naa a22 4500 510735142 CHVBK 20180411083007.0 cr unu---uuuuu 180411e20130301xx s 000 0 eng 10.1007/s12039-013-0384-z doi (NATIONALLICENCE)springer-10.1007/s12039-013-0384-z SHESHMANI SHABNAM Department of Chemistry, Shahr-e Rey Branch, Islamic Azad University, P.O. Box 18155-144, Tehran, Iran aut Catalytic application of two novel sandwich-type polyoxometalates in synthesis of 14-substituted-14 H -dibenzo[ a , j ]xanthenes [Elektronische Daten] [SHABNAM SHESHMANI] Two sandwich-type polyoxometalates K12[As2W18Cu3O68]·30H2O and K12[As2W18U3O74]·21H2O were found to be as novel efficient catalysts for one-pot synthesis of various 14-aryl or alkyl-14H-dibenzo[a, j]xanthenes. Three-component condensation reactions of β-naphthol with aromatic or aliphatic aldehydes in the presence of these catalysts were investigated. These reactions were studied under different conditions such as solvent-free media using both conventional heating and microwave irradiation and also several solvents. Results showed that the optimum reaction time and the yield were obtained when reactions were carried out under solvent-free conditions. Furthermore, the catalysts could be recovered conveniently and reused efficiently. Graphical Abstract Three-component condensation reactions of β-naphthol with aromatic and aliphatic aldehydes in the presence of these catalysts were investigated. Results showed that the optimum reaction time and the yield were obtained when reactions was carried out under solvent-free conditions. Furthermore, the catalysts could be recovered conveniently and reused efficiently. Indian Academy of Sciences, 2013 14-Substituted-14 H -dibenzo[ a , j ]xanthenes nationallicence sandwich polyoxometalates nationallicence catalyst nationallicence solvent-free nationallicence Journal of Chemical Sciences Springer-Verlag 125/2(2013-03-01), 345-351 0974-3626 125:2<345 2013 125 12039 https://doi.org/10.1007/s12039-013-0384-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12039-013-0384-z text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- SHESHMANI SHABNAM Department of Chemistry, Shahr-e Rey Branch, Islamic Azad University, P.O. Box 18155-144, Tehran, Iran aut NATIONALLICENCE 773 0- Journal of Chemical Sciences Springer-Verlag 125/2(2013-03-01), 345-351 0974-3626 125:2<345 2013 125 12039 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer