Marziye Mansouri - School of Chemistry, Damghan University Damghan, Iran
Seied Ali Pourmousavi - School of Chemistry, Damghan University Damghan, Iran, Institute of Biological Science, Damghan University Damghan, Iran
Zahra Hoseien Abadi - School of Chemistry, Damghan University Damghan, Iran

Much attention has been focused on Heterogeneous catalysts, since these catalysts can be recovered and reused several times after the reaction without loss of activity.Among the heterogeneous solid acid catalyst in organic synthesis, Carbon base solid acids (CBSAs), are important materials with many practical and research applications[1-2]. In continuation of our research on the synthesis of heterogeneous acid catalyst [3-5], in this report the synthesis of sulfonated carbon-based solid acid nanocatalyst(SCH-SO3H) has been investigated through the one-step hydrothermal reaction of Starch, sodium 2-Hydroxyethansulfonat as sulfonating agent in the presence of citricacid and HCl (Scheme). The structures and morphology of the prepared nanocatalyst were studied with SEM, IR, XRD, CHNS analysis. Also acidity of nanocatalyst was determined by acid-base titration. The application of SCH-SO3H was investigated in the one-pot synthesis of polyhydroquinoline through the reaction between dimedone,benzaldehyde, ethylacetoacetat and ammonium acetatein EtOH as green solventat room temperature. A variety of aldehydes were used to afford the correspondingproducts in good to high yields.