Patent · US Expired

Preparation of acyloxybenzenesulfonic acids and their alkali metal and alkaline earth metal salts

US4695412A · kind A · utility

5Cited by

6References

9Claims

0Family size

Assignee

BASF SE

Inventors

Wolf-Dieter Balzer · Ludwigshafen, DE
Hans-Heinrich Bechtolsheimer · Dittelsheim-Heßloch, DE
Karl-Heinz Beyer · Bischofswerda, DE
Rolf Fikentscher · Ludwigshafen, DE
Johannes Perner · Neustadt, DE
Rudi Widder · Leimen, DE
Helmut Wolf · Holzkirchen, DE

Key dates

Filing date	Nov 19, 1986
Grant date	Sep 22, 1987
Priority date	—
Expiry date	Nov 19, 2006

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C309/00
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Acyloxybenzenesulfonic acids and their alkali metal and alkaline earth metal salts are prepared by a process comprising sulfonation of a phenyl ester in the presence or absence of a small amount of a complexing agent for the sulfonating agent SO.sub.3 or chlorosulfonic acid, subsequent acylation and, if desired, neutralization to give the alkali metal or alkaline earth metal salt, and, if required, subjecting the latter to oxidative bleaching before drying.

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