A new silica based substituted piperidine derivative catalyzed expeditious room temperature synthesis of homo and hetero bis-Knoevenagel condensation products
TL;DR: In this paper, a new silica based piperidine derivative has been designed, synthesized and characterized by solid state carbon 13 CP MAS NMR, BET surface area analysis, IR, TGA studies, elemental analysis and pH experiment.
About: This article is published in Catalysis Communications.The article was published on 2011-09-15. It has received 26 citations till now. The article focuses on the topics: Knoevenagel condensation.
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TL;DR: In this article, a simple and practical synthetic strategy for the synthesis of a novel silica-supported organocatalyst system based on L -proline (SSLP) has been developed.
Abstract: A simple and practical synthetic strategy for the synthesis of a novel silica-supported organocatalyst system based on L -proline (SSLP) has been developed. First, silica was treated with trimethoxy(vinyl)silane to produced a vinyl-silica (VS) substrate. Then, VS was oxidized using H 2 O 2 to generate the silica-oxiran (SO) material. Finally, ring-opening of oxiranes in SO substrate with L -proline was resulted the production of SSLP catalyst. The catalytic performance of SSLP was evaluated in the three-component synthesis of spirooxindole derivatives via the condensation reaction of isatins and dicarbonyl compounds in water. All reactions were completed in short times and all products were obtained in good to excellent yields. Besides, SSLP could be recovered for 8 times without any additional treatments.
61 citations
TL;DR: The approach to naphthyridines presented herein offers for the first time an unprecedented coupling which leads to the construction of both the nitrogen containing rings during the synthesis without starting from any nitrogen-containing heterocycle moiety.
55 citations
TL;DR: An environmentally friendly palladium-based catalyst supported on proline-functionalized chitosan was successfully prepared and evaluated as a heterogeneous nanocatalyst in the Suzuki cross-coupling reaction of various aryl halides with phenylboronic acid as mentioned in this paper.
Abstract: An environmentally friendly palladium-based catalyst supported on proline-functionalized chitosan was successfully prepared and evaluated as a heterogeneous nanocatalyst in the Suzuki cross-coupling reaction of various aryl halides with phenylboronic acid. The catalyst was characterized by FT-IR, FE-SEM, TEM, XRD, SEM-EDX, ICP and TGA techniques and exhibited reasonable catalytic activity in the reaction system, producing substituted biaryls in good to excellent yields. In addition, the catalyst could be recovered in a facile manner from the reaction mixture and recycled several times.
41 citations
TL;DR: In this paper, a stable, environmentally benign ZnTiO3 nanopowder has been prepared via a sustainable sol-gel method using two different catalytic functions, i.e., an acidic one which is given by Ti(IV) ions and a basic one, given by the oxide ion incorporated within the metal oxide framework.
41 citations
34 citations
References
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TL;DR: Solid catalysts provide numerous opportunities for recovering and recycling catalysts from reaction environments, which can lead to improved processing steps, better process economics, and environmentally friendly industrial manufacturing.
Abstract: Solid catalysts provide numerous opportunities for
recovering and recycling catalysts from reaction
environments. These features can lead to improved
processing steps, better process economics, and environmentally
friendly industrial manufacturing.
Thus, the motivating factors for creating recoverable
catalysts are large.
1,164 citations
TL;DR: A review with ca. 400 references dealing with the use of mesoporous silica and organically modified silica-based materials for removal of inorganic and organic pollutants from aqueous solutions is provided in this article.
Abstract: A review with ca. 400 references is provided dealing with the use of mesoporous silica and organically-modified silica-based materials for removal of inorganic and organic pollutants from aqueous solutions. After having briefly discussed the interest of functionalized mesoporous silica for environmental remediation purposes, the various synthetic methods to prepare such nanoengineered adsorbents are described. Then, their application to the removal of heavy metal species, toxic anions, radionuclides, and a wide range of organic pollutants is presented in a comprehensive way with the help of extensive tables and some illustrating figures.
526 citations
TL;DR: In this article, the authors synthesized a micropyl-functionalized porous silicates by co-condensation of (mercaptopropyl)triethoxysilane and tetramethoxyclic acid in the presence of a cationic surfactant.
Abstract: Mercaptopropyl-functionalized porous silicates were synthesized by the co-condensation of (mercaptopropyl)triethoxysilane and tetramethoxysilane in the presence of a cationic surfactant. The ordered hexagonal arrays of channels in the extracted product were microporous (14 A pore diameter) and contained high concentrations of alkylthiol functions. It was possible to oxidize the supported thiol groups to sulfonic acid groups, thus creating a solid acid ion exchanger. The sulfonic-acid functionalized material is an efficient heterogeneous acid catalyst.
457 citations
TL;DR: Mesoporous silicas were functionalised with sulfonic acid groups, and the resulting materials are excellent catalysts for formation of bisfurylalkanes and polyol esters as discussed by the authors.
442 citations
TL;DR: Very stable organically modified MCMs are prepared by a simple one-step procedure from readily available starting materials as mentioned in this paper, which can be used to build a stable MCM from a simple starting material.
384 citations