Process for the preparation of asymmetrically substituted ureas, carbamates or thiocarbamates

US5248755A · kind A · utility

Assignee

• Chemie Linz Gesellschaft m.b.H. · AT

Inventors

• Martin Muller · Berlin, DE
• Gerhard Stern · Linz, AT
• Erich Schulz · Ansfelden, AT
• Markus Rossler · Linz, AT

Key dates

• Filing date: Oct 9, 1992
• Grant date: Sep 28, 1993
• Expiry date: Oct 9, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C333/04
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process for the preparation of asymmetrically substituted ureas, carbamates, thiocarbamates or substituted isocyanates by reaction of an adduct of isocyanic acid and a tertiary amine with a primary and secondary amine, an alcohol, a thiol or a compound having one or two non-cumulated olefinic double bonds, and a process for the preparation of N-mono- or N,N-disubstituted ureas by reaction of ammonium isocyanate with a primary or secondary amine in a diluent.