abstract |
The invention relates to a method for producing aldehydes by reacting an a,ß-unsaturated carboxylic acid or the salt thereof with carbon monoxide and hydrogen in the presence of a catalyst, said catalyst comprising at least one complex of a metal of subgroup VIII of the periodic system of the elements with a compound of formula (I), wherein Pn represents pnicogen; W represents a bivalent bridging group with 1 to 8 bridging atoms between the flanking bonds; R1 represents a functional group capable of forming at least one intermolecular, non-covalent bond with the group -X(=O)OH of the compound of formula (I); R2, R3 represent optionally substituted alkyl, cycloalkyl, heterocycloalkyl, aryl or hetaryl each, or together with the pnicogen atom, and, if applicable, together with the groups Y2 and Y3 represent a non-anellated or anellated and unsubstituted or substituted 5- to 8-membered heterocycle; a, b and c is 0 or 1; and Y1, Y2, Y3 independently represent O, S, NRa, or SiRbRc, wherein Ra, Rb, Rc represent H or unsubstituted or substituted alkyl, cycloalkyl, heterocycloalkyl, aryl or hetaryl each. The invention also relates to the use of said catalyst for the decarboxylating hydroformylation of a,ß-unsaturated carboxylic acids. |