Patent ID: 9464018
Filing Date: 2016-10-11
CPC Classification: B01J,C07C

Claim Text:
1. A method for producing a dialdehyde, comprising reacting a linear olefinic compound having each of an ethylenic double bond and an aldehyde group on each end of the molecule with carbon monoxide and hydrogen in the presence of a rhodium catalyst comprising a bisphosphite of (I) and a rhodium compound, wherein the reaction pressure of a mixed gas formed of carbon monoxide and hydrogen is decreased as the reaction proceeds, and wherein the reaction solution at a time of initiation of the reaction comprises from 0.1 mmol/kg to 500 mmol/kg of water, and from 0.1 mmol/kg to 50 mmol/kg of a carboxylic acid in terms of carboxyl group: wherein R is a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and W is an alkylene group having 1 to 20 carbon atoms, a cycloalkylene group having 5 to 18 carbon atoms, or an alkylene-arylene group having 7 to 11 carbon atoms.