The one-pot synthesis of cyclohexylmethanol from cyclohexene has been realized using a tandem catalytic system formed by the Co2(CO)8 complex for hydroformylation and different [Ru(CO)2(PPh3)X2]2 (X: Cl, Br, I) complexes for hydrogenation. The sole ruthenium(II) complexes [Ru(CO)2(PPh3)X2]2 (X: Cl, Br, I) are also able to synthesize cyclohexylmethanol from cyclohexene but a large part of the olefin