aldehyde functional compounds

A process for preparing aldehydfunktionaler compounds by cross-metathesis reaction of an olefinic compound having at least one hydroxyl group and at least one C-C double bond with at least one at least mono-unsaturated fatty acid or at least one of at least monounsaturated fatty acid derivative in the presence of a metathesis catalyst at a temperature of at most 180 ° C and in the presence of at least one reactant which acts with respect to the aldehyde group of the aldehyde compounds as protecting groups forming compound.