Nano titania-supported sulfonic acid catalyzed synthesis of α,α′-bis(substituted-benzylidene)cycloalkanones and of their xanthene derivatives under solvent-free conditions

Abstract

Full paper/Me ´moire Nano titania-supported sulfonic acid catalyzed synthesis of a,a 0 -bis(substituted-benzylidene)cycloalkanones and of their xanthene derivatives under solvent-free conditions

A convenient, simple and one-pot synthesis of dibenzoxanthenes and tetrahydrobenzoxanthenes by nanotitania-supported sulfonic acid as an efficient and highly reusable nanocatalyst

“…In recent years, special attention has been paid to the preparation, characterization and catalytic investigation of sulfonic acid functionalized supports as effective solid acid catalysts for organic synthesis [3][4][5][6]. Recently, we have reported nanotitania-supported sulfonic acid (n-TSA) [7] as an effective heterogeneous acidic nanocatalyst for the promotion of a wide range of organic reactions [8,9] as for its Lewis and Brønsted acidity features. The ease of preparation, simple work-up procedures, improved product yields, great ease of purification, short reaction times, mild reaction conditions, recyclability and high turnover number (TON) of the catalyst are the main superiorities of n-TSA.…”

Design, characterization, and use of N,N-diethyl-N-sulfoethanaminium hydrogen sulfate {[Et3N-SO3H]HSO4} as a novel and highly efficient catalyst for preparation of α,α′-bis(arylidene)cycloalkanones

“…Cross-aldol condensation reaction between cycloalkanones and arylaldehydes has been used as the best synthetic route toward a,a 0 -bis(arylidene)cycloalkanones [29][30][31][32][33][34][35][36][37]. Several catalysts have been used to promote this transformation so far [29][30][31][32][33][34][35][36][37].…”

One-pot, solvent-free and efficient synthesis of 2,4,6-triarylpyridines catalyzed by nano-titania-supported sulfonic acid as a novel heterogeneous nanocatalyst

“…Considering our researches toward evaluating the catalytic activity of n-TSA for the synthesis of organic compounds [9,23], we have investigated the synthesis of 2,4,6-triarylpyridines (4-7) via one-pot, three-component cyclo-condensation reaction of acetophenones (1), aldehydes (2) and ammonium acetate (3) To choose the most appropriate condition in this reaction and to understand the influence of different variables, several experiments were studied. Initially, we optimized the amount of catalyst in order to find the required catalyst load.…”