One-pot three-component synthesis of 1,8-dioxooctahydroxanthenes and 14-Aryl-14Hdibenzo[a,j]xanthenes using a new nanostructure zeolite

Zr(HSO4)4: Green, efficient and reusable catalyst for one-pot synthesis of 1,8-dioxooctahydroxanthene under solvent-free conditions

“… Entry Catalyst Conditions Reaction time (min) Yields% Ref. 1 PEG H 2 O/reflux ∼ 180 ∼ 90 [39] 2 activated zinc metal and solid NH 4 C Solvent free /MW ∼ 50 ∼ 90 [40] 3 1-butyl-3-methylimidazoliumtetrafluoroborate (BMIF) solvent free/∼200 ˚C ∼ 60 ∼ 90 [41] 4 Fe nanoparticles loaded in zeolite X (Fe-X) Solvent-free, 90°C ∼ 40 ∼ 90 [42] 5 SO 3 H@Fe 3 O 4 magnetic nanocatalyst Solvent-free, 80 ˚C ∼ 20 ∼ 90 [43] 6 Zr(HSO 4 ) 4 Solvent-free, 110°C 35-60 72-95 This work …”