Vanadyl acetonate

Among other organic compounds of vanadium the following are known Vanadous acetate,8 vanadous acetylacetonate, vanadous benzoyl-acetonatef vanadous carbamides,10 vanadyl acetonates,11 vanadyl acetate,... 

In Table 5 the values for the free standard enthalpies for the reactions of neutral donors and anion donors with vanadyl acetylacetonate are listed. It can be seen that towards the reference molecule iodide ion is a somewhat weaker ligand than propanediol carbonate, whereas the bromide ion is between tri-methylphosphate and acetone, and the chloride ion between DMF and DMSO 22>. The fluoride ion and the NCS -ion are stronger donors than all neutral donors but are somewhat weaker than the azide and the cyanide ion. 

Vanadyl (acac) 2 is a square pyramidal complex of two molecules of the enolate of acac acetyl acetone, pentan-2,4-dione) and the vanadyl (V=0) dication. It can easily accept another ligand to form an octahedral complex so there is... 

EPOXIDATION, ASYMMETRIC (- )-Benzylquininium chloride. f-Butyl hydroperoxide-Vanadyl acetoacetate. Hydrogen peroxide-1,1,3,3-Tetrachloro-acetone. (S)-(2-Hydroxy-N,N-dimethyl-propanamide-0,0 )oxodiperoxymolyb-denum(VI). 

Derivation Reaction of vanadyl sulfate with acetyl-acetone and sodium carbonate. 

Similarly, a bicyclic vinylcyclopropanol 18 underwent a regioselective hydroxylation with concomitant cyclopropane to cyclobutanone ring expansion when treated with vanadyl acetyl-acetonate and ter/-butyl hydroperoxide. 

Materials anhydrous TBHP was made by extracting a 70% TBHP solution (in water) in chlorobenzene and drying over 3A molecular sieves, to result in a 5 M solution. Cyclohexene and cyclooctene were distilled and were passed through a column of basic alumina before use. Vanadyl(IV) sulphate hydrate, Salen (N,N -bis(salicylidene)-ethylenediimine), 1,2,-dichloro-ethane (DCE), dichloromethane (DCM), acetone, and acetonitrile were reagent grade and used as received. (-) Carveol was purchased as a 1.48 1 mixture of trans- and cis-carveol and used as such. Cumylhydroperoxide was purchased as a 80% solution in cumene and used as received. 

V doped ZnO Zinc (11) acetyl acetonate, vanadyl (IV) acetyl acetonate, ethylene glycol, methyl alcohol... 

Vanadium pentoxide ribbons were obtained [295] via mixing of two solutions (a) AOT/toluene/water and (b) vanadyl isopropoxide in toluene. The suspensions obtained on mixing were converted to large, microporous ribbons of high surface area by acetone or toluene wash and solvent exchange procedures. 

The polymerization of diphenyldiacetylene in the presence of vanadyl acetyl-acetonate and triethylaluminum gave an open-chain polymer 10) [13]. However, when tri(isobutyl)aluminum and titanium tetrachloride were used to catalyze polymerization of [11], the product was postulated to contain another type of repeat unit [14] 35). The soluble product from the latter polymerization possessed a cryoscopic molecular weight of 1270 and a softening point of 255°-260°C. It also had good heat resistance, losing only 3% of its weight after 6 hours at 250°C in argon. Definite catalytic activity toward the decomposition of nitrous oxide was exhibited by this product [12,14]. 

The widely used asymmetrical epoxidation of allylic alcohols developed by Katsuki and Sharpless employs tert-batyl hydroperoxide (TBHP), enantiomerically pure tartaric acid esters, and isopropyl titanium(TV) (6). Similar results were obtained using TBHP and vanadyl acetyl acetonate VO(acac>2 and hexacarbonyl molybdenum [7,8]. The drawback of these reactions are their restriction to allylic alcohols, which is required as anchor group for the formation of the intermediate complex. 

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