New process technologies are disclosed to manufacture aluminium fluoride of high density and anhydrous hydrofluoric acid starting from fluosilicic acid as raw material which is obtained during acidulation of phosphate rock in the manufacture of phosphatic fertilizers. An overview of the relevant...

This study focuses on the thermal oxidation of model composites of insulating materials based on a cross-linked mixture of EVA (Ethylene Vinyl Acetate) and EPDM (Ethylene Propylene Diene Monomer) highly loaded (60 wt %) with ATH (Aluminium TriHydrate) filler. A thorough analysis of the material ...

The hydrothermal decomposition of AlF3.3H2O in water suspension was investigated by chemical and X-ray analyses at temperatures ranging from 114 to ca. 143°C. It was found that this process runs from a trihydrate to a monohydrate composition according to a zero order rate equation to give subse...

AlF3 is a strong Lewis acid and several hydrates of it are known, namely the monohydrate, the trihydrate (of which two polymorphs have been described) and the nonohydrate, which forms in the abundance of water, as well as a more complex fluoride of composition Al0.82□0.18F2.46(H2O)0.54 whose st...

The rates of growth and dissolution of aluminium fluoride trihydrate crystals, AlF3·3H2O, in aqueous solution were measured as a function of the saturation ratio S = CCs (0

The thermal decomposition of aluminum fluoride trihydrate was investigated by TG-DTG. The process was recognized to involve three stages: IAlF3·3H2O→108–277°CAlF3·0.5H2O+2.5H2O

The mechanism of inhibition of the Schizosaccharomyces pombe plasma membrane H+-ATPase by fluoroaluminates has been investigated. A biphasic inhibitory process was observed at pH 7.5, with a preference for the AlF4− species. The dissociation constant found for AlF4− is 8.5 μM, Mg2+ being an ess...

Fluoroaluminate is a G-protein activator, it stimulates osteoblastic cells in culture, and is a bone-forming agent in vivo. To elucidate the mechanisms of G-protein-mediated action of fluoroaluminate in osteoblasts, we studied protein tyrosine phosphorylation in the preosteoblastic cell line MC3...

The reaction of aluminum fluoride solution with crystalline sodium fluoride was investigated. Conditions for the formation of Na3AlF6 (cryolite), Na5Al3F14 (chiolite) and NaAlF4.H2O were established. The hitherto presumed to be unstable NaAlF4.H2O was isolated and its X-ray diffraction data as w...

Single barnacle muscle fibers from Balanus nubilus were used primarily to examine the validity of two ideas: first, that the injection of KF stimulates the ouabain-insensitive Na+ efflux, and that this action is potentiated by adding AlCl3 (Al) in a low concentration to the solution of KF prior ...

Fluoroaluminates are well known glass formers. Although their glass forming ability is low, it can be increased by doping with phosphates. Structure and properties depend mainly on the fluoride to phosphate ratio. In this review a number of recent developments in the use of these glasses for the...

A series of phenyl N-(2-aminoethyl)carbamates derived from various substituted ethyl diamines and phenol was prepared and evaluated as prodrug forms with the aim of protecting phenolic drugs against first-pass metabolism. The stability of the compounds was studied in aqueous buffer solutions and...

Syntheses of fourteen new 3-(arylamino)-1-ferrocenylpropan-1-ones have been achieved in good to excellent yields by an aza-Michael addition of different arylamines to acryloylferrocene. The reaction was performed by microwave (MW) irradiation (500 W/5 min) of a mixture of reactants and montmoril...

Dihydropyrimidinone azides 1, obtained from trimethylsilyl chloride-catalyzed Biginelli reaction of 2-azidobenzaldehyde, ethyl acetoacetate, and urea (or thiourea) at room temperature, reacted with triphenylphosphine to give iminophosphorane 2. A tandem aza-Wittig reaction of iminophosphorane 2 ...

An expedient four-step approach for the synthesis of a short library of original analogues of the Topo-I Luotonin-A inhibitor, substituted at their C8- and N15-positions, was investigated. This consists of Rutaecarpines formation, their Witkop–Winterfeldt oxidation followed ultimately with func...

N-Allyl-N-methylanilines react with methyl diazoacetate or diazoacetone in the presence of Y, Sc or Sm triflates to give the corresponding methyl N-(2-allylaryl)-N-methylglycinates or 2-allyl-N-methyl-N-(2-oxopropyl)aniline. The formation of these compounds involves the aza-Claisen rearrangement.

A Kornblum-DeLaMare/aza-Michael reaction of 3,6-dihydro-1,2-dioxines with primary and secondary amines has been developed which affords 4-hydroxy-3-aminoketones. The aza-Michael products were reduced using non-selective NaBH4/MeOH or diastereoselective (up to 92:8) SnCl4/NaBH4 conditions yieldin...

A series of 5-aza-9-deaza- analogues of purine was effectively prepared using highly selective annulation of 1,3,5-triazine ring onto 5-aminopyrazole-4-carboxylates via a one-pot, multicomponent, microwave-assisted approach. The products were obtained in good yields and high purity. This catalys...

Magnesium alkylidene carbenoids were generated from 1-chlorovinyl p-tolyl sulfoxides with i-PrMgCl at −78 °C in THF or toluene via the sulfoxide–magnesium exchange reaction. Reaction of the generated magnesium alkylidene carbenoids with lithium acetylides or lithium thiolates gave conjugated e...

The synthesis and photophysical properties of a series of π-conjugated vinyl sulfides are described. These compounds exhibited their absorption maxima in the range of 350–366 nm, while the emission spectra displayed peaks in the zone of 421–441 nm; both of them were influenced, although in di...