Hydrothermal synthesis of Sn-Beta zeolites in F−-free medium

2018 ◽  
Vol 5 (11) ◽  
pp. 2763-2771 ◽  
Author(s):  
Hao Xu ◽  
Xudong Wang ◽  
Peng Ji ◽  
Haihong Wu ◽  
Yejun Guan ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Lewis Acid ◽  
Crystal Size ◽  
Acid Catalysts ◽  
Free Medium ◽  
Lewis Acid Catalysts ◽  
Structure Directing Agent ◽  
Highly Active ◽  
Beta Zeolites

Sn-Beta zeolites, with high Sn content and smaller crystal size, hydrothermally synthesized in F−-free medium using N-cyclohexyl-N,N-dimethylcyclohexanaminium hydroxide as the structure-directing agent with the assistance of Na+ and seed, are highly active as Lewis acid catalysts.

Hydrothermal synthesis of boron-free Zr-MWW and Sn-MWW zeolites as robust Lewis acid catalysts

2020 ◽  
Vol 56 (34) ◽  
pp. 4696-4699
Author(s):  
Zhiguo Zhu ◽  
Yejun Guan ◽  
Haikuo Ma ◽  
Hao Xu ◽  
Jin-gang Jiang ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Lewis Acid ◽  
Acid Catalysts ◽  
Oxidation Reactions ◽  
Lewis Acid Catalysts ◽  
Structure Directing Agent ◽  
Catalytic Behavior ◽  
Dual Structure ◽  
Villiger Oxidation

Boron-free Zr-MWW and Sn-MWW metallosilicates were synthesized via dual structure-directing agent-facilitated crystallization, which demonstrated unique catalytic behavior in Meerwein–Pondorf–Verley and Baeyer–Villiger oxidation reactions.

Structural reconstruction: a milestone in the hydrothermal synthesis of highly active Sn-Beta zeolites

2017 ◽  
Vol 53 (93) ◽  
pp. 12516-12519 ◽  
Author(s):  
Zhiguo Zhu ◽  
Hao Xu ◽  
Jingang Jiang ◽  
Haihong Wu ◽  
Peng Wu
Keyword(s):  
Hydrothermal Synthesis ◽  
Lewis Acid ◽  
State Of The Art ◽  
Highly Active ◽  
Beta Zeolites ◽  
Acid Catalyzed ◽  
Catalyzed Reactions ◽  
Catalytic Performances

Hydrophobic Sn-Beta zeolites, hydrothermally synthesized via structural reconstruction, exhibit unparalleled catalytic performances for Lewis acid-catalyzed reactions, far outperforming post-synthesized Sn-Beta and state-of-the-art Sn-Beta-F materials.

Lead-containing Beta zeolites as versatile Lewis acid catalysts for the aminolysis of epoxides

2018 ◽  
Vol 264 ◽  
pp. 230-239 ◽  
Author(s):  
Yuchao Chai ◽  
Linjun Xie ◽  
Zhiyang Yu ◽  
Weili Dai ◽  
Guangjun Wu ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Acid Catalysts ◽  
Lewis Acid Catalysts ◽  
Beta Zeolites

Diaryliodonium salts as efficient Lewis acid catalysts for direct three component Mannich reactions

RSC Advances ◽  
2015 ◽  
Vol 5 (32) ◽  
pp. 25485-25488 ◽  
Author(s):  
Yanxia Zhang ◽  
Jianwei Han ◽  
Zhen-Jiang Liu
Keyword(s):  
Lewis Acid ◽  
Mannich Reaction ◽  
Solvent Free ◽  
Acid Catalysts ◽  
Lewis Acid Catalysts ◽  
Mannich Reactions ◽  
Highly Active ◽  
Diaryliodonium Salts ◽  
Solvent Free Conditions

Diaryliodonium(iii) salts, as highly active and versatile Lewis acid catalysts for the direct three component Mannich reaction under solvent free conditions, have been investigated.

