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Abstract
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A three‑dimensional walnut‑like Zn‑based MOF microsphere system was designed and synthesized via hydrothermal reaction of zinc salt with 4,6‑diamino‑2‑pyrimidinethiol as a tridentate ligand. Besides, Zn ions were coordinated to the functional groups of the ligand to give a novel Zn‑MOF microsphere material. Afterward, the resultant material was thoroughly characterized using various analysis and physico‑chemical methods; including, FT‑IR, XRD, TGA, EDX, X‑ray mapping, SEM, TEM, and BET analysis. The Zn‑MOF microspheres were utilized in the Hantzsch reaction for a selective synthesis of asymmetric polyhydroquinolines, using various aromatic aldehydes. Our strategy aims at providing a controlled synthesis of hierarchically nanoporous Zn‑MOF microspheres with a well‑ defined morphology, structure, and excellent catalytic properties. Besides, it would result in having a promising heterogeneous catalyst for a selective synthesis with good yields, short reaction time, a low limit of steric hindrance and electronic effects. Moreover, the heterogeneity of the catalyst is further tested with hot filtration and also the reusability results point.
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