Efficient acetalization of benzaldehydes using UiO-66 and UiO-67: Substrates accessibility or Lewis acidity of zirconium

Arrozi, Ubed Sonai Fahruddin; Wijaya, Husni Wahyu; Patah, Aep; Permana, Yessi

doi:10.1016/j.apcata.2015.08.028

Cited by 69 publications

(54 citation statements)

References 52 publications

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“…All reagents and beginning compounds were provided by Fluka and Merck and were utilized without extra purification. All of the synthesized products were well known and characterized by comparison of their chemical and physical data to the literature . Melting points were obtained on a Bumstead electrothermal 9200 apparatus.…”

Section: Methodsmentioning

confidence: 99%

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Ethylene diamine grafted nanoporous UiO‐66 as an efficient basic catalyst in the multi‐component synthesis of 2‐aminithiophenes

Erfaninia

Tayebee

Dušek

et al. 2018

Applied Organom Chemis

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This study demonstrates ED-UiO-66 as a novel and effective solid nanoporous basic catalyst prepared through the amine grafting onto the pores of UiO-66. The manufactured nanoparticles were identified by FT-IR, XRD, TGA, FESEM, TEM, CHN and BET and the characterization results certified formation of a single phase nanoporous substance with the medium grain size less than 90 nm. The synthesized material was employed as an efficient catalyst for the preparation of 2-aminotiophenes through the Gewald method. This thermochemically stable nanocatalyst was environmentally safe, reusable and economic. Therefore, this methodology can be simply extended for industrial goals.

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Section: Methodsmentioning

confidence: 99%

“…The solid product was dispersed in chloroform at room temperature, and the solvent was withdrawn. The white powder crystals were dried under vacuum at 140 °C for 8 h …”

Section: Methodsmentioning

confidence: 99%

Ethylene diamine grafted nanoporous UiO‐66 as an efficient basic catalyst in the multi‐component synthesis of 2‐aminithiophenes

Erfaninia

Tayebee

Dušek

et al. 2018

Applied Organom Chemis

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“…Furthermore, when acetic acid was present in the synthesis of the material, the conversion of benzaldehyde dramatically enhanced to 98 % in shorter time under identical conditions. [30] Based on theoretical calculations and modelling, it was proposed that accessibility of substrates to internal active sites can play a dominant role over the Lewis acidity of Zr-MOF for large substrates. It is worth noting that acetic acid in the absence of UiO-66 shows only 10 % of benzaldehyde conversion.…”

Section: Nodes As Lewis Acidsmentioning

confidence: 99%

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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“…41,42 Thus, this inorganic secondary building unit (SBU) has been employed as a platform to build thermally and chemically stable MOFs that are critical for practical applications. 43,44 Recently, MOFs combining zirconium clusters and porphyrinbased linkers have been synthesized and showed interesting physical and chemical properties that allowed them to be used in catalysis, light-harvesting and oxygen transportation. 45 In this work, we argued that metal-organic frameworks are an ideal platform to assemble porphyrins into higher ordered structures that will ensure (1) disaggregation of porphyrins and (2) rigidification of their structures.…”

Section: Introductionmentioning

confidence: 99%