| abstract |
In the present invention, the aldehyde and the alcohol are supported on the carrier, the acid strength (pKa) is 4.8 or more, the ammonia chemisorption amount at 0 ° C. is 0 to 150 mol / g-catalyst, and at least palladium and X (where X is It provides a process for the preparation of carboxylic acid esters, which comprises reacting in a liquid phase in the presence of molecular oxygen using a catalyst comprising bismuth and / or lead). |