Vanadium diketonate ligands

According to the results of a polarographic study of a range of vanadium complexes including VO(dbm)2 and VO(acac)2, as the ligands diminish in donor power the oxidized state of the metal is preferentially stabilized. The ligand (24) acts as a P-diketonate in its vanadyl complex. The low value of v(V=0) 893 cm indicates... 

Palladium complexes with an heterocyclic N-containing ligand have been used in the carbonylation of aromatic nitro compounds with cocatalysts such as cyclopentadienyl halides or oxyhalides of transition metals belonging to group V e.g. CP2VCI) [168], a cyclopentadienyl halide or oxyhalide together with phosphorus oxytrichloride [169], or a 1,3-diketone derivative of vanadium [170], even also in the presenee of phosphorus oxychloride [171]. 

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