We have experimentally proved the unsymmetrical 1,1-diboration of diazo compounds, formed in situ from aldehydes and cyclic and non-cyclic ketones, in the absence of any transition metal complex. The heterolytic cleavage of the mixed diboron reagent, Bpin-Bdan, and the formation of two geminal C-Bpin and C-Bdan bonds has been rationalised based on DFT calculations to occur via a concerted-async...

Re(VII) oxides catalyze the acetalization, monoperoxyacetalization, monothioacetalization and allylation of hemiacetals. The reactions, which take place under mild conditions and at low catalyst loadings, can be conducted using hemiacetals, the corresponding O-silyl ethers, and, in some cases, the acetal dimers. Aldehydes react under similar conditions to furnish good yields of dithioacetals. R...

TiO₂ hollow spheres modified with spatially separated Ag species and RuO₂ cocatalysts have been prepared via an alkoxide hydrolysis-precipitation method and a facile impregnation method. High-resolution transmission electron microscopy studies indicate that Ag species and RuO₂ co-located on the inner and outer surface of TiO₂ hollow spheres, respectively. The resultant catalysts show significan...

AbstracL A selective and efficient protocol for the catalytic asymmetric cyclopropanation of allylic alcohols has been developed. The reaction involves preformation of the ethylzinc alkoxide of the alcohol and reaction with the FurukawdSimmons-Smith reagent. Zinc iodide has been shown to have a beneficial effect on the rate and enantioselectivity of the reaction. The structural variability in t...

The well-defined copper(I) boryl complex [(IPr)Cu(Bpin)] [where IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene, and pin = pinacolate: 2,3-dimethyl-2,3-butanediolate] deoxygenates CO2 rapidly and quantitatively, affording CO and the borate complex [(IPr)Cu(OBpin)]. The boryl may be regenerated by treatment with the diboron compound pinB-Bpin, giving the stable byproduct pinB-O-Bpin. The ...

The effect of low concentrations of Fe203, AI203 and Bi203 on the sintering behaviour of (ZrO2)o.83 (YO1.s)o.17, made by alkoxide synthesis, has been investigated. The best results are achieved with Bi203 as a sinter agent and a relative density of 95% is obtained at 1200 K. The effects of these impurities on the electrical conductivity of the bulk and the grain boundaries has been investigated...

Ferroe lectri c Pb(Zr,Ti)O, (PZT) thin films ha ve been fa bri cated by the alkoxide based so l-ge l method. PZT stoc k so lutions ha ve been spin coated on glass. sili con and metalli sed sil ico n substrate. The coating is repeated until 0.6 ~lIn thick ness of film has been deposited on various substrates. PZT thin films have been an ne led at vari ous temperatures and characte rized by X-ray...

The first efficient and non-precious nanoparticle catalyst for alkene hydrosilylation with commercially relevant tertiary silanes has been developed. The nickel nanoparticle catalyst was prepared in situ from a simple nickel alkoxide precatalyst Ni(O(t) Bu)2 ⋅x KCl. The catalyst exhibits high activity for anti-Markovnikov hydrosilylation of unactivated terminal alkenes and isomerizing hydrosily...

The anion of the title salt, (C(10)H(10)NO)[Zn(C(10)H(8)NO)I(2)]·CH(3)OH, has its metal atom N,O-chelated by the deprotonated 2-methyl-8-hy-droxy-quinoline ligand. The hy-droxy unit of the cation is a hydrogen-bond donor to the alkoxide O atom of the tetra-hedrally coordinated anion, whereas the ammonium cation acts as a hydrogen-bond donor to the methano-lic O atom. In the crystal, adjacent io...

Theoretical description (MP2/6-311G* and B3LYP/6-311G*) is presented for hypovalent titanium alkoxide model compounds showing linear angleTi-O-C angles. This feature is explained by the existence of a polarized triple Ti-O bond. In contrast, a series of 18 electron germanium derivatives displaying bent angleGe-O-C angles contain polarized single Ge-O bonds. The nature of the Ti-O and Ge-O bonds...