Syntheses, structures, and spectroscopic properties of alkoxide, hydroxide, and siloxide complexes with (eta(3)-allyl)Mo moieties

Salts with binuclear anions of the general formula [(eta(3)-C3H4R)(CO)(2)Mo (mu-OR')(2)(mu-OR")-Mo(CO)(2)(eta(3)-C3H4R)](-) (R = H, R',R'' = Me, 2; R = CH3, R' = CH(CH3)(2), R" = OH, 3; R = CH3, R' = OH, R" = OSiMe3, 4) have b een synthesised via reaction of [(eta(3)-C3H4R)-Mo(CO)(2)(CH3CN)(2)(thf)]+B F4-, 1, with NaOMe, (NaOPr)-Pr-i, and KOSiMe3. All products were characteri sed spectroscopically and investigated by single crystal X-ray analysis. In the case of 3 low temperature 2D-NMR spectra revealed that the solid state structure is maintained in solution and that the compound shows a trigonal twist-rearrangement at room temperature.