Process for the preparation of oxalate esters
AssigneeAtlantic Richfield Company
InventorLee R. Zehner
Life of this patent
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Abstract
A process for the preparation of oxalate esters by reacting an alcohol with a mixture of carbon monoxide and oxygen in the presence of a catalytic mixture of: (a) a palladium, rhodium, platinum, copper, or cadmium metal salt compound or mixture thereof, (b) an aliphatic, cycloaliphatic, aromatic or heterocyclic amine or ammonia, (c) a copper (I), copper (II), iron (II) or iron (III) oxidant salt compound, and (d) an ammonium or substituted ammonium salt compound or acid with a counterion other than a halide. Alternatively a ligand or coordination complex compound of the metal salt compound may be employed.
Claims34
A process for the preparation of oxalate esters of an alcohol which comprises reacting a monohydric saturated aliphatic, alicyclic or aralkyl alcohol containing from 1 to 20 carbon atoms and which may contain other substituents which do not interfere with the reaction, with a mixture of carbon monoxide and oxygen at a pressure of between about 500 psig to 5000 psig and at a temperature in the range of about 40.degree. C. to 150.degree. C. in the presence of an effective amount of a catalytic mixture of
- (a) a palladium, rhodium, platinum, copper or cadmium metal salt compound or mixtures thereof,
- (b) an aliphatic, cycloaliphatic aromatic or heterocyclic amine or ammonia,
- (c) a copper (I), copper (II), iron (II) or iron (III) oxidant salt compound and
- (d) from about 0.1 to 40 weight percent of an ammonium or substituted ammonium salt compound with a counterion other than a halide, and recovering the desired oxalate ester.
Dependencies are inferred from the claim text.