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Highly Effective Brønsted Base/Lewis Acid Cooperative Catalysis: A new Cd metal-organic framework for synthesis of Hantzsch 1, 4-DHPs at ambient temperature

Abstract

A new 3D metal-organic framework {[Cd3(BDC)3(OPP)(DMF)2].2DMA}n (TMU-33) has been synthesized by using a novel V-shaped imine functionalized ligand N,N'-(oxybis(4,1-phenylene))bis(1-(pyridin-4-yl)methanimine) (OPP), therphtalic acid (H2BDC), Cd(NO3)2.4H2O and was full characterized. Operation of imine function of OPP ligand as a Brønsted base and open Cd site as a Lewis acid in this framework was investigated in the role of cooperative catalyst for synthesis of Hantzsch 1,4-dihydropyridines simultaneously and separately at ambient temperature. In addition, nanorods and nanoplates of TMU-33 via sonochemical reaction were synthesized by the coordination modulation method and its effect on the relative access of each catalytic sites was studied. Also, catalytic performance of different morphologies of TMU-33 in this reaction was evaluated. High and fast catalytic activity is observed in nanoscale catalysts at ambient temperature and the acidic sites in this cooperative catalyst are more effective than the existing base in the structure. TMU-33 can be reused by washing with ethanol for at least four times without significant degradation of catalytic activity (less than 7%).

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Publication details

The article was received on 19 May 2017, accepted on 06 Nov 2017 and first published on 07 Nov 2017


Article type: Paper
DOI: 10.1039/C7NJ01509G
Citation: New J. Chem., 2017, Accepted Manuscript
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    Highly Effective Brønsted Base/Lewis Acid Cooperative Catalysis: A new Cd metal-organic framework for synthesis of Hantzsch 1, 4-DHPs at ambient temperature

    F. Rouhani and A. Morsali, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ01509G

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