a convenient and efficient procedure for the synthesis of 14-aryl or alkyl-14h-dibenzo[a,j]xanthenes by condensation of 2-naphthol and aldehydes in the presence of methylimidazolium hydrogensulfate, as a brönsted acidic ionic liquid ([hmim]hso4), is described. both aromatic and aliphatic aldehydes reactedeasily to afford the corresponding 14-aryl or alkyl-14h-dibenzo[a,j]xanthenes in good yield...

A convenient and efficient procedure for the synthesis of 14-aryl or alkyl-14H-dibenzo[a,j]xanthenes by condensation of 2-naphthol and aldehydes in the presence of Methylimidazolium hydrogensulfate, as a Brönsted acidic ionic liquid ([Hmim]HSO4), is described. Both aromatic and aliphatic aldehydes reacted easily to afford the corresponding 14-aryl or alkyl-14H-dibenzo[a,j]xanthenes in good yiel...

Grafting of 3-aminopropyltriethoxysilane (APTS) on graphene oxide (GO) nanosheets followed by reaction with phosphotungstic acid (H3PW12O40, denoted as H3PW) gave a new functionalized GO which was characterized using FT-IR, FESEM, EDX, EDX elemental mapping and ICP-OES techniques. The catalytic activity of this nanomaterial containing phosphotungstic counter-anion H2PW12O40¯ (H2PW) which was de...