C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/486.7
C07C 69/36 (2006.01) C07C 67/36 (2006.01)
Patent
CA 1144940
ABSTRACT OF THE DISCLOSURE: The invention relates to a process for the prepa- ration of alkyl esters of oxalic acid, wherein said esters are obtained by reaction, in a gaseous phase, of an alkyl nitrite having the formula R-ONO, wherein R represents an alkyl having from 1 to 10 carbon atoms, with carbon monoxide in the presence of at least one catalyst selected from the group consisting of: a) rhodium, iridium, platinum , gold and the salts thereof, with or without a co-catalyst selected from the group consisting of iron, copper and the salts thereof, and b) palladium in combination with a co-catalyst selected from the group con- sisting of iron, copper and the salts thereof, the salts of the hereinabove defined metals being selected from the group consisting of chlorides, sulphates, nitrates, acetates and acetylacetonates, at a temperature between 50 and 500°C, under at least atmospheric pressure. This process allows a simple an unexpensive preparation of oxalic acids ester in high yields and high quality.
330654
Agnes Giovanni
Rucci Guglielmo
Santini Claudio
Montedison S.p.a.
Robic Robic & Associes/associates
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