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Abstract

The invention relates to a method for the production of a.) aldehydes of formula (II): R.sup.1--CHO and b.) aldehydes of formula (III): R.sup.1--C(O)--R.sup.2 by reacting a.) primary alcohols (R.sup.1CH.sub.2--OH) or b.) secondary alcohols (R.sup.1--CH(OH)--R.sup.2) with cyclic phosphonic acid anhydrides in the presence of dialkyl-, diaryl- and/or alkyl-aryl sulphonic oxides at a temperature in the region of between -100 to +120.degree. C., whereby R.sup.1 and/or R.sup.2 represent H, a substituted linear or branched C.sub.1-C.sub.12-alkyl radical, a substituted C.sub.3-C.sub.10 cycloalkyl-, alkenyl-, aryl- or heteroaryl radical. A cyclic phosphonic acid anhydride is used, preferably, as a 2,4,6-substituted 1,3,5,2,4,6-trioxatriphosphinane of formula (I), wherein R' independently represents allyl, aryl or open-chained or branched C.sub.1-C.sub.12-alkyl-radicals. Optionally, the reaction can be carried out in the presence of a tertiary amine base NR.sup.5.sub.3 ##STR00001##

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