synthesis of 14h-dibenzo xanthene derivatives using choline chloride/tin(ii) chloride deep eutectic solvent and fe3o4/ƛ-carrageenan/zn(ii)

In this study, various xanthene derivatives have prepared efficiently through a simple method using choline chloride/tin(ii) chloride (chcl·2sncl2) deep eutectic solvent (des), alone, or in the presence of fe3o4/ƛ-carrageenan/zn(ii) magnetic bionanocatalyst. in the employed procedure, 2-naphthol derivatives have mixed with aromatic or aliphatic aldehydes and the reactions have been completed in the presence of des at 90 °c in 1.5 h. in addition, using des/fe3o4/ƛ-carrageenan/zn(ii), the reaction time was reduced to 30 min. the employed des has been recycled four times without important loss of its activity.