Method of making high purity substituted diphenyldisulfides

Details Method of making high purity substituted diphenyldisulfides Method of making high purity substituted diphenyldisulfides

1998-03-18

1999-12-07

Geist, Gary

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

Organic compounds

Sulfur containing

568 23, 568 24, 568 25, C07C32100

Patent

active

059986700

ABSTRACT:
Disclosed is a method of making a substituted diphenyldisulfide from a substituted thiophenol. A two phase reaction mixture is prepared which comprises a substituted thiophenol having the general formula ##STR1## hydrogen peroxide, water, an organic solvent, a basic salt that will give a pH between about 7 and about 10, and an optional flocculating agent. In the formula, R is selected from the group consisting of halogen, alkyl from C.sub.1 to C.sub.6, alkoxy from C.sub.1 to C.sub.6, or nitro. After the exothermic reaction is complete, the reaction mixture is cooled to crystallize the substituted diphenyldisulfide product. The symmetrical product precipitates preferentially over the unsymmetrical product, thereby enhancing the purity of the product over the purity of the starting material. Optionally, the organic solvent and the aqueous phase are recycled.

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