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Abstract

A process for preparing 3-hydroxyalkanals having 3 to 12 carbon atoms by hydration of 2-alkenals with homogeneous catalysis, by using as catalyst a compound corresponding to the formula ##STR1## wherein: z denotes H, C.sub.1 - to C.sub.6 -alkyl, --CH.sub.2 --CH(CH.sub.3) --Y' or --(CH.sub.2).sub.o --Y' R denotes H, C.sub.1 - to C.sub.6 -alkyl, benzyl, phenyl, .omega.-hydroxy --C.sub.1 - to C.sub.6 -alkyl, --CH.sub.2 --CH(CH.sub.3)--Y' or --(CH.sub.2).sub.o --Y' Y and Y' are identical or different and denote --COOH, --P(O) (OH).sub.2, --OH, pyridyl, or --P(O) (CH.sub.2 OH)OH, wherein the acid functional group may be present partly in the form of its alkali metal salt, alkaline-earth salt or ammonium salt n denotes 1, 2, 3, 4, 5 or 6 where Y is --COOH, --P(O) (OH).sub.2, pyridyl or --P(O) (CH.sub.2 OH) OH; 2 or 3 where Y is --OH o denotes 1, 2, 3, 4, 5 or 6 where Y' is --COOH, --P(O) (OH).sub.2, pyridyl or --P(O) (CH.sub.2 OH)OH; 0, 2 or 3 where Y' is --OH.

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