Process for the preparation of 3 (4), 7 (8) -dihydroxymethyl-bicyclo (4.3.0) nonane

method for the preparation of 3 (4), 7 (8) -dihydroxymethyl-bicyclo [4.3.0] nonane by hydroformylation of bicyclo [4.3.0] nona-3,7-diene with subsequent hydrogenation, characterized in that bicyclo [4.3.0] nona-3,7-diene in homogeneous organic phase in the presence of triarylphosphines complexed rhodium compounds and excess triarylphosphine at temperatures of 70 to 160 ° C and pressing from 10 to 30 MPa with synthesis gas, where rhodium in a concentration of 10 to 500 ppm by weight, based on the homogeneous Reaction mixture is used and wherein the molar ratio of rhodium to phosphorus is 1:10 to 1: 200, and the thus obtained 3 (4), 7 (8) -bisformyl-bicyclo [4.3.0] nonane subsequently to Hydrogenated 3 (4), 7 (8) -dihydroxymethyl-bicyclo [4.3.0] nonane.