Synthesis of 2,3-dihydroquinazolin-4(1H)-ones using H3BO3/montmorillonite K10 (H3BO3/mont K10) catalyst has been reported. H3BO3/mont K10 and H3BO3/mont K30 have been prepared and used as catalysts in the reaction between anthranilamide and benzaldehyde to prepare 2-phenyl...

A number of SO3H-functionalized solids (biochar, montmorillonites, carbon and halloysite nanotubes) has been studied as catalysts in the cascade Prins-Ritter reaction (-)-isopulegol with benzaldehyde acetonitrile for synthesis octahydro-2H-chromene amides (as 4R- 4S-isomers). high selectivity to these products at 30 °C presence H2O was observed on modified chlorosulfonic acid (CSA) reaching 84%...

-Interlayer cations and moisture content greatly influence the molecular vibrations of H20 in montmoriUonite as shown through reflectance spectroscopy in the infrared. The absorptions due to H~O have been studied in montmorillonites exchanged with H, Na, Ca, Mg and Fe 3+ interlayer cations under variable moisture environments. Band assignments have been made for absorptions in the 3 ~tm region ...

-When 1-hexene was adsorbed by Cr3+-montmorillonite at room temperature, all evidence of C=C(str) vibrations was lost. Protonation of the alkene occurred, and the secondary carbocation formed was bound at a site on the primary coordination sphere of the interlayer cation. Some of the hydrogen atoms of these primary-sphere water molecules were involved in strong hydrogen bonds to the silicate sh...

Abstract. Heterogeneous ice nucleation on dust particles in the atmosphere is a key mechanism for formation clouds. However, conditions of particle surface efficient are poorly understood. In this study, we present results immersion freezing experiments using differential scanning calorimetry emulsified mineral suspensions, involving two chemically identical, but morphologically different, kaol...