The reactivity of molybdenum pentachloride with ethers: routes to the synthesis of MoIVCl4 adducts, Mo(v) chlorido-alkoxides and Mo(v) oxydo-chlorides

The reactivity of molybdenum pentachloride, 1, with a selection of mono-and diethers was investigated at room temperature in a non-coordinating solvent (dichloromethane). The Mo(IV) complex MoCl4(OMe2)(2), 2, was obtained in 75% yield by the reaction of 1 with an excess of Me2O; similarly, MoCl4(kappa(2)-L) [L = EtOCH2CH2OEt, 6a; MeOCH2CH(Me)OMe, 6b] were prepared in good yields by 1 : 1 combination of 1 with the appropriate diether. MoCl5 reacted with OMePh and Et2O affording variable amounts of RCl (R = Me and Et, respectively); MoCl3(OPh)(2), 3, was isolated in 60% yield from 1 and OMePh. The reactions of 1 with (OMeBu)-Bu-t, (OBu)-Bu-t(CH=CH2), MeOCH2CH2OCH2Cl and 1,3-dioxane proceeded with non-selective activation of the organic material. The oxido-complexes Mo2O2Cl4(mu-OMe)(2) (mu-MeOH), 4, and MoOCl3(MeOH)(2), 5, were isolated in modest amounts from 1/(OMeBu)-Bu-t, whereas MoOCl3(kappa(2)-MeOCH2CH2OCH2Cl), 7, was obtained in 32% yield from 1/MeOCH2CH2OCH2Cl. All of the isolated metal products were characterized by spectroscopic and analytical techniques, and by X-ray diffractometry in the cases of 2, 4, 5, 6b and 7. NMR/GC-MS analyses were carried out in order to outline the fragmentation pathways of the organic reactants.