A process of manufacturing compound of formula (I-A) or (II-A) by asymmetric hydrogenation of an unsaturated ketone or unsaturated aldehyde of the formula or with molecular hydrogen in the presence of at least one chiral iridium complex and in the presence of at least one additive and a halogenated alcohol wherein Q stands for H or CH 3 and m and p stand independently from each other for a value of 0 to 3 with the proviso that the sum of m and p is 0 to 3, and where a wavy line represents a carbon-carbon bond which is linked to the adjacent carbon-carbon double bond so as to have said carbon-carbon double bond either in the Z or in the E-configuration and where the substructures in formula and represented by s1 and s2 can be in any sequence; and wherein the double bond having dotted line ( ------) in formula and represents either a single carbon-carbon bond or a double carbon-carbon bond; and wherein ✧ represents a stereogenic centre; and wherein the additive is selected from the group consisting of organic sulfonic acids, transition metal salts of organic sulfonic acids, metal alkoxides, aluminoxanes, alkyl aluminoxanes and B (3-v) v; wherein v stands for 0, 1, 2 or 3 and R stands for F, a C 1-6 -alkyl, a halogenated C 1-6 -alkyl, an aryl or halogenated aryl group; and Z stands a C 1-6 -alkyl, a halogenated C 1-6 -alkyl, an aryl or halogenated aryl group; wherein the chiral iridium complex is a chiral iridium complex of the following formula (III-0) wherein P-Q-N stands for a chelating organic ligand comprising a stereogenic centre or has planar or axial chirality and has a nitrogen and phosphorous atom as binding site to the iridium centre of the complex; Y 1, Y 2, Y 3 and Y 4 are independently from each other hydrogen atoms, C 1-12 -alkyl, C 5-10 -cycloalkyl, or aromatic group; or at least two of them form together at least a two-valent bridged group of at least 2 carbon atoms; and Y ⊝ is an anion, particularly selected from the group consisting of halide, PF 6 -, SbF 6 -, tetra(3,5-bis(trifluoromethyl)phenyl)borate (BAr F - BF 4 -, perfluorinated sulfonates, preferably F 3 C-SO 3 - or F 9 C 4 -SO 3 - ClO 4 -, Al(OC 6 F 5) 4 -, Al(OC(CF 3) 3) 4 -, N(SO 2 CF 3) 2 - N(SO 2 C 4 F 9) 2 - and B(C 6 F 5) 4 -. wherein Q stands for H or CH 3 and m and p stand independently from each other for a value of 0 to 3 with the proviso that the sum of m and p is 0 to 3, and where a wavy line represents a carbon-carbon bond which is linked to the adjacent carbon-carbon double bond so as to have said carbon-carbon double bond either in the Z or in the E-configuration and where the substructures in formula and represented by s1 and s2 can be in any sequence; and wherein the double bond having dotted line ( ------) in formula and represents either a single carbon-carbon bond or a double carbon-carbon bond; and wherein ✧ represents a stereogenic centre; and wherein the additive is selected from the group consisting of organic sulfonic acids, transition metal salts of organic sulfonic acids, metal alkoxides, aluminoxanes, alkyl aluminoxanes and B (3-v) v; wherein v stands for 0, 1, 2 or 3 and R stands for F, a C 1-6 -alkyl, a halogenated C 1-6 -alkyl, an aryl or halogenated aryl group; and Z stands a C 1-6 -alkyl, a halogenated C 1-6 -alkyl, an aryl or halogenated aryl group; P-Q-N stands for a chelating organic ligand comprising a stereogenic centre or has planar or axial chirality and has a nitrogen and phosphorous atom as binding site to the iridium centre of the complex; Y 1, Y 2, Y 3 and Y 4 are independently from each other hydrogen atoms, C 1-12 -alkyl, C 5-10 -cycloalkyl, or aromatic group; or at least two of them form together at least a two-valent bridged group of at least 2 carbon atoms; and Y ⊝ is an anion, particularly selected from the group consisting of halide, PF 6 -, SbF 6 -, tetra(3,5-bis(trifluoromethyl)phenyl)borate (BAr F - BF 4 -, perfluorinated sulfonates, preferably F 3 C-SO 3 - or F 9 C 4 -SO 3 - ClO 4 -, Al(OC 6 F 5) 4 -, Al(OC(CF 3) 3) 4 -, N(SO 2 CF 3) 2 - N(SO 2 C 4 F 9) 2 - and B(C 6 F 5) 4 -.