Patent · US Expired

Process for the manufacture of aromatic sulfonic acid halides

US3947512A · kind A · utility

3Cited by

1References

2Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Kurt Gengnagel
Theodor Papenfuhs · Frankfurt, DE
Manfred Zimmermann · Monheim, DE

Key dates

Filing date	Feb 20, 1974
Grant date	Mar 30, 1976
Priority date	—
Expiry date	Feb 20, 1994

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C303/02
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

An improved process for the manufacture of aromatic sulfonic acid halides from aromatic diazonium compounds, wherein aromatic diazonium compounds are reacted in a strongly hydrochloric or hydrobromic solution in the presence of copper or copper compounds with an alkali metal hydrogeno-sulfite, which avoids the use of liquid or gaseous sulfur dioxide and of organic solvents according to known processes which makes the process, if carried out on a technical scale, expensive and strongly contaminates the waste water.

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