The hydroformylation of camphene in the presence of platinum(II)/tin(II)/phosphine (diphosphine) catalytic systems with various achiral and chiral P-donor ligands has been studied. The reaction occurs regio-specifically to give exclusively the linear isomer of the corresponding aldehyde. With triphenylphosphine and chelating achiral diphosphines, i.e. 1,2-bis(diphenylphosphino) ethane, 1,3-bis(diphenylphosphino) propane and 1,4-bis(diphenylphosphino) butane, the chemoselectivity for hydroformylation of 90-96% and diastereoisomeric excess (d.e.) of the exo isomeric aldehyde of 16-30% have been achieved. The highest d.e. of 60% has been shown by the platinum/tin/(R)- or (S)-BINAP system (BINAP-2,2'-bis(diphenylphosphino)-1,1'-binaphthyl) with ca. 90% chemoselectivity for hydroformylation products at ca. 90% camphene conversion. A new aldehyde derived from alpha-fenchene, which could result from the skeletal isomerization of camphene under the reaction conditions has been detected (up to 30%) at the elevated tin/platinum ratio. (C) 2002 Elsevier Science B.V All rights reserved.