Vanadium pyridonates: dimerization, redox behaviour, and metal–ligand cooperativity

Abstract

The synthesis, structure, and reactivity of vanadium pyridonate complexes are described. Vanadium(III) pyridonate complexes were accessed through protonolysis and reduction of a tetrakis(amido)vanadium(IV) starting material. Bis(pyridonate) vanadium(IV) precursors could be...

2-Pyridonates: a versatile ligand platform in 3d transition metal coordination chemistry and catalysis

“…Very recently, Schafer et al also reported the synthesis and reactivity of vanadium(III) pyridonates. 60,61…”

“…Very recently, Schafer et al also reported the synthesis and reactivity of vanadium( iii ) pyridonates. 60,61 Complex 17 could be accessed from (THF)V III (Mes) 3 (ref. 61) and V IV (NMe 2 ) 4 (ref.…”

“…61) and V IV (NMe 2 ) 4 (ref. 60) by reaction with 6-methylpyridone (Scheme 8, top). The synthesis from the V IV precursor involves protolytic ligand exchange and reduction with in situ generated HNMe 2 acting as reductant.…”

“…Strong donors such as 4-dimethylaminopyridine (DMAP) afford monomeric complexes. 60 Complex 17 was employed as catalysts in the reductive deoxygenative coupling of benzyl alcohols to hydrocarbons. Key catalyst intermediates were isolated with diphenylmethanol as model substrate and a reaction mechanism involving V( iii ) and V( iv ) states was proposed (Scheme 8, bottom).…”