Patent ID: 7193116

Claim:
A process for the catalytic hydroformylation of an olefinically unsaturated compound having from 3 to 24 carbon atoms using an unmodified catalyst comprising rhodium, wherein the hydroformylation is carried out in the presence of a cyclic carbonic ester of the formula I where R 1 , R 2 , R 3 , R 4 are identical or different and are each H or a substituted or unsubstituted aliphatic, alicyclic, aromatic, aliphatic-alicyclic, aliphatic-aromatic or alicyclic-aromatic hydrocarbon radical having from 1 to 27 carbon atoms, n is 0–5 X is a divalent substituted or unsubstituted, aliphatic, alicyclic, aromatic, aliphatic-alicyclic or aliphatic-aromatic hydrocarbon radical having from 1 to 27 carbon atoms, with the proportion of the carbonic ester being at least 1% by weight of the reaction mixture.