Process for preparing an enaminoketone of formula I wherein R 1 is C 5 -C 10 aryl, optionally substituted by 1 to 5 halogen atoms, or C 5 -C 10 aryl exhibiting one, two or more heteroatoms selected from oxygen and nitrogen, and R 2 and R 3 are independently C 1 -C 6 alkyl, C 5 -C 10 aryl, C 5 -C 10 aryl exhibiting one, two or more heteroatoms selected from oxygen and nitrogen, or form together a 5 or 7 membered ring which comprises reacting a CF 3 O-ketone of the formula II wherein R 1 is as defined above with an aminoformylation reagent, wherein alkyl groups are linear, branched or cyclic hydrocarbon groups which can optionally exhibit one, two or more heteroatoms chosen from oxygen, nitrogen, phosphorus and sulphur and can optionally be substituted by additional groups chosen from -R', halogen (-X), alkoxy (-OR'), thioether or mercapto (-SR'), amino (-NR'2), silyl (-SiR'3), carboxyl (-COOR'), cyano (-CN), acyl (-(C=O)R') and amide (-CONR'2) groups, with R' being hydrogen or a C 1-12 -alkyl group which can exhibit one or more heteroatoms chosen from nitrogen, oxygen, phosphorus and sulphur, and wherein aryl groups are aromatic hydrocarbon groups which can exhibit one, two or more heteroatoms chosen from oxygen and nitrogen and can optionally be substituted by additional groups chosen from -R', halogen (-X), alkoxy (-OR'), thioether or mercapto (-SR'), amino (-NR'2), silyl (-SiR'3), carboxyl (-COOR'), cyano (-CN), acyl (-(C=O)R') and amide (-CONR2') groups, with R' being hydrogen or a C 1-12 -alkyl group which can exhibit one or more heteroatoms chosen from nitrogen, oxygen, phosphorous and sulphur. R 1 is C 5 -C 10 aryl, optionally substituted by 1 to 5 halogen atoms, or C 5 -C 10 aryl exhibiting one, two or more heteroatoms selected from oxygen and nitrogen, and R 2 and R 3 are independently C 1 -C 6 alkyl, C 5 -C 10 aryl, C 5 -C 10 aryl exhibiting one, two or more heteroatoms selected from oxygen and nitrogen, or form together a 5 or 7 membered ring reacting a CF 3 O-ketone of the formula II wherein R 1 is as defined above with an aminoformylation reagent, wherein alkyl groups are linear, branched or cyclic hydrocarbon groups which can optionally exhibit one, two or more heteroatoms chosen from oxygen, nitrogen, phosphorus and sulphur and can optionally be substituted by additional groups chosen from -R', halogen (-X), alkoxy (-OR'), thioether or mercapto (-SR'), amino (-NR'2), silyl (-SiR'3), carboxyl (-COOR'), cyano (-CN), acyl (-(C=O)R') and amide (-CONR'2) groups, with R' being hydrogen or a C 1-12 -alkyl group which can exhibit one or more heteroatoms chosen from nitrogen, oxygen, phosphorus and sulphur, and wherein aryl groups are aromatic hydrocarbon groups which can exhibit one, two or more heteroatoms chosen from oxygen and nitrogen and can optionally be substituted by additional groups chosen from -R', halogen (-X), alkoxy (-OR'), thioether or mercapto (-SR'), amino (-NR'2), silyl (-SiR'3), carboxyl (-COOR'), cyano (-CN), acyl (-(C=O)R') and amide (-CONR2') groups, with R' being hydrogen or a C 1-12 -alkyl group which can exhibit one or more heteroatoms chosen from nitrogen, oxygen, phosphorous and sulphur. wherein R 1 is as defined above with an aminoformylation reagent, wherein alkyl groups are linear, branched or cyclic hydrocarbon groups which can optionally exhibit one, two or more heteroatoms chosen from oxygen, nitrogen, phosphorus and sulphur and can optionally be substituted by additional groups chosen from -R', halogen (-X), alkoxy (-OR'), thioether or mercapto (-SR'), amino (-NR'2), silyl (-SiR'3), carboxyl (-COOR'), cyano (-CN), acyl (-(C=O)R') and amide (-CONR'2) groups, with R' being hydrogen or a C 1-12 -alkyl group which can exhibit one or more heteroatoms chosen from nitrogen, oxygen, phosphorus and sulphur, and wherein aryl groups are aromatic hydrocarbon groups which can exhibit one, two or more heteroatoms chosen from oxygen and nitrogen and can optionally be substituted by additional groups chosen from -R', halogen (-X), alkoxy (-OR'), thioether or mercapto (-SR'), amino (-NR'2), silyl (-SiR'3), carboxyl (-COOR'), cyano (-CN), acyl (-(C=O)R') and amide (-CONR2') groups, with R' being hydrogen or a C 1-12 -alkyl group which can exhibit one or more heteroatoms chosen from nitrogen, oxygen, phosphorous and sulphur.