-membered aromatic rings being part of the same non-condensed…
C09B 43/06
Preparation of azo dyes from other azo compounds: by oxidation

Abstract

Claims6

Dependent claims

Dependencies are inferred from the claim text.

Hydroxyethylthio hydroxyethylamino-phenyl-azo and -azoxy dyestuffs

Life of this patent

Abstract

Claims6

Hydroxyethylthio hydroxyethylamino-phenyl-azo and -azoxy dyestuffs

Life of this patent

Abstract

Claims6