bis(indolyl)methanes are important group of bioactive metabolites of terrestrial and marine regions. they were synthesized by different methods. herein, a clean, one-pot synthesis of bis(indolyl)methane derivatives by cyclo-condensation reaction of indole and various aldehydes using sulfonic acid functionalized silica (sio2-pr-so3h) in aqueous media is reported. the advantages of this new metho...

Taurine is the most abundant free amino acid in the heart. However, unlike the classical β-amino acids, taurine is a β-amino acid with the acid moiety being a sulfonic acid group rather than a carboxyl group; the lack of a carboxyl group excludes the involvement of taurine in peptide bond formation. Nonetheless, there is abundant evidence that taurine is an essential nutrient in certain species...

A high-density sulfonic acid polymer, grafted onto a carrier surface, was synthesized from the acid form of vinylsulfonic acid monomer, and its catalytic activity as a new class of heterogeneous acid catalyst demonstrated in esterification reactions.

the microphase separation of hydrated perfluorinated sulfonic acid membrane nafion was investigated using dissipative particle dynamics (dpd). the nafion as a polymer was modelled by connecting coarse grained beads which corresponds to the hydrophobic backbone of polytetrafluoroethylene and perfluorinated side chains terminated by hydrophilic end particles of sulfonic acid groups [1, 2]. each f...

A fully hydrated Nafion membrane is generally treated as a three-component system comprising the tetrafluoroethylene-like main chain, fluorinated side chain ending with sulfonic acid group, a...

Friedel–Crafts synthesis of triarylmethanes over 3-methyl-1-sulfonic acid imidazolium tetrachloroaluminate under green conditions:In this work, Friedel–Crafts (FC) alkylation of various arenes with aromatic aldehydes catalyzed by 3-methyl-1-sulfonic acid imidazoliumtetrachloroaluminate {[Msim]AlCl4}, as a green catalyst, to prepare triarylmethanes (TAMs) has been carried out. Some aromatic alde...

Sulfonic acid functionalized SBA-15 as a nanoporous acid catalyst was used in the synthesis of 2-Aryl benzoxazoles 4 by the condensation of 2-aminophenol 1 and benzoyl chlorides 2 under microwave irradiation in solvent free reaction conditions. The advantages of this methodology are good product yields (60-98%), being environmentally benign, short reaction times and easy work up.