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- Title
Shedding Light on the Lewis Acid Catalysis in Organic Transformations Using a Zn-MOF Microflower and Its ZnO Nanorod.
- Authors
Gandhi, Shradha; Sharma, Vandana; Koul, Ishfaq S.; Mandal, Sanjay K.
- Abstract
The Lewis acidic nature of both {[Zn4(µ3-OH)2(d-2,4-cbs)2(H2O)4].5H2O}n(Zn-CBS) and its ZnO nanostructures (ZnO_1, 3D microflower; ZnO_2, 3D polyhedron; and ZnO_3, 1D nanorod) was explored for the comparative study of the C–C and C-N bond forming reactions, such as Knoevenagel condensation, Friedel–Crafts alkylation and Strecker reaction, with various substrates. Notably, the nanorod (ZnO_3) is found to be an exceptionally efficient heterogeneous catalyst in comparison to its parent Zn-CBS for the Knoevenagel condensation reaction showing 100% conversion in 15 min with only 2 mol% catalyst in methanol at 25 °C. Similar catalytic results were obtained in the multicomponent Strecker reaction where ZnO_3 showed an enhanced catalytic activity in water as compared to Zn-CBS. However, for the Friedel–Crafts alkylation reaction, Zn-CBS was better than ZnO_3. These highly efficient catalysts are recyclable for three consecutive runs without any notable change in the catalytic activity. Their mechanism of action for all three reactions is also explained.
- Subjects
LEWIS acids; NANORODS; ORGANIC acids; HETEROGENEOUS catalysts; ZINC oxide; FRIEDEL-Crafts reaction
- Publication
Catalysis Letters, 2023, Vol 153, Issue 3, p887
- ISSN
1011-372X
- Publication type
Article
- DOI
10.1007/s10562-022-04004-4