Tripodal ligands with cyclopentadienyl donor group:: Structure and reactions of the tripod molybdenum template CH3C(CH2-η5C5H4)(CH2PPh22Mo

After deprotonating the tripodal ligand CH3C(CH2C5H5)(CH2PPh2)(2), 1, coordination of the cyclopentadienyl unit to Mo(CH3CN)(3)(CO)(3) is achieved by blocking the two diphenylphosphane groups with BH3. The molydenum complex CH3C(CH2-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 irradiation 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 substitution of the two carbonyl groups. The oxo molebydenum complex salt [CH3C(CH2-eta(5)-C5H4)(CH2PPh2)(2)MoO]I, 4, is obtained. The results an established by ususal analytical methods as well as by X-ray analyses in case of 3 and 4. (C) 1998 Elsevier Science S.A. All rights reserved.