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US 4,375,562 AGranted
Process for the preparation of bis-(amino-phenyl)-disulphides
AssigneeBayer Aktiengesellschaft
InventorsHeinz U. Blank, Theodor Pfister, Rolf Putter
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Abstract
Process for the preparation of a bis-(amino-phenyl)-disulphide of the formula ##STR1## in which R represents hydrogen or halogen, which comprises contacting an amino-thiophenol of the formula ##STR2## or a salt thereof in which R has the abovementioned meaning with sulphur or a sulphur-donating substance in an aqueous dispersion at a temperature of 10.degree. to 120.degree. C. and a pH value of 3 to 9.
Claims10
Process for the preparation of a bis-(amino-phenyl)-disulphide of the formula ##STR6## in which R represents hydrogen or halogen,
- which consists essentially of contacting an amino-thiophenol of the formula ##STR7## or a salt thereof in which R has the above-mentioned meaning with sulphur or thiosulphate which donates sulphur in an aqueous dispersion at a temperature of 10.degree. to 120.degree. C. and a pH value of 3 to 9 employing a reaction mixture consisting essentially of said amino thiophenol or salt thereof, water and elemental sulphur or said thiosulphate.
Dependencies are inferred from the claim text.