Zirconium Metal‐Organic Framework (UiO‐66) as a Robust Catalyst toward Solvent‐Free Synthesis of Remarkable Heterocyclic Rings

Shaabani, Ahmad; Mohammadian, Reza; Hooshmand, Seyyed Emad; Hashemzadeh, Alireza; Amini, Mostafa M.

doi:10.1002/slct.201702410

Cited by 34 publications

(20 citation statements)

References 49 publications

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“…[34] Under the optimized reaction conditions, UiO-66 afforded 93 % yield of 3-(N-cyclohexyl) amine-2-phenylimidazo[1,2-a]pyridine at room temperature under solvent-free conditions (Scheme 3). These reactions generally imply condensation of two or more components, cyclization and aromatization, the last step being the driving force for these reactions.…”

Section: Reviewsmentioning

confidence: 99%

“…As an example, UiO-66 is a robust catalyst for the synthesis of various nitrogen-containing heterocycles, including imidazopyridines and pyridine derivatives. [34] Under the optimized reaction conditions, UiO-66 afforded 93 % yield of 3-(N-cyclohexyl) amine-2-phenylimidazo[1,2-a]pyridine at room temperature under solvent-free conditions (Scheme 3). Similarly, UiO-66 at 100°C under solvent-free conditions exhibited 91 % yield of 2,4,6-triphenylpyridine (Scheme 3).…”

Section: Nodes As Lewis Acidsmentioning

confidence: 99%

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Engineering UiO‐66 Metal Organic Framework for Heterogeneous Catalysis

et al. 2019

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frameworks (MOFs) are currently attracting considerable attention as heterogeneous catalysts at moderate temperatures, mainly for liquid-phase reactions. Since structural stability is one of the major concerns for the use of MOFs in catalysis, particularly considering that frequently some of the reported MOF materials are very unstable, the interest in this area has been focused on those MOFs exhibiting the highest structural robustness, UiO-66 being among the most widely used. Two introductory sections deal with the synthesis, structure and main properties of UiO-66, including its remarkable thermal (up to 350°C) and chemical (aqueous solution in a wide pH range) stability. The main body of the review summarizes those examples of using UiO-66 in catalysis grouped according to the nature of the active sites, starting with the use of UiO-66 as Lewis acids. In this section, emphasis has been made in the recent strategies to create structural defects in a controlled way that generate Lewis acidity. Other sections cover examples illustrating substituted terephthalate as active sites and the evidence that there is a synergy between acid and basic sites in close proximity that make some of these UiO-66 with substituents at the linker to act as dual acid-base catalysts. Other sections are focused on the use of UiO-66 as hosts of metal nanoparticles, metal oxides and other host, remarking the influence that the nature of UiO-66 and the possible presence of substituents in the framework play on the activity of the incorporated guest. The last section summarizes the current state of the art in the use of UiO-66 in catalysis and provides our views on future developments regarding the application of UiO-66 in industrial processes.

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Section: Reviewsmentioning

confidence: 99%

Section: Nodes As Lewis Acidsmentioning

confidence: 99%

Engineering UiO‐66 Metal Organic Framework for Heterogeneous Catalysis

et al. 2019

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“…UiO‐66 was also used by Shaabani and co‐workers for the synthesis of highly strained heterocyclic systems through a one‐pot coupling reaction. The synthesis and characterization of UiO‐66 have already been exhaustively discussed.…”

Section: Mofs For Coupling Reactionsmentioning

confidence: 99%

Engineering Metal–Organic Framework Catalysts for C−C and C−X Coupling Reactions: Advances in Reticular Approaches from 2014–2018

Kousik

Velmathi

2019

Chemistry A European J

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Metal-organic frameworks (MOFs) are ac lass of crystalline porousm aterials that have been activelyu sed for several industrial and synthetica pplications.M OFs are spatially and geometrically extrapolatedc oordination polymers with intriguing properties such as tunable porosity and dimensionality.Int erms of their catalytic efficiency,MOFs combine the easy recoverability of heterogeneous catalysts with the increased selectivity of biological catalysts. It is therefore not surprising that alot of work on optimizing MOF catalysts for organic transformationsh as been carriedo ut over the past decade. In this review,recent developments in MOF catalysis are summarized, with special attention being paid to CÀC, CÀN, and CÀOc oupling reactions. The influence of pore size, pore environment, and load on catalytic activity is described. Post-synthetics tabilization techniques and hostguest interactions in caged MOF scaffolds are detailed. Mechanistic aspects pertaining to the use of MOFs in asymmetric heterogeneousc atalysis are highlighted and categorized.

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“…The high chemical stability, large specific surface area, and adjustable pore structure of UiO-66 determine its wide range of applications, including gas adsorption and separation, [14][15][16] sensing, 17,18 and catalysis. 19 UiO-66 material has the merits of efficient conductivity and uniform distribution of active sites under specific modification and functionalization, which make it have great potential for PEM in DMFCs. 20 Nevertheless, the brittleness of UiO-66 not only makes it difficult to process but also results in poor long-range conductivity.…”

Section: Highlightsmentioning

confidence: 99%

Carbon nanocomposites self‐assembly UiO‐66‐doped chitosan proton exchange membrane with enhanced proton conductivity

et al. 2020

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Summary One‐dimensional (1D) sodium ligninsulfonate functionalized carbon nanotubes (SCNT), two‐dimensional (2D) graphene oxide (GO), and three‐dimensional (3D) zirconium‐based metal‐organic frameworks (UiO‐66) are self‐assembled as filler materials for proton‐exchange membranes (PEMs) because of their potential for extending proton transport pathways. Herein, UiO‐66‐SCNT and UiO‐66‐SCNT@GO were prepared by a facile solvothermal synthesis and then the nanohybrid chitosan (CS) PEMs were fabricated via solution casting. The hybrid PEMs with higher ion exchange capacity than the pure CS membrane displayed higher proton conductivity and selectivity. The proton conductivity of nanohybrid membrane doped with 7 wt% UiO‐66‐SCNT@GO (CS/U‐S@GO‐7) was enhanced to 64 mS cm−1 at 70°C. Simultaneously, the selectivity was reached 19.4 × 104 S s cm−3 and was much higher than the pristine CS membrane (0.13 × 103 S s cm−3). Moreover, the mechanical properties of all composite membranes were significantly enhanced compared with that of the pure CS membrane. The results showed that our research provided a valuable strategy for designing high‐performance CS‐based PEMs in direct methanol fuel cell (DMFC). Highlights A simple and facile solvothermal synthesis was used to prepare UiO‐66‐SCNT@GO. UiO‐66‐SCNT@GO was introduced into chitosan (CS) matrix to optimize proton transport channels. CS‐based hybrid membranes exhibit high proton conductivity and selectivity. CS‐based hybrid membranes show low methanol permeability.

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Zirconium Metal‐Organic Framework (UiO‐66) as a Robust Catalyst toward Solvent‐Free Synthesis of Remarkable Heterocyclic Rings

Cited by 34 publications

References 49 publications

Engineering UiO‐66 Metal Organic Framework for Heterogeneous Catalysis

Engineering UiO‐66 Metal Organic Framework for Heterogeneous Catalysis

Engineering Metal–Organic Framework Catalysts for C−C and C−X Coupling Reactions: Advances in Reticular Approaches from 2014–2018

Carbon nanocomposites self‐assembly UiO‐66‐doped chitosan proton exchange membrane with enhanced proton conductivity

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