| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of prevention against polymerization without inhibiting the reaction in the preparation of a carboxylic ester by reaction of an unsaturated aldehyde with an alcohol in liquid phase using a catalyst containing at least palladium. SOLUTION: This method of prevention against polymerization comprises the use of at least one compound as a polymerization inhibitor selected from the group consisting of compounds etch having one or more nonconjugated phenolic hydroxyl groups, compounds each having intramolecular N-oxyl group and compounds each having intramolecular N-nitrosyl group in the preparation of an unsaturated carboxylic ester by reaction of an unsaturated aldehyde with an alcohol in liquid phase and in the presence of molecular oxygen using a catalyst containing at least palladium. |
