scholarly journals Cu-Kojic Acid Complex Anchored to Functionalized Silica-MCM-41: A Promising Regioselective and Reusable Nanocatalyst for Click Reaction

ACS Omega ◽  
2020 ◽  
Vol 5 (35) ◽  
pp. 22099-22108
Author(s):  
Khadijeh Ojaghi Aghbash ◽  
Nader Noroozi Pesyan ◽  
Hana Batmani
Keyword(s):  
Kojic Acid ◽  
Click Reaction ◽  
Functionalized Silica ◽  
Acid Complex ◽  
Mcm 41

A click strategy for the immobilization of palladium nanoparticles onto silica: efficient and recyclable catalysts for carbon–carbon bond formation under mild reaction conditions

RSC Advances ◽  
2016 ◽  
Vol 6 (81) ◽  
pp. 78080-78089 ◽  
Author(s):  
Abdol R. Hajipour ◽  
Parisa Abolfathi ◽  
Fatemeh Mohammadsaleh
Keyword(s):  
Palladium Catalyst ◽  
Palladium Nanoparticles ◽  
Click Reaction ◽  
Bond Formation ◽  
Coupling Reactions ◽  
Functionalized Silica ◽  
Reaction Conditions ◽  
Carbon Bond ◽  
Carbon Carbon Bond ◽  
Recyclable Catalysts

The synthesis of silica-grafted palladium catalyst through “click” reaction of azide-functionalized silica with methylpropargylimidazolium bromide, for Heck and Suzuki–Miyaura coupling reactions.

Covalent binding of a Fischer-type metal carbene in ordered mesoporous MCM-41-functionalized silica

2008 ◽  
Vol 281 (1-2) ◽  
pp. 137-145 ◽  
Author(s):  
María Luisa Ojeda ◽  
Antonio Campero ◽  
José Guadalupe López-Cortés ◽  
María Carmen Ortega-Alfaro ◽  
Celso Velásquez ◽  
...  
Keyword(s):  
Covalent Binding ◽  
Functionalized Silica ◽  
Ordered Mesoporous ◽  
Mcm 41

scholarly journals A straightforward, environmentally beneficial synthesis of spiro[diindeno[1,2-b:2′,1′-e]pyridine-11,3′-indoline]-2′,10,12-triones mediated by a nano-ordered reusable catalyst

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mahsa Fathi ◽  
M. Reza Naimi-Jamal ◽  
Mohammad G. Dekamin ◽  
Leila Panahi ◽  
Oleg M. Demchuk
Keyword(s):  
Reaction Times ◽  
Environmental Benefits ◽  
Reusable Catalyst ◽  
Functionalized Silica ◽  
Chromatographic Purification ◽  
One Pot ◽  
Metal Free ◽  
Ph Indicators ◽  
Ordered Mesoporous ◽  
Mcm 41

AbstractA library of new spiro[diindeno[1,2-b:2′,1′-e]pyridine-11,3′-indoline]-2′,10,12-trione derivatives has been prepared in an efficient, one-pot pseudo four-component method mediated by a reusable heterogeneous nano-ordered mesoporous SO3H functionalized-silica (MCM-41-SO3H) catalyst. Excellent yields, short reaction times, as well as convenient non-chromatographic purification of the products and environmental benefits such as green and metal-free conditions constitute the main advantages of the developed synthetic methodology. The obtained fused indole-indenone dyes would be of interest to pharmaceutical and medicinal chemistry. Furthermore, due to their sensitivity to pH changes, they could be used as novel pH indicators.

scholarly journals Thermal and Flame Retardant Properties of Phosphate-Functionalized Silica/Epoxy Nanocomposites

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5418
Author(s):  
Il Jin Kim ◽  
Jae Wang Ko ◽  
Min Seop Song ◽  
Ji Won Cheon ◽  
Dong Jin Lee ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Flame Retardant ◽  
Click Reaction ◽  
Hybrid Nanoparticles ◽  
Functionalized Silica ◽  
Effective Strategy ◽  
Epoxy Nanocomposites ◽  
Multifunctional Additive ◽  
Epoxy Nanocomposite ◽  
Flame Retardant Properties

We report a flame retardant epoxy nanocomposite reinforced with 9,10-dihydro-9-oxa-10-phosphaphenantrene-10-oxide (DOPO)-tethered SiO2 (DOPO-t-SiO2) hybrid nanoparticles (NPs). The DOPO-t-SiO2 NPs were successfully synthesized through surface treatment of SiO2 NPs with (3-glycidyloxypropyl)trimethoxysilane (GPTMS), followed by a click reaction between GPTMS on SiO2 and DOPO. The epoxy nanocomposites with DOPO-t-SiO2 NPs as multifunctional additive exhibited not only high flexural strength and fracture toughness but also excellent flame retardant properties and thermal stability, compared to those of pristine epoxy and epoxy nanocomposites with a single additive of SiO2 or DOPO, respectively. Our approach allows a facile, yet effective strategy to synthesize a functional hybrid additive for developing flame retardant nanocomposites.

Tailoring of organically-modified silica MCM-41 type materials with dye molecules

2000 ◽  
Vol 628 ◽  
Author(s):  
Bénédicte Lebeau ◽  
Christabel E. Fowler ◽  
Stephen Mann
Keyword(s):  
Ethylene Oxide ◽  
Self Assembly ◽  
Pore Channel ◽  
Functionalized Silica ◽  
Modified Silica ◽  
Swelling Agent ◽  
Silica Materials ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Mcm 41

ABSTRACTMicelle templated co-condensation of tetraethoxysilane and 3-(2,4-dinitrophenylamino)-propyltriethoxysilane was used to covalently attach an organic chromophore into silica materials with MCM-41 architecture. Hexagonally highly-ordered mesoporous dye-functionalized silica materials with various dye contents (up to 43 wt%) were precipitated from alkaline and acidic aqueous solutions containing cetyltrimethylammonium bromide (C16TMAB) surfactant. These materials were obtained in the form of powders, excluding their use in thin film applications, such as required for membrane and optical devices. Therefore, an evaporation-induced self assembly process was used to prepare transparent mesostructured dye-functionalized silica thin films and monoliths. Analogous materials with increased pore channel sizes were fabricated by addition of the micelle swelling agent 1,3,5-trimethylbenzene to the reaction mixture or by replacing C16TMAB surfactant by an amphiphilic triblock copolymer (poly (ethylene oxide)-block-poly (propylene oxide)-block-poly (ethylene oxide)). This synthetic route was also used to produce bimodal mesostructured dye-modified silica materials using both latex spheres and C16TMAB micelles as organic structure-directing agents.

The role of copper(I)-nicotinic acid complex on kojic acid biosynthesis byAspergillus flavus

1987 ◽  
Vol 27 (1) ◽  
pp. 29-33 ◽  
Author(s):  
S. E. Megalla ◽  
A. Y. Nassar ◽  
M. A. S. Gohar
Keyword(s):  
Nicotinic Acid ◽  
Kojic Acid ◽  
Acid Biosynthesis ◽  
Acid Complex
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