Preparation of 1,2,4-triazolium salts and 1,2,4-triazolines

US5840894A · kind A · utility

Assignee

• BASF SE

Inventors

• Regina Schneider
• Johann-Peter Melder · Schifferstadt, DE
• Joaquim Henrique Teles · Waldsee, DE
• Carsten Groning · Mannheim, DE
• Klaus Ebel · Lampertheim, DE

Key dates

• Filing date: Jun 21, 1996
• Grant date: Nov 24, 1998
• Expiry date: Jun 21, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D249/12
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of 1,2,4-triazolium salts Ia ##STR1## where R.sup.1, and R.sup.2 and R.sup.3 are C-organic radicals, it being possible for R.sup.2 and R.sup.3 to be connected to give a 5- to 8-membered ring, PA1 R.sup.4 is hydrogen or an organic radical and PA1 A is an equivalent of an anion, by reacting an amidrazone II ##STR2## with a carboxylic acid III EQU R.sup.4 --COOH II or a functional derivative (IIIa) of this acid, an anion A being formed from III or IIIa which, optionally, can be replaced by another anion. The triazolium salts have great industrial importance as catalysts for the preparation of acyloine from aldehydes.