Process for the preparation of oxalyl chloride

US4341720A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Axel Vogel · Ingolstadt, DE
• Guido Steffan · Odenthal, DE
• Karl Mannes · Leverkusen, DE
• Viktor Trescher · Leverkusen, DE

Key dates

• Filing date: Mar 24, 1981
• Grant date: Jul 27, 1982
• Expiry date: Mar 24, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/60
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

In a process for the preparation of oxalyl chloride from an oxalic acid compound of the formula ##STR1## wherein R.sup.1 and R.sup.2 are identical or different and represent hydrogen or a lower alkyl radical, and phosphorus pentachloride in the presence of phosphorus oxychloride, the improvement wherein the reaction is carried out in the presence of an amino compound of the formula ##STR2## wherein R.sup.3 represents alkyl, aralkyl, aryl or an acyl group, optionally substituted by amino or carboxamido and PA1 R.sup.4 and R.sup.5 are identical or different and represent hydrogen or alkyl, aralkyl, or aryl, optionally substituted by amino or carboxamido, or PA1 R.sup.4 and R.sup.5 are linked in an optionally substituted carbocyclic ring with 5 to 7 ring members, which optionally contains nitrogen, sulphur and/or oxygen and is optionally substituted by alkyl, aralkyl, aryl and/or amino groups, and PA1 R.sup.3 represents hydrogen or alkyl, which can be linked with R.sup.4 to form a carbocyclic ring, aralkyl or aryl, optionally substituted by an amino or carboxamido group, or optionally forms a double bond in one of the radials R.sup.4 or R.sup.5, and the oxalyl chloride formed is disti…