| Abstract |
Reaction of [Cp2Mo(eta2-NCMe)] (1) with PMe3 affords [Cp2Mo(PMe3)] (2). which is readily alkylated go give [Cp2MoR(PMe3)]PF6(3a, R=Me; 3b, R=Et). The crystal structure of 2 shows tricoordination around the Mo atom. Cyclic voltammetry of 3a and 3b and the analogues [Cp2MoR(CNMe)]I, (4a, R = Me; 4b, R = Et) and [Cp2MoMe(PPh3)]PF6 (7) shows one reversible one-electron oxidation, but the potential is independent of R, in contrast to the complexes [Cp2MoR2]. Oxidative addition of Et2S2, Ph2Se2 or (PhCOO)2 to 1 yields [Cp2Mo(ER)2] (E = O, S or Se). The molybdenocene alkyl hydrides [Cp2Mo(H)Me] (5) and [Cp2MoH(CH2PPh3)]I . THF (6) are prepared from [Cp2MoHI]. Thermal decomposition of 6 as well as reaction of [Cp2MoMe2]+ with Ph3C provide evidence for transient formation of the methylidene complex [Cp2MoH(CH2)]+. |
