Catalytic performance of surface-silylated and phenyl-bridged Ti-containing mesoporous silica for epoxidation of propylene

Zhang, Xiaoyu; Huang, Yongfa; Guo, Yiman; Xia, Yuan; Jiao, Feipeng

doi:10.1016/j.micromeso.2017.11.042

Cited by 19 publications

(2 citation statements)

References 37 publications

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“…The five-membered structure formed by the intermediate only occurs under reaction conditions when methanol solvents are added, oxygen atoms in the methanol will coordinate with the tetra-coordinated titanium atoms in the active intermediate of Ti-OOH, forming a five-membered ring intermediate . In this structure, the double bonds of alkene reactants are attacked by the oxygen atom at the β position of the five-membered ring, enabling efficient selective oxidation of alkenes to produce the corresponding epoxides. − This mechanism with the formation of five-membered ring provides a clear explanation for the solvent effect of methanol.…”

Section: Regulation Of Microenvironment Surrounding Ti Active Sitesmentioning

confidence: 98%

Constructing Highly Efficient Ti Sites of TS-1 for Alkene Epoxidation

Zhao,

Deng,

Lin

et al. 2023

Ind. Eng. Chem. Res.

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With the development of green engineering in manufacturing processes, emerging eco-sustainable technologies in chemical engineering systems has engendered a mounting interest. As one of the eco-sustainable green systems, alkene epoxidation with TS-1 and H2O2 is flourishing. In this review, a comprehensive summary for state-of-the-art synthetic strategies of high-efficient Ti sites in TS-1 for alkene epoxidation are summarized in three aspects (i.e., direct regulation of Ti active sites, physical structure adjustment of TS-1 particles, and regulation of microenvironment surrounding Ti active sites). These strategies could improve alkene epoxidation by modifying intrinsic active sites, improving molecules diffusion, adsorption, and desorption, and enhancing stability of reaction intermediates. Moreover, epoxidation mechanisms of different strategies and corresponding characterizations are elaborated and summarized systemically. Finally, we analyzed the current limitations and future perspectives on construction and characterization of high-efficiency Ti sites. This review could inspire more innovative research to boost the development of eco-sustainable alkene epoxidation.

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Section: Regulation Of Microenvironment Surrounding Ti Active Sitesmentioning

confidence: 98%

Constructing Highly Efficient Ti Sites of TS-1 for Alkene Epoxidation

Zhao,

Deng,

Lin

et al. 2023

Ind. Eng. Chem. Res.

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“…[50] Synthetically attractive feature of silicon-based protecting groups is that a suitable choice of substituents on the silicon atom can modulate their susceptibility to acid-and base-catalyzed hydrolysis, while a convenient way for their cleavage can be provided by the lability of the silyl ethers in the presence of fluoride ion. [51][52][53][54][55][56][57][58][59][60] Known as a group of chemical compounds, silyl ethers contain a silicon atom covalently bonded to an alkoxy group. R 1 R 2 R 3 Si-O-R 4 can be regarded as the general structure where R 4 is an alkyl group or an aryl group.…”

Section: Introductionmentioning

confidence: 99%

Recent advances in catalytic silylation of hydroxyl‐bearing compounds: A green technique for protection of alcohols using Si–O bond formations

Ashraf

Liu

et al. 2020

Applied Organom Chemis

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The development of catalytic silylation of alcohols under ambient reaction conditions plays an important role in organic synthesis. New silyl groups and methods for their introduction and removal are constantly being developed and offer chemists a wider range of options. In recent years, silyl protecting groups have been given expanded roles beyond their traditional use of temporarily rendering inactive alcohols. As silyl ether can be further converted to the parent alcohols in acidic conditions, silylation of alcohols can be regarded as an alternative method for hydroxyl protection under ambient reaction conditions. Merging the silyl protection/deprotection of alcohols with such modern methodologies, as green chemistry and nanoscience, has added additional value to these temporary components of synthetic intermediates. This review describes the historical background of the trimethylsilyl ethers preparation from alcohols using catalytic complexes and also the transformation of trimethylsilyl ethers into alcohol-containing compounds via deprecation techniques.

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Dipeptide‐functionalized MIL‐101(Fe) as efficient material for ibuprofen delivery

Asadi

Hamzavi

Shahverdizadeh

et al. 2018

Applied Organom Chemis

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Two derivatives of a dipeptide-functionalized metal-organic framework were synthesized through isocyanide-based multi-component reactions from amine-containing MIL-101(Fe). The functionalized materials were characterized by means of Fourier transform infrared spectroscopy, X-ray diffraction Brunauer-Emmett-Teller measurements, thermogravimetric analysis, elemental analysis and scanning electron microscopy. The performances of these functionalized MIL-101(Fe) materials with different functions were evaluated for ibuprofen delivery during six days, showing a good ability for adsorption of significant content of the drug and very slow release.

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Catalytic performance of surface-silylated and phenyl-bridged Ti-containing mesoporous silica for epoxidation of propylene

Cited by 19 publications

References 37 publications

Constructing Highly Efficient Ti Sites of TS-1 for Alkene Epoxidation

Constructing Highly Efficient Ti Sites of TS-1 for Alkene Epoxidation

Recent advances in catalytic silylation of hydroxyl‐bearing compounds: A green technique for protection of alcohols using Si–O bond formations

Dipeptide‐functionalized MIL‐101(Fe) as efficient material for ibuprofen delivery

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