Urea-Functionalized Self-Assembled Molecular Prism for Heterogeneous Catalysis in Water

Journal of the American Chemical Society
Prodip HowladerPartha Sarathi Mukherjee

Abstract

Reaction of a ditopic urea "strut" (L1) with cis-(tmen)Pd(NO3)2 yielded a [3+3] self-assembled molecular triangle (T) [L1 = 1,4-di(4-pyridylureido)benzene; tmen = N,N,N',N'-tetramethylethane-1,2-diamine]. Replacing cis-(tmen)Pd(NO3)2 in the above reaction with an equimolar mixture of Pd(NO3)2 and a clip-type donor (L2) yielded a template-free multicomponent 3D trigonal prism (P) decorated with multiple urea moieties [L2 = 3,3'-(1H-1,2,4-triazole-3,5-diyl)dipyridine]. This prism (P) was characterized by NMR spectroscopy, and the structure was confirmed by X-ray crystallography. The P was employed as an effective hydrogen-bond-donor catalyst for Michael reactions of a series of water-insoluble nitro-olefins in an aqueous medium. The P showed better catalytic activity compared to the urea-based ligand L1 and the triangle T. Moreover, the confined nanospace of P in addition to large product outlet windows makes this 3D architecture a perfect molecular vessel to catalyze Diels-Alder reactions of 9-hydroxymethylanthracene with N-substituted maleimide in the aqueous medium. The present results demonstrate new observations on catalytic aqueous Diels-Alder and Michael reactions in heterogeneous fashion employing a discrete 3D architectu...Continue Reading

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Citations

Jul 28, 2016·Journal of the American Chemical Society·Dan PrestonJames D Crowley
Sep 28, 2016·Journal of the American Chemical Society·Zhixuan ZhouPeter J Stang
Sep 23, 2016·Journal of the American Chemical Society·Witold M BlochGuido H Clever
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Mar 3, 2017·Inorganic Chemistry·Bijan RoyPartha Sarathi Mukherjee
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