Protonation of the highly reactive 1:1 intermediates, produced in the reaction between triphenylphosphine and acetylenic esters, by NH-acids such as azathioprine, imidazole or theophylline leads to the formation of vinyltriphenylphosphonium salts, which undergo a Michael addition reaction with a conjugate base to produce phosphorus ylides. Silica nanoparticles (silica NPs were prepared by therm...

N-Vinyl nitrones derived from fluorenone have been prepared via a copper-mediated coupling between fluorenone oxime and vinyl boronic acids. These compounds undergo subsequent rearrangement and addition reactions that are distinct from the traditional [3 + 2] cycloaddition reactivity of nitrones. Thermal rearrangements of fluorenone N-vinyl nitrones give spiroisoxazolines, while treatment with ...

in this study silver/poly vinyl alcohol (pva) and silver/poly vinyl pyrrolidone (pvp) nanocomposites were prepared via reduction of silver salt by employing dmf (n, n`- dimethyl formamide) as a reducing agent. effects of protective agents such as pva and pvp were also described here. we show that the acidic ph of pvp solution also affects the interaction between protective agents and silver nan...

A stereospecific palladium-catalyzed N-vinylation of azaheterocycles with vinyl triflates is described. Cyclic and acyclic vinyl triflates along with nonnucleophilic azaheterocycles were found to be substrates for this palladium-catalyzed synthesis of N-vinyl pyrrole and indole derivatives.

Protonation of the highly reactive 1:1 intermediates, produced in the reaction between triphenylphosphine and acetylenic esters, by NH-acids such as azathioprine, imidazole or theophylline leads to the formation of vinyltriphenylphosphonium salts, which undergo a Michael addition reaction with a conjugate base to produce phosphorus ylides. Silica nanoparticles (silica NPs were prepared by therm...

By reaction of a 1-unsubstituted imidazole (imH) with alkali and R 3'PAuC1 under phase trans­ fer conditions or in M eO H solution R3'PAu (im-./V) compounds were obtained where R' = C6H n or r-Bu, and imH was imidazole, 2-/-Pr-, 4 -N 0 2-imidazole or benzimidazole. When the Ph,Sb (or Ph3As) hom ologue was reacted, polymeric [u-(2-methylimidazolato-Ar,/V')gold(I)]„ was obtained, together with (P...

The title complex, [Fe(C(19)H(27)N(10))](ClO(4))(3)·2H(2)O, is a new polymorph of an iron(II) Schiff base complex of tris-(2-amino-ethyl)methyl-ammonium with imidazole-2-carboxaldehyde. The octa-hedral Fe(II) atom is bound to three facial imidazole N atoms with average Fe-N(imidazole) and Fe-N(imine) bond distances of 1.963 (5) and 1.951 (5) Å, respectively. The central N atom of the tripodal l...