Patent · US Expired

Preparation of 4,4' dichlorodiphenyl sulfone

US4871876A · kind A · utility

4Cited by

4References

8Claims

0Family size

Assignee

Dresser Industries, Inc. · US

Inventors

Gerhard Schaefer · Heidelberg, DE
Peter Neumann · Wiesloch, DE

Key dates

Filing date	Jan 25, 1988
Grant date	Oct 3, 1989
Priority date	—
Expiry date	Jan 25, 2008

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C315/00
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for the preparation of 4,4-dichlorodiphenyl sulfone by heating a mixture of (a) chlorobenzene, (b) chlorosulfonic acid or sulfur trioxide, and (c) thionyl chloride or phosgene to temperatures up to 220.degree. C., more than the stoichiometric amount (based on the amount of chlorobenzene) of chlorosulfonic acid or sulfur trioxide and less than the stoichiometric amount of thionyl chloride or phosgene being employed.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.