South African Journal of Chemistry
On-line version ISSN 1996-840X
SAFAEI-GHOMI, Javad; GHASEMZADEH, Mohammad Ali and ZAHEDI, Safura. FeCl3.nano SiO2: An efficient heterogeneous nano catalyst for the synthesis of 14-aryl-14H-dibenzo[a,j]xanthenes and 1,8-dioxo-octahydro-xanthenes under solvent-free conditions. S.Afr.j.chem. (Online) [online]. 2012, vol.65, pp. 191-195. ISSN 1996-840X.
A novel, efficient and eco-friendly procedure for the synthesis of 14-aryl-14H-dibenzo[a,j]xanthenes and 1,8-dioxo-octahydroxanthenes is described through one-pot condensation of 2-naphthol and dimedone with aryl aldehydes in the presence of nano silica-supported ferric chloride under solvent-free conditions. The present approach offers several advantages such as short reaction times, high yields, easy purification, recovery and reusability of the catalyst.
Keywords : Xanthenes; nano silica; ferric chloride; multi-component reactions; solvent-free.