An alumino-silicate zeolite, Linde Type-A (LTA) has been prepared from aluminium powder and sodium metasilicate by hydrothermal process. The zeolite was characterized by FTIR and X-ray diffraction (XRD) analysis and by measuring the surface acidity using KOH as adsorbate. The surface acidity of LTA zeolite varied greatly with varying synthesized conditions such as crystallization temperature, c...

A convenient and efficient direct protocol for the preparation of antibacterial azo dyes by the reaction of 2-naphthol with aromatic amines in the presence of catalytic amount of N-methyl-2-pyrrolidonium hydrogen sulfate ([H-NMP]HSO4) was carried out under solvent free conditions. This method has some advantages such as: easy work-up and easy separation of catalyst from the reaction mixture. Th...

It was found 1 that Ro ... 0 distances in cyclic dimers of p-substituted benzoic acids in the crystalline state do not follow the Hammett rule. The Ro ... 0 values often serve as an approximate measure of hydrogen bond strength.2 Since substituent constants op and R0 ... 0 express the Bronsted and the Lewis acidity of the carboxylic group in solution and in the crystalline state, respectively, ...

A new superacid, H(CB11H6X6) (where X = chlorine or bromine), whose conjugate base is the exceptionally inert CB11H6X6- carborane anion, separates Bronsted acidity from oxidizing capacity and anion nucleophilicity in a manner not previously achieved. Reaction of this superacid with C60 gives HC60+ as a stable ion in solution and in the solid state. In a separate experiment, an oxidant was devel...

Levulinic acid (LA) is one of the top twelve chemicals listed by US Department Energy that can be derived from biomass. It serves as a building block and platform chemical for producing variety chemicals, fuels materials which are currently produced in fossil based refineries. LA key strategic chemical, fuel grade plastic substitutes its catalytic conversion. derivatisation to various product s...

in the present of methylimidazolium hydrogen sulfate, the synthesis of arylidene heterobicyclic pyrimidinones is studied by condensation of aromatic aldehyde, cyclopentanone, and urea or thiourea. using solvent-free conditions, non-toxic and inexpensive materials, simple and clean work-up, short reaction times and good yields of the products are the advantages of this method.