Preparation of Polydopamine Sulfamic Acid-Functionalized Silica Gel as Heterogeneous and…
Table 3 Comparison efficiency
Entry
Reaction conditions
Time
Yield (%)
References
of SiO
2/PDA–SO3H with
some reported catalysts for the
acetylation reactions of benzyl
alcohol
1
2
3
4
5
6
7
8
9
SiO2/PDA–SO3H, r.t., solvent-free
ZnCl2, r.t., solvent-free
Borated zirconia, 110 °C, toluene
SiO2–ZnCl2, 80 °C, CH3CN
Silica sulfamic acid, r.t., solvent-free
Yttria-zirconia, 110 °C, solvent-free
Copper zirconium phosphate NPs, 60 °C, solvent-free
Nano γ-Fe2O3, sonication, r.t., solvent-free
CuO–ZnO, r.t., CH2Cl2
30 min
3 h
14 h
3 h
15 min
6 h
30 min
1 h
15 min
96
63
25
90
93
94
91
64
92
This work
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Acknowledgements We are thankful to Payame Noor University, Teh-
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