Synthesis and structural characterization of new mixed-ring indenyl derivatives of molybdenum containing phosphorus ligands

abstract

Reaction of NaBH4 with [IndCpMo(dppe)](BF4)(2) (1) in acetone yields [IndMo(eta(4)-C5H6)(dppe)]BF4 (2) quantitatively. The hydride addition takes place at the external face of the Cp ring. Dissolution of 2 in dichloromethane gives [IndMo(eta(4)-C5H5-exo-CH2Cl)(dppe)]BF4, as confirmed by elemental analysis, IR and H-1 NMR spectroscopy. The similar dication [IndCpMo- {P(OMe)(3))(2)](BF4)(2) (4) reacts with NaBH4, in a solvent dependent manner. In acetonitrile, [IndMo(eta(4)-C5H6){P(OMe)(3)}(2)]BF4 (5) is obtained and in acetone a P(OMe)(3) ligand is lost resulting in the asymmetric phosphite-hydride, [IndCpMoH{P(OMe)(3)}](+) (6). The molecular structures of [IndMo(eta(4)-C5H6){P(OMe)(3)}(2)]PF6 and [IndCpMoH{P(OMe)(3)}]PF6 were characterized by single-crystal X-ray diffraction. (c) 2007 Elsevier B.V. All rights reserved.

keywords

BIS-INDENYL; TUNGSTENOCENE DERIVATIVES; METALLOPHOSPHIDE ANIONS; ELECTROPHILIC ADDITION; GRIGNARD-REAGENTS; X-RAY; COMPLEXES; REACTIVITY; CYCLOPENTADIENYL; MO

subject category

Chemistry

authors

Goncalves, IS; Pereira, CCL; Gamelas, CA; Hazell, A; Romao, CC

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