The first highly enantioselective hydrogenation of simple indoles was developed with a Brønsted acid as an activator to form the iminium intermediate in situ, which was hydrogenated using Pd(OCOCF(3))(2)/(R)-H8-BINAP catalyst system with up to 96% ee. The present method provides an efficient route to enantioenriched 2-substituted and 2,3-disubstituted indolines.

An efficient and convenient procedure for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones and thiones by condensation of 1,3-dicarbonyl compounds, Aromatic and aliphatic aldehydes, and urea or thiourea in the presence of catalytic amount of Brønsted acidic ionic liquid 3-methyl-1-sulfonic acid imidazolium chloride {[Msim]Cl} under thermal solvent-free conditions reacted easily to afford the co...

The study of the deactivation HY zeolites in dehydration reaction glycerol to acrolein has represented a challenge for design new catalysts. with SiO2/Al2O3 molar ratios between 3.5 and 80 were studied. solids characterized by XRD, N2 physisorption, SEM-EDXS, Raman UV-vis spectroscopies, infrared spectroscopy pyridine (FTIR-Py) catalytic activity tests from 250 °C 325 °C. It was found that tota...

A catalytic asymmetric procedure for the preparation of beta-amino acids (specifically beta-substituted aspartic acid derivatives) is reported. The cinchona alkaloid catalyst benzoylquinine (BQ) mediates up to five distinct steps of a reaction pathway, all in one reaction vessel. The products of this reaction, highly optically enriched beta-substituted aspartic acid derivatives, were prepared f...

A simple, efficient, and environmentally friendly method has been developed for the synthesis of a series of tricyclic fused pyrazolopyranopyrimidines via a one-pot three-component reaction of barbituric acids, aromatic aldehydes, and 3-methyl-5-pyrazolone in the presence of SBA-Pr-SO3H. SBA-15 mesoporous silica material functionalized with propyl sulfonic acid groups was used as a heterogeneou...

Dimerisation of alpha-olefins by a catalyst system comprising of a bis(imido) tungsten compound and a Lewis acid component has been investigated by density functional theory employing a catalyst model that closely mimics the real system together with ethylene chosen as a prototypical substrate. This study disclosed that the Lewis acid preferably forms four-membered chelates by bridging across t...

A simple, efficient, and environmentally friendly method has been developed for the synthesis of a series of tricyclic fused pyrazolopyranopyrimidines via a one-pot three-component reaction of barbituric acids, aromatic aldehydes, and 3-methyl-5-pyrazolone in the presence of SBA-Pr-SO3H. SBA-15 mesoporous silica material functionalized with propyl sulfonic acid groups was used as a heterogeneou...

Abstract MXenes are a new family of two-dimensional carbides and/or nitrides. Their 2D surfaces typically terminated by O, OH F atoms. Here we show that Ti 3 C 2 T x —the most studied compound the MXene family—is good acid catalyst, thanks to surface functionalities. We demonstrate this applying in epoxide ring-opening reaction styrene oxide (SO) and its isomerization liquid phase. Modifying ch...

Niobium oxide supported on ZrO2 and mixed of NbOx-ZrO2 was prepared characterized. Mechanical treatment followed by the microwave heating procedure catalysts with more advanced textural parameters. The amount Lewis (LAS) Brønsted (BAS) acid sites rose increasing Nb content in catalysts. catalytic properties samples niobia-zirconia (NbZr samples, NbZr catalysts) were studied a cellulose hydrolys...

Pyrolysis oil derived from waste tires consists of sulfur content in the range 7000 to 9000 ppm. For use diesel engines, its must be lowered 10 15 Though conventional hydrodesulfurization is suitable for removal tire pyrolysis oil, high cost provides an avenue alternative desulfurization technologies explored. In this study, oxidative (ODS), a low-cost technology, was explored oil. Two categori...