Process for preparing diesters of dicarboxylic acids
AssigneeUbe Industries, Ltd.
InventorsSumio Umemura, Kanenobu Matsui, Yoshinari Ikeda, Katsuro Masunaga, Takumi Kadota
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Abstract
A process for preparing a diester of a dicarboxylic acid having two more carbon atoms than the unsaturated hydrocarbon used as the starting material, which comprises subjecting an unsaturated hydrocarbon, carbon monoxide and an alcohol to reaction in the presence of a platinum group metal or a salt thereof; a compound selected from the group consisting of nitric acid, a nitrogen oxide and an ester of nitrous acid; and a halogen compound.
Claims16
A process for preparing a diester of a dicarboxylic acid having two more carbon atoms than the unsaturated hydrocarbon used as the starting material, which consists essentially of
- reacting in the liquid phase an unsaturated hydrocarbon, carbon monoxide and an alcohol in the presence of a platinum group metal;
- a compound selected from the group consisting of nitric acid, a nitrogen oxide, and an ester of nitrous acid used in an amount of from 0.0001 to 10 moles per liter of the reaction medium;
- and a halogen compound selected from the group consisting of (i) a halide of hydrogen, a platinum group metal, an alkali metal, an alkaline earth metal, cobalt, zinc, copper, iron, chromium, antimony, tin and manganese, and (ii) ammonium chloride, said halogen compound being used in an amount such that the ratio of the halogen atoms to the platinum group metal atoms is not more than 1.
Dependencies are inferred from the claim text.