Improved Postsynthesis Strategy to Sn-Beta Zeolites as Lewis Acid Catalysts for the Ring-Opening Hydration of Epoxides

ACS Catalysis ◽  
2014 ◽  
Vol 4 (8) ◽  
pp. 2801-2810 ◽  
Author(s):  
Bo Tang ◽  
Weili Dai ◽  
Guangjun Wu ◽  
Naijia Guan ◽  
Landong Li ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Ring Opening ◽  
Acid Catalysts ◽  
Lewis Acid Catalysts ◽  
Beta Zeolites

scholarly journals Tin-containing silicates: structure–activity relations

2012 ◽  
Vol 468 (2143) ◽  
pp. 2000-2016 ◽  
Author(s):  
Christian M. Osmundsen ◽  
Martin Spangsberg Holm ◽  
Søren Dahl ◽  
Esben Taarning
Keyword(s):  
Lewis Acid ◽  
Active Site ◽  
Low Temperatures ◽  
Acid Strength ◽  
Acid Catalysts ◽  
Lewis Acid Catalysts ◽  
Highly Active ◽  
Structure Activity ◽  
Structure Activity Relations ◽  
Mcm 41

The selective conversion of biomass-derived substrates is one of the major challenges facing the chemical industry. Recently, stannosilicates have been employed as highly active and selective Lewis acid catalysts for a number of industrially relevant reactions. In the present work, four different stannosilicates have been investigated: Sn-BEA, Sn-MFI, Sn-MCM-41 and Sn-SBA-15. When comparing the properties of tin sites in the structures, substantial differences are observed. Sn-beta displays the highest Lewis acid strength, as measured by probe molecule studies using infrared spectroscopy, which gives it a significantly higher activity at low temperatures than the other structures investigated. Furthermore, the increased acid strength translates into large differences in selectivity between the catalysts, thus demonstrating the influence of the structure on the active site, and pointing the way forward for tailoring the active site to the desired reaction.

Urea-Catalyzed Functionalization of Unactivated C–H Bonds

2020 ◽  
Author(s):  
Alex L. Bagdasarian ◽  
Stasik Popov ◽  
Benjamin Wigman ◽  
Wenjing Wei ◽  
woojin lee ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Organic Synthesis ◽  
High Energy ◽  
Acid Catalysts ◽  
Potential Utility ◽  
New Paradigm ◽  
Lewis Acid Catalysts ◽  
Reaction Conditions ◽  
Highly Active ◽  
Acidic Nature

Herein we report the 3,5bistrifluoromethylphenyl urea-catalyzed functionalization of unactivated C–H bonds. In this system, the urea catalyst mediates the formation of high-energy vinyl carbocations that undergo facile C–H insertion and Friedel–Crafts reactions. We introduce a new paradigm for these privileged scaffolds where the combination of hydrogen bonding motifs and strong bases affords highly active Lewis acid catalysts capable of ionizing strong C–O bonds. Despite the highly Lewis acidic nature of these catalysts that enables triflate abstraction from sp<sup>2</sup> carbons, these newly found reaction conditions allow for the formation of heterocycles and tolerate highly Lewis basic heteroaromatic substrates. This strategy showcases the potential utility of dicoordinated vinyl carbocations in organic synthesis.<br>

Urea-Catalyzed Functionalization of Unactivated C–H Bonds

2020 ◽  
Author(s):  
Alex L. Bagdasarian ◽  
Stasik Popov ◽  
Benjamin Wigman ◽  
Wenjing Wei ◽  
woojin lee ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Organic Synthesis ◽  
High Energy ◽  
Acid Catalysts ◽  
Potential Utility ◽  
New Paradigm ◽  
Lewis Acid Catalysts ◽  
Reaction Conditions ◽  
Highly Active ◽  
Acidic Nature

Herein we report the 3,5bistrifluoromethylphenyl urea-catalyzed functionalization of unactivated C–H bonds. In this system, the urea catalyst mediates the formation of high-energy vinyl carbocations that undergo facile C–H insertion and Friedel–Crafts reactions. We introduce a new paradigm for these privileged scaffolds where the combination of hydrogen bonding motifs and strong bases affords highly active Lewis acid catalysts capable of ionizing strong C–O bonds. Despite the highly Lewis acidic nature of these catalysts that enables triflate abstraction from sp<sup>2</sup> carbons, these newly found reaction conditions allow for the formation of heterocycles and tolerate highly Lewis basic heteroaromatic substrates. This strategy showcases the potential utility of dicoordinated vinyl carbocations in organic synthesis.<br>

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