naa a22 4500 510734057 CHVBK 20180411083003.0 cr unu---uuuuu 180411e20130501xx s 000 0 eng 10.1007/s12039-013-0408-8 doi (NATIONALLICENCE)springer-10.1007/s12039-013-0408-8 Polymer supported sulphanilic acid: A highly efficient and recyclable green heterogeneous catalyst for the construction of 4,5-dihydropyrano[3,2-c]chromenes under solvent-free conditions [Elektronische Daten] [JASHMIN PATEL, JEMIN AVALANI, DIPAK RAVAL] Polystyrene divinylbenzene supported sulphanilic acid was prepared, characterized and tested as an acidic catalyst in multicomponent organic synthesis. This is the first report focusing on the development of one-pot solvent-free synthesis of 4,5- dihydropyrano [3,2-c]chromenes under acidic conditions. It proved to be a versatile catalyst for microwave-assisted synthesis of 4,5-dihydropyrano[3,2-c]chromenes. This methodology is mild, high yielding, green and the catalyst could be easily recycled for several times. Graphical Abstract Polystyrene divinylbenzene supported sulphanilic acid was prepared, characterized and applied as a novel heterogeneous catalyst in heterocyclic synthesis. A comparative study of the synthesis of chromenes under microwave irradiation and conventional techniques using the prepared catalyst has been made. Indian Academy of Sciences, 2013 Heterogeneous catalyst nationallicence microwave nationallicence chromenes nationallicence solvent free nationallicence multi-component nationallicence PATEL JASHMIN Department of Chemistry, Sardar Patel University, 388 120, Vallabh Vidyanagar, India aut AVALANI JEMIN Department of Chemistry, Sardar Patel University, 388 120, Vallabh Vidyanagar, India aut RAVAL DIPAK Department of Chemistry, Sardar Patel University, 388 120, Vallabh Vidyanagar, India aut Journal of Chemical Sciences Springer-Verlag 125/3(2013-05-01), 531-536 0974-3626 125:3<531 2013 125 12039 https://doi.org/10.1007/s12039-013-0408-8 text/html Onlinezugriff via DOI 1 brief-communication jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12039-013-0408-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- PATEL JASHMIN Department of Chemistry, Sardar Patel University, 388 120, Vallabh Vidyanagar, India aut NATIONALLICENCE 700 1- AVALANI JEMIN Department of Chemistry, Sardar Patel University, 388 120, Vallabh Vidyanagar, India aut NATIONALLICENCE 700 1- RAVAL DIPAK Department of Chemistry, Sardar Patel University, 388 120, Vallabh Vidyanagar, India aut NATIONALLICENCE 773 0- Journal of Chemical Sciences Springer-Verlag 125/3(2013-05-01), 531-536 0974-3626 125:3<531 2013 125 12039 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer