Process for the preparation of asymmetrically substituted ureas, carbamates, thiocarbamates and substituted isocyanates

US5481035A · kind A · utility

Assignee

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

Inventors

• Martin Mullner · Traun, AT
• Gerhard Stern · Linz, AT
• Markus Rossler · Linz, AT

Key dates

• Filing date: Jul 6, 1993
• Grant date: Jan 2, 1996
• Expiry date: Jul 6, 2013

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 isocyanates with a primary or secondary amine in a diluent.