Process for the preparation of sulphonic acid chlorides

Details Process for the preparation of sulphonic acid chlorides Process for the preparation of sulphonic acid chlorides

1978-09-08

1980-07-29

Killos, Paul J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C14326

Patent

active

042150710

ABSTRACT:
An improvement in a process for the preparation of the sulphonic acid chloride of the formula ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are identical or different and denote hydrogen, a lower alkyl or cycloalkyl radical, halogen, nitro, aryl, aralkyl, aryl ether or a radical ##STR2## or wherein adjacent radicals R.sup.1 and R.sup.2 are linked to form a cycloaliphatic or aromatic carbocylic ring which is optionally substituted by a sulphonic acid chloride group by contacting a sulphonic acid of the formula ##STR3## wherein R.sup.1, R.sup.2 and R.sup.3 have the abovementioned meanings, with phosgene in the presence of a N,N-dialkylcarboxylic acid amide catalyst, the improvement wherein the process is carried out in the presence of a sulphonating agent.

REFERENCES:
patent: 3706794 (1972-12-01), Horner
patent: 3795705 (1974-03-01), Chan
patent: 4105692 (1978-08-01), Blank
Groggins, "Unit Processes in Organic Synthesis", p. 224, (4th ed., 1952).

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