| 摘要 |
The present invention accordingly provides a process for preparing aldehydes of the formula (I) in which one, two or all three radicals of the group R1, R3 and R5 denote hydroxyl, and the radical or radicals of the group R1, R3 and R5 that do not denote hydroxyl are, independently of one another, hydrogen, C1-C8 alkyl or C6-C14 aryl, and R2 and R4 independently of one another are hydrogen, C1-C8 alkyl, C1-C8 alkoxy or C6-C14 aryl, the process being characterized in that an aldehyde of the formula (II) in which one, two or all three radicals of the group R'1, R'3 and R'5 denote C1-C8 alkoxy, and the radical or radicals of the group R'1, R'3 and R'5 that do not denote C1-C8 alkoxy are, independently of one another, hydrogen, C1-C8 alkyl or C6-C14 aryl, and R2 and R4 have the definitions indicated under formula (I), is reacted at elevated temperature and elevated pressure in the presence of (C1-C4 alkyl)2-amine, and the reaction product of the formula (I) is subsequently isolated. |
