Platinum–diphosphine–tin systems as active and selective hydroformylation catalysts

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Abstract
The activity of a platinum dichloride–phosphine–tin(II) chloride complex as a hydroformylation catalyst was dramatically enhanced by the use of diphosphine ligands which were capable of forming a strained seven-membered chelate ring; the best ligand was trans-1,2-bis(diphenylphosphinomethyl)cyclobutane, which afforded hexanals (n/iso = 99/1) from pent-1-ene with a much higher reaction rate than by the use of HRh(CO)(PPh3)3.