Optically active isatin-derived N,O-aminals were obtained through the catalytic asymmetric addition of various alcohols to isatin-derived N-Boc ketimines. Using 2′-phenyl cinchonidine thiourea as the catalyst, adducts were obtained in 96% yield and with up to 92% ee.

The catalytic asymmetric addition of arylboronic acids to N-Boc imines generated in situ from stable and easily prepared α-carbamoyl sulfones was realized by using chiral cationic C2-symmetric N-heterocyclic carbene (NHC) Pd2+ diaquo complexes 1a–c as the catalysts, producing the corresponding...

We herein present an efficient method for the construction of α,α-difluoro-β-hydroxy ketones. The La(OTf)3-catalyzed aldol reaction between difluoroenol O-Boc (Boc = tert-butyloxycarbonyl) esters and carbonyl compounds affords α,α-difluoro-β-hydroxy ketones in good yield. The key reagents ...

4-Chloro-3-(trifluoroacetyl)- and 4-chloro-3-(methoxalyl)coumarins react with electron-rich aminoheterocycles, dimethyl 1,3-acetonedicarboxylate, hydrazines, alkyl thioglycolates, and methyl sarcosinate to give a variety of 3,4-heteroannulated coumarins. The starting materials were prepared by t...

A versatile porous adsorbent of sulfonated polystyrene/ferrosoferric oxide/diazoresin (SPS/Fe3O4/DR) nanocomposite microspheres with magnetic property and acidic/basic groups was prepared and applied for removal of different dyes from water. The adsorbent showed good adsorption performance due t...

A series of polysulfone–ferrosoferric oxide (Fe3O4) ultrafiltration membranes with different amounts of ferrosoferric oxide were prepared from suspensions using the phase inversion process. The suspensions consisted of polysulfone, N,N-dimethylacetamide, poly(vinylpyrrolidone), and ferrosoferri...

A one-pot synthesis of 1,2-disubstituted 2-imidazolines from N-(2-haloethyl)amides has been developed. The reaction affords high yields of diverse 1,2-disubstituted 2-imidazolines from triflic anhydride-mediated dehydration of amides followed by installation of a primary amine.

Chiral alcohols are important as bioactive compounds or as precursors to such molecules. On the basis of the different antifungal properties of the enantiopure alcohol derivatives of 4′-chlorophenyl cyclopropyl ketone and benzyl 4′-chlorophenyl ketone, their enantioselective synthesis by chemi...

Due to wide variety of biological and pharmacological activities of benzimidazole derivatives, the terahertz fingerprint spectra of 2-(4-fluorophenyl)benzimidazole and 2-(4-chlorophenyl)benzimidazole are researched by employing terahertz time-domain spectroscopy and density functional theory sys...

For TNP chemosensor 2-(4,5-Bis(4-Chlorophenyl)-1H-Imidazol-2-yl)-4-Chlorolphenol (HPICI), previous thought with no theoretical basis was that excited-state intramolecular proton transfer (ESIPT) process and the ground-state HPICI-TNP complex are mainly responsible for its fluorescence emission a...

The condensation reaction of equimolar benzenesulphonohydrazide and 2-carboxybenzaldehyde gave the Schiff base 2-{[2-(phenylsulfonyl)hydrazinylidene]methyl}benzoic acid (BSHOPA). The reaction of 2-{[2-(phenylsulfonyl)hydrazinylidene]methyl}benzoic acid with dysprosium(III)acetatetetrahydrate gav...

Bis(4-cyanophenyl) phenyl phosphate (CPP) is introduced for the first time as a viscosity reducing comonomer for phthalonitrile resins. In comparison to the common phthalonitrile resins, the blends of CPP with 4,4′-[benzene-1,3-diylbis(oxy)]diphthalonitrile demonstrated advanced processing prop...

Hybrid ceramic materials with amine function are prepared from aminopropyltriethoxysilane or bis(trimethoxysilylpropyl)amine as aminopropyl group bearing polysiloxane precursors. Methyl and methyl phenyl polysiloxane precursors are used to influence the hydrophobicity of the material. The materi...

The corrosion resistance of AA 2024-T3 and hot-dip galvanized steel (HDG) was studied after treatment with bis-[3-(triethoxysilyl)propyl]tetrasulfide (bis-sulfur silane), bis-[trimethoxysilylpropyl]amine (bis-amino silane), and their mixture. Electrochemical tests in neutral 0.6 M NaCl as well a...

The adsorption of strontium and calcium ions by composite magnetic particles derived from Fe3O4 and bis(trimethoxysilylpropyl)amine (TSPA) were comparatively studied. The effects of initial solution pH, ionic strength, initial strontium and calcium ion concentration, and temperature on the equil...

Functional organosilanes are powerful interface-active agents that find applications as adhesion promoters as well as optical, dielectric and protective coatings. Bis-silanes are of particular interest because they are highly crosslinked leading to very robust films. In almost all applications, ...

An organic/inorganic hybrid gel was prepared with tetraethoxysilane (TEOS) and bis(trimethoxysilylpropyl)amine (TSPA) as precursors. The adsorption of boron on the hybrid gel in aqueous solutions was investigated comprehensively by varying the initial boron concentration, pH, ionic strength, and...

The controlled release of sodium salicylate (SS) from the gels derived from bis(trimethoxysilylpropyl)amine (TSPA) or the mixture of TSPA with tetraethoxysilane (TEOS) was investigated. The experimental results suggest that the release of SS can be easily controlled by adjusting the ratio betwee...

A silane surface treatment based on the water soluble mixtures of bis-[trimethoxysilylpropyl]amine and vinyltriacetoxysilane has been developed with the aim of replacing conventional chromating processes in metal-finishing industries. A variety of performance tests were employed to evaluate the ...

The efficient synthesis of four benzyl 2-(S)-[(tert-butoxycarbonyl)amino]-ω-iodoalkanoates {benzyl 2-(S)-[(tert-butoxycarbonyl)amino]-3-iodopropanoate, benzyl 2-(S)-[(tert-butoxycarbonyl)amino]-4-iodobutanoate, benzyl 2-(S)-[(tert-butoxycarbonyl)amino]-5-iodopentanoate, benzyl 2-(S)-[(tert-buto...