Method comprising the method steps of: a) initially charging a diene having two conjugated double bonds; b) adding a phosphine ligand and a catalyst precursor selected from palladium dichloride, palladium dibromide, palladium diiodide, palladium acetylacetonate, palladium acetate, bis(dibenzylideneacetone)palladium, bis(acetonitrile)dichloropalladium, palladium (cinnamyl) dichloride; c) adding an alcohol; c') adding an acid to the reaction mixture; d) feeding in CO; d) heating the reaction mixture, with conversion of the diene to a di- or tricarboxylic ester; wherein the phosphine ligand is a compound according to formula where R 1, R 2, R 3, R 4 are selected from -(C 1 -C 12)-alkyl, - (C 6 -C 20)-aryl, -(C 3 -C 12)-cycloalkyl, -(C 3 -C 12)-heterocycloalkyl, -(C 3 -C 20)-heteroaryl; R 5, R 6 are selected from -H, - (C 1 -C 12)-alkyl, -(C 6 -C 20)-aryl, -(C 3 -C 12)-cycloalkyl, -(C 3 -C 12)-heterocycloalkyl, - (C 3 -C 20)-heteroaryl; and R 1, R 2, R 3, R 4, R 5, R 6, in the case that these are -(C 1 -C 12)-alkyl, -(C 6 -C 20) -aryl, -(C 3 -C 12)-cycloalkyl, -(C 3 -C 12)-heterocycloalkyl or -(C 3 -C 20)-heteroaryl, may be each substituted independently of one another by one or more substituents selected from -(C 1 -C 12)-alkyl, -(C 3 -C 12)-cycloalkyl, -(C 3 -C 12)-heterocycloalkyl, -O- (C 1 -C 12) -alkyl, -O- (C 1 -C 12)-alkyl-(C 6 -C 20) -aryl, -O-(C 3 -C 12)-cycloalkyl, -S-(C 1 -C 12)-alkyl, -S- (C 3 -C 12)-cycloalkyl, -COO- (C 1 -C 12) - alkyl, -COO- (C 3 -C 12)-cycloalkyl, -CONH- (C 1 -C 12) - alkyl, -CONH-(C 3 -C 12)-cycloalkyl, -CO- (C 1 -C 12) -alkyl, -CO-(C 3 -C 12)-cycloalkyl, -N-[(C 1 -C 12)-alkyl] 2, -(C 6 -C 20)-aryl, -(C 6 -C 20) -aryl-(C 1 -C 12)-alkyl, -(C 6 -C 20)-aryl-O-(C 1 -C 12) -alkyl, -(C 3 -C 20)-heteroaryl, -(C 3 -C 20)-heteroaryl-(C 1 -C 12) -alkyl, -(C 3 -C 20)-heteroaryl-O-(C 1 -C 12)-alkyl, -COOH, -OH, -SO 3 H, -NH 2, halogen. a) initially charging a diene having two conjugated double bonds; b) adding a phosphine ligand and a catalyst precursor selected from palladium dichloride, palladium dibromide, palladium diiodide, palladium acetylacetonate, palladium acetate, bis(dibenzylideneacetone)palladium, bis(acetonitrile)dichloropalladium, palladium (cinnamyl) dichloride; c) adding an alcohol; c') adding an acid to the reaction mixture; d) feeding in CO; d) heating the reaction mixture, with conversion of the diene to a di- or tricarboxylic ester; R 1, R 2, R 3, R 4 are selected from -(C 1 -C 12)-alkyl, - (C 6 -C 20)-aryl, -(C 3 -C 12)-cycloalkyl, -(C 3 -C 12)-heterocycloalkyl, -(C 3 -C 20)-heteroaryl; R 5, R 6 are selected from -H, - (C 1 -C 12)-alkyl, -(C 6 -C 20)-aryl, -(C 3 -C 12)-cycloalkyl, -(C 3 -C 12)-heterocycloalkyl, - (C 3 -C 20)-heteroaryl; and R 1, R 2, R 3, R 4, R 5, R 6, in the case that these are -(C 1 -C 12)-alkyl, -(C 6 -C 20) -aryl, -(C 3 -C 12)-cycloalkyl, -(C 3 -C 12)-heterocycloalkyl or -(C 3 -C 20)-heteroaryl, may be each substituted independently of one another by one or more substituents selected from -(C 1 -C 12)-alkyl, -(C 3 -C 12)-cycloalkyl, -(C 3 -C 12)-heterocycloalkyl, -O- (C 1 -C 12) -alkyl, -O- (C 1 -C 12)-alkyl-(C 6 -C 20) -aryl, -O-(C 3 -C 12)-cycloalkyl, -S-(C 1 -C 12)-alkyl, -S- (C 3 -C 12)-cycloalkyl, -COO- (C 1 -C 12) - alkyl, -COO- (C 3 -C 12)-cycloalkyl, -CONH- (C 1 -C 12) - alkyl, -CONH-(C 3 -C 12)-cycloalkyl, -CO- (C 1 -C 12) -alkyl, -CO-(C 3 -C 12)-cycloalkyl, -N-[(C 1 -C 12)-alkyl] 2, -(C 6 -C 20)-aryl, -(C 6 -C 20) -aryl-(C 1 -C 12)-alkyl, -(C 6 -C 20)-aryl-O-(C 1 -C 12) -alkyl, -(C 3 -C 20)-heteroaryl, -(C 3 -C 20)-heteroaryl-(C 1 -C 12) -alkyl, -(C 3 -C 20)-heteroaryl-O-(C 1 -C 12)-alkyl, -COOH, -OH, -SO 3 H, -NH 2, halogen.