Molybdenum main group complex

In the case of other Group 6 metals, the polymerization of olefins has attracted little attention. Some molybdenum(VI) and tungsten(VI) complexes containing bulky imido- and alkoxo-ligands have been mainly used for metathesis reactions and the ring-opening metathesis polymerization (ROMP) of norbornene or related olefins [266-268]. Tris(butadiene) complexes of molybdenum ) and tungsten(O) are air-stable and sublimable above 100°C [269,270]. At elevated temperature, they showed catalytic activity for the polymerization of ethylene [271]. 

These last signals are enhanced at the expense of the main reduction process at -0.94 V in successive potential scans, thus denoting that a net interconversion of the original Mo(VI)-LDH-associated species to molybdenum species in other oxidation states occurs. This voltammetry can be represented in terms of the reduction of the /flc-trioxo Mo(VI) complex to a Mo(IV) analogue accompanied by the loss of an oxo group, followed by oxidation to an Mo(V) analogue (Domenech et al., 1998). The sequence of electrochemical processes can be represented as ... 

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