RUTHENIUM COMPLEXES WITH BRIDGING FUNCTIONALIZED ALKYLIDENE LIGANDS SYNTHESIS OF [RU2CP2(CO)2(MU-CO)(MU-C(X)N(ME)CH2PH)] (X=H,CN) AND MOLECULAR-STRUCTURE OF THE CN DERIVATIVE

The isocyanide complex [Ru2Cp2(CO)3(CNCH2Ph)], obtained by the reactio n of [RU2CP2(CO)4] With CNCH2Ph in the presence of Me3NO, has been N-a lkylated, yielding the cationic mu-alkylidyne complex [RU2CP2(CO)3{mu- CN(Me)CH2Ph}]SO3CF3. The compound yielded undergoes nucleophilic addit ion using NaBH4 or NnBu4CN at the mu-C alkylidyne carbon to give the n ovel mu-aminoalkylidene complexes [Ru2Cp2(CO)2(mu-CO)(mu-C(X)N(Me)CH2P h}] (X = H, CN). The derivative with X = CN adopts the expected geomet ry and an idealized C(s) symmetry if the phenyl substituent is ignored . The relevant bond distances are as follows: Ru-Ru, 2.711(1) angstrom , Ru-mu-C(carbene), 2.090(4) angstrom (ave.); C(carbene)-N, 1.477(5) a ngstrom; N-C(alkyl), 1.474(5) angstrom (ave.).