%0 Journal Article
%T ZINC OXIDE NANOPARTICLES: AN ENVIRONMENTALLY BENIGN AND REUSABLE CATALYST FOR THE SYNTHESIS OF 1,8-DIOXOOCTAHYDROXANTHENE DERIVATIVES UNDER SOLVENT-FREE CONDITIONS Zinkoxid-Nanopartikeln: AN umweltfreundliche und WIEDERVERWENDBAR Katalysator f¨¹r die Synthese von 1,8-DIOXOOCTAHYDROXANTHENE Derivate unter l sungsmittelfreien Bedingungen
%A G. B. Dharma Rao
%A M. P. Kaushik
%A A. K. Halve
%J Heterocyclic Letters
%D 2012
%I Raman Publications
%R april 5, 2012
%X Zinc oxide nanoparticles (ZnO-NPs) as an environmentally benign and reusable heterogeneous catalysts for the synthesis of series of biologically significant 1,8-dioxo-octahydroxanthene derivatives. This has been accomplished by the condensation of various aldehydes with 5,5- Dimethyl-1,3-cyclohexanedione using ZnO-NPs as an environmentally benign heterogeneous catalyst. ZnO-NPs catalyst exhibited remarkable catalytic activity to achieve the synthetic targets in the range of 80-93% yield under solvent-free condition. ZnO-NPs could be used up to four cycles with similar catalytic response. The protocol provided greater selectivity, cost-efficiency, clean reaction profiles, simple work-up procedure and high yields.
%K 1
%K 8-dioxo-octahydroxanthene
%K 5
%K 5-Dimethyl-1
%K 3-cyclohexanedione
%K Aldehyde
%K Zinc oxide nanoparticles
%K Heterogeneous catalyst.
%U http://heteroletters.org/issue24/5.html