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Table 3 Comparison of the efficiency of Fe3O4@PVA-SO3H with that of other reported catalysts in the synthesis of model 4a

From: Design and preparation of Fe3O4@PVA polymeric magnetic nanocomposite film and surface coating by sulfonic acid via in situ methods and evaluation of its catalytic performance in the synthesis of dihydropyrimidines

Entry Catalyst Conditions Time Yield (%) Ref
1 SnCl2/nano SiO2 EtOH/reflux 40 min 94 [31]
2 Silica-bonded N-propyl sulfamic acid (SBNPSA) EtOH/reflux 3–4 h 90–95 [32]
3 nanoZnO (5 mol %) Solvent free/60 °C 10 h 95 [33]
4 NH4H2PO4 (5 mol %) or NH4H2PO4/SiO2 Solvent free/100 °C 2 h 85 [34]
5 Fe3O4@mesoporous SBA-15 EtOH/65 °C 6 h 85 [35]
6 Fe3O4@PVA-SO3H (50 mg) EtOH/reflux 10 min 99 This work
  1. aIsolated yield