FUNCTIONALIZED CYCLOPENTADIENYL LIGANDS F OR STRUCTURE OF TRIPOD COMPLEXES - SYNTHESIS AND COMPLEX CHEMISTRY

Starting from the functionalized oxetan <(CH2OCH2C)over bar>(CH2Br)(CH 2OSO2CH3), 1, the synthesis of hydroxy functionalized tripod ligands o f the type HOCH2C(CH2C5H5)(CH2PPh2)(CH2PR2), 3a-c (R = Ph, m-Xylyl, DB P), is achieved in two steps. Instead of PR2 a thiobenzyl donor group is fixed to the neopentane backbone and the ligand HOCH2C(CH2C5H5)(CH2 PPh2)(CH(2)SBz), 8, is obtained. The capability for further functional isation of the hydroxy function in 3 is demonstrated with the formatio n of the acetyl derivative CH3CO2CH2C(CH2C5H5)(CH2PPh2)(2), 5. The dep rotonated chelating ligands of the type 3 and 5 react with (PPh3)(2)Fe Cl2 to the iron complexes ROCH2C(CH2-eta(5)-C5H4)(CH2PPh2)(2)FeCl, 9a, b (R = H, CH3CO).