Continuous process for the preparation of sulfonylisocyanates

US5294741A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Gunter Schlegel · Liederbach, DE
• Stephen Lachhein · Hofheim, DE
• Harald Berger · Kelkheim, DE

Key dates

• Filing date: Feb 21, 1992
• Grant date: Mar 15, 1994
• Expiry date: Feb 21, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C311/65
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to an improved process for the preparation of a compound of the formula R.sup.1 -X-SO.sub.2 -NCO in which PA1 X is O or NR.sup.2, PA1 R.sup.1 is alkylsulfonyl or phenyl which is optionally substituted by Hal, alkyl and/or alkoxy, and PA1 R.sup.2 is alkyl, by reacting PA1 R.sup.1 XH with ClSO.sub.2 NCO to give the compound R.sup.1 XCONHSO.sub.2 Cl followed by a rearrangement reaction, which comprises carrying out the process continuously in the presence or absence of an inert solvent.