TRIPODAL LIGANDS WITH CYCLOPENTADIENYL DO NOR GROUP - STRUCTURE AND REACTIONS OF THE TRIPOD MOLYBDENUM TEMPLATE CH3C(CH2-ETA(C5H4)-C-5)(CH2PPH22MO

After deprotonating the tripodal ligand CH3C(CH2C5H5)(CH2PPh2)(2), 1, coordination of the cyclopentadienyl unit to Mo(CH3CN)(3)(CO)(3) is ac hieved by blocking the two diphenylphosphane groups with BH3. The moly denum complex -eta(5)-C5H4)(CH2-eta(2)-PPh2)(CH2PPh2)Mo(CO)(2)I, 2, is obtained after oxidation by iodine and splitting off the BH3 groups. The cleavage of the metal iodine bond in 2 is accessible via irradiati on of 2 with coordination of the remaining phosphane group to form the complex salt [CH3C(CH2-eta(5)-C5H4)(CH2PPh2)(2)Mo(CO)(2)]I, 3. On the other hand, the irradiation of 2 in the presence of air resulted in s ubstitution of the two carbonyl groups. The oxo molebydenum complex sa lt [CH3C(CH2-eta(5)-C5H4)(CH2PPh2)(2)MoO]I, 4, is obtained. The result s an established by ususal analytical methods as well as by X-ray anal yses in case of 3 and 4. (C) 1998 Elsevier Science S.A. All rights res erved.