Process for preparing diesters of malonic acid
AssigneeUbe Industries, Ltd.
InventorsHiroshi Itatani, Mikito Kashima, Tsutomu Suehiro
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Abstract
Disclosed is an improved process for preparing diesters of malonic acid by subjecting ketene, carbon monoxide and an ester of nitrous acid to a liquid phase reaction in an organic solvent, in which the reaction is carried out in the presence of a catalyst of a platinum group metal complex represented by the formula: L.sub.2 MX.sub.2 wherein, L represents a ligand selected from the group consisting of triorganophosphines, triorganophosphite and triorganoarsines; M represents a platinum group metal; and X represents a halogen or an acetic acid ion.
Claims21
A process for preparing diesters of malonic acid which comprises subjecting ketene, carbon monoxide and an ester of nitrous acid to a liquid phase homogeneous reaction in an organic solvent in the presence of a catalyst of a platinum group metal complex represented by the formula:
- L.sub.2 MX.sub.2
- wherein, L represents a ligand selected from the group consisting of a triorganophosphines, triorganophosphites and triorganoarsines;
- M represents a platinum group metal;
- and X represents a halogen or an acetic acid ion.
A process for preparing diesters of malonic acid which comprises subjecting ketene, carbon monoxide and an ester of nitrous acid to a liquid phase homogeneous reaction in an organic solvent selected from the group consisting of halogenated aliphatic hydrocarbons, aromatic hydrocarbons, halogenated aromatic hydrocarbons, esters, ethers, diethylaniline and N-methylpyrrolidone in the presence of a catalyst of a platinum group metal complex represented by the formula:
- L.sub.2 MX.sub.2
- wherein L is a ligand selected from the group consisting of trialkylphosphines, triarylphosphines, trialkylphosphites, triarylphosphites, trialkylarsines and triarylarsines;
- M is a platinum ion or a palladium ion;
- and X is a halogen ion or an acetic acid ion, said platinum group metal complex being present in an amount of from 0.1 to 100 mmoles per liter of the solvent.
Dependencies are inferred from the claim text.