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Vanadyl(acetylacetonate) is the chemical compound with the formula VO(C5H7O2)2. This blue-green coordination complex consists of the vanadyl group, VO2+, bound to two acetylacetonate anions, acac−. Like other charge-neutral acetylacetonates, this complex is soluble in organic solvents.
Additional recommended knowledge
The complex is prepared from vanadium(IV) or vanadium(V) precursors, the latter being more convenient:
Structure and properties
The complex has a square pyramidal structure with a short V=O bond. This d1 compound is paramagnetic. Its optical spectrum exhibits two transtions. It is a weak Lewis acid, forming adducts with pyridine and methylamine.
It is used in organic chemistry as a reagent in the epoxidation of allylic alcohols in combination with tert-butylhydroperoxide (TBHP). The VO(acac)2-TBHP system is exclusively epoxidizes geraniol at the allylic alcohol position. For comparison, another epoxidizing agent m-CPBA, reacts exclusively with the other alkene group. TBHP oxidizes VO(acac)2 to a vanadium(V) species which coordinates the alcohol of the substrate and the hydroperoxide.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Vanadyl_acetylacetonate". A list of authors is available in Wikipedia.|