| 摘要 |
The invention relates to a method for producing optionally substituted aliphatic, aromatic or heteraromatic aldehydes of formula (I), whereby the R represents a C1-C20 Alkyl radical, an aromatic or heteraromatic radical Ar which can optionally be substituted once or on a number of occasions by OH, C1- C6 alkyl, C1-C6 alkoxy, C1-C6 carboxylic acids or ester containing 1-6 C ato ms in the ester part, phenyl, halogen, SO3H, NO2, NR1R2 or SR1 whereby R1 and R 2 can be independently H, phenyl or C1-C6 alkyl. The invention is characterise d by a compound of formula (II) wherein R has the above meaning, a) is diazotized in an acidic medium, at a temperature of between - 10 - + 100 ~C by a diazoation reagent and is transformed into the corresponding hydroxy carbo xy acid whereby b) is transformed, by means of oxygen, into the appropriate aldehyde of formula (I) in the presence of a metal, the salt thereof, oxide or hydroxide as a catalyst.
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