CHIRAL TRIPOD LIGANDS WITH A CYCLOPENTADI ENYL AND 2 PHOSPHINE DONOR FUNCTIONS - SYNTHESIS AND COMPLEXATION CHEMISTRY

Different routes to tripod ligands CH3C(CH(2)C(5)H5)(CH2PR2')(CH2PR2 ' '), 5, containing a cyclopentadienyl unit and two additional donor gro ups are described. The syntheses involve CH2OCH2C(CH3)(CH2C5H5), 2, or CH3C(CH2Cl)(CH2Br)(CH2C5H5)(5) 12, respectively as intermediates. The compounds 2 and 12 respectively are obtained from CH2OCH2(CH3)(CH2OSO 2CH3), 1, or CH3C(CH2Cl)(CH2Br)(CH2OSO2CF3), 11, by reaction with CpMg Cl. The capability of the ligand 5 to coordinate to a transition metal via all its three donor groups is documented by the analytical, spect roscopical and X-ray structural characterisation of CH3C(CH2-eta(5)-C5 H4)(CH2PPh2)(2)Mn(CO), 13.