| abstract |
(57) [Problem] To provide a method for easily performing oxidative aryl esterification of aldehydes in high yield under mild reaction conditions without using special equipment. An aldehyde is represented by a general formula (1) (Wherein, R 1 , R 2 , R 3 , and R 4 may be the same or different and each represents an alkyl group, and R 1 and R 3 are combined to form a 5-membered ring or a 6-membered ring. In the formula, R 5 , R 6 , R 7 , R 8 , and R 9 may be the same or different, and each represents a hydrogen atom, an alkyl group, an aryl group, an aralkyl group, an alkoxy group, or a halogen. A tetraalkyl-O-aryl-isouronium = hydrogen fluoride compound represented by the following formula: |