Process for the preparation of oxalyl chloride

Details Process for the preparation of oxalyl chloride Process for the preparation of oxalyl chloride

C - Chemistry, Metallurgy

07

C

260/539.6

C07C 57/64 (2006.01) C07C 51/60 (2006.01)

Patent

CA 1114837

Bayer 3782-JFW/ea ABSTRACT OF THE DISCLOSURE In a process for the preparation of oxalyl chloride from an oxalic acid compound of the formula Image wherein R1 and R2 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 Image wherein R3 represents alkyl, aralkyl, aryl or an acyl group, optionally substituted by amino or carboxamido and R4 and R5 are identical or different and represent hydrogen or alkyl, aralkyl, or aryl, optionally substituted by amino or carboxamido, or R4 and R5 are linked in an optionally substituted carbocyclic ring with 5 to 7 ring members, which optionally contains nitrogen, sulphur and/or oxygen Le A 18 954 and is optionally substituted by alkyl, aralkyl, aryl and/or amino groups, and R3 represents hydrogen or alkyl, which can be linked with R4 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 R4 or R5, and the oxalyl chloride formed is distilled off during the reaction. Le A 18 954

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