LIGANDS WITH CYCLOALKANE BACKBONES .2. CHELATE LIGANDS FROM 2-(DIPHENYLPHOSPHINYL)CYCLOHEXANOL - SYNTHESES AND TRANSITION-METAL COMPLEXES

Starting from PPh3 (Ph = C6H5), lithium metal, and epoxicyclohexane, ( +/-)-2-(diphenylphosphinyl)cyclohexanol (1) was obtained in about 80% yield in a one-pot reaction. Oxidation of the phosphine moiety, either with elemental sulfur or with hydrogen peroxide, gave the correspondi ng phosphine sulfide 3 reap. oxide 2. The latter compound forms dimers in the solid state. Reaction of the OH fragment of 1 and 3 with chlor odiphenyl phosphine led to new chiral bidentate ligands, bearing a pho sphinite donor fragment. Several new transition metal complexes of the se ligands were characterized spectroscopically and by X-ray structure analysis. (C) 1997 Elsevier Science S.A.