Process for the preparation of N-substituted imido-dicarboxylic acid diaryl esters

US4348331A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Karlfried Dickore · Leverkusen, DE
• Engelbert Kuhle · Wittlich, DE

Key dates

• Filing date: Feb 10, 1981
• Grant date: Sep 7, 1982
• Expiry date: Feb 10, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D309/04
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

This invention relates to a process for the preparation of N-substituted imido-dicarboxylic acid diaryl ester compound of the formula EQU R.sup.1 --N(CO--OR.sup.2).sub.2 (I) wherein PA1 R.sup.1 is an optionally substituted aliphatic, cycloaliphatic, araliphatic, aromatic or heterocyclic radical, and PA1 R.sup.2 is an optionally substituted aryl radical, which can be used as intermediates for the production of known herbicides, which process comprises reacting an amine salt of the formula EQU R.sup.1 --NH.sub.2.HX.sup.1 (II) wherein X.sup.1 is a halogen, with a carbonic acid aryl ester halide of the formula EQU R.sup.2 --O--CO--X.sup.2 (III) wherein X.sup.2 is halogen, at a temperature from 100.degree. C. to 300.degree. C.