112-61-8Relevant articles and documents
Dithranol, singlet oxygen and unsaturated fatty acids
Muller,Eibler,Mayer,et al.
, p. 2 - 9 (1986)
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Bagby,M.O. et al.
, p. 4227 - 4229 (1965)
Synthesis and characterization of composites based on polyaniline and styrene-divinylbenzene copolymer using benzoyl peroxide as oxidant agent
Moura,Assis,Franco,Antoniosi Filho,Rabelo
, p. 1255 - 1261 (2013)
This work presents a method to prepare composites based on polyaniline (Pani) and styrene-divinylbenzene copolymers (SD) by in situ polymerization of aniline using benzoyl peroxide as oxidant agent. The composites were obtained from copolymers with two degrees of porosities which have higher and lower surface areas. Emeraldine Pani was prepared using hydrochloric acid as dopant. One cycle or four cycles of aniline polymerization were performed. The copolymers and their respective composites characterizations were performed by infrared spectroscopy, thermogravimetric analysis, physical nitrogen adsorption-desorption measurements, morphology analysis, elemental analysis and determination of Br?nsted acid sites. The Pani was distributed overall porous SD copolymer producing composites with high surface area. Then, they were evaluated as catalysts for esterification reaction of a fat acid. It was found that that composites prepared with four cycles of in situ polymerization presented best catalytic activity than one cycle composites.
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Powell,R.G. et al.
, p. 528 - 533 (1966)
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Comparison of phosphatidylcholine vesicle properties related to geometrical isomerism
Ferreri, Carla,Pierotti, Silvia,Barbieri, Andrea,Zambonin, Laura,Landi, Laura,Rasi, Silvia,Luisi, Pier Luigi,Barigelletti, Francesco,Chatgilialoglu, Chryssostomos
, p. 274 - 280 (2006)
Glycerophosphatidylcholine containing trans-unsaturated fatty acid residues was prepared by reaction of the corresponding naturally occurring cis lipid with photochemically generated thiyl radicals. This modified lipid was chosen as the simplest model for gaining some insights of the complex scenario of membrane formation, in connection with the role of lipid geometry and the predominance of cis lipids in eukaryotic cells. The critical aggregation concentration for the spontaneous formation of vesicles was determined for cis and trans isomers with cis-parinaric acid used as a fluorescent probe and it was found to be similar for both lipids. Vesicle dimensions were investigated by light scattering and electron microscopy, and the type of fatty acid residues influenced the vesicle diameter, with a decrease along the series cis > trans > saturated. Fluorescence measurement of dye release from trans and cis vesicles showed also a different permeability. A picture emerged of the geometrical isomer preference in cells as a process driven by natural selection during the life evolution of different organisms, both in terms of compartment dimensions and membrane functionality.
Mesoporous RuO2/TiO2 composites prepared by cyclodextrin-assisted colloidal self-assembly: Towards efficient catalysts for the hydrogenation of methyl oleate
Bleta, Rudina,No?l, Sébastien,Addad, Ahmed,Ponchel, Anne,Monflier, Eric
, p. 14570 - 14579 (2016)
Mesoporous RuO2/TiO2 composites were prepared using a template-directed colloidal self-assembly approach combined with a cyclodextrin (CD)-assisted aqueous impregnation method. The supramolecular assemblies formed between the randomly methylated β-cyclodextrin (RaMeβ-CD) and the block copolymer P123 acted as a template for the formation of a highly porous TiO2 network over which uniform dispersion of ruthenium nanoparticles was achieved. By combining dynamic light scattering, X-ray diffraction, N2-adsorption, temperature-programmed reduction, field-emission scanning electron microscopy and high-resolution transmission electron microscopy, we show that CD-based assemblies provide a versatile and easily accessible toolbox with different functionalities for generating metal-supported catalysts with controlled pore architecture and uniform metal distribution. The performance of these supported catalysts was evaluated in the liquid phase hydrogenation of methyl oleate (MO, C18:1) to methyl stearate (MS, C18:0). Control of ruthenium dispersion into the large pores of RaMeβ-CD-P123-templated TiO2 material enhanced catalyst activity and selectivity for the hydrogenation of the internal C = C bond and permitted catalyst separation and reuse without loss of activity. Our findings highlight the pivotal role played by the CD-based assemblies on the performance of supported ruthenium catalysts.
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Tabacik,C.,Bard,M.
, p. 3093 - 3106 (1971)
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A direct novel synthesis of highly uniform dispersed ruthenium nanoparticles over P6mm ordered mesoporous carbon by host-guest complexes
Gokulakrishnan,Peru,Rio,Blach,Leger,Grosso,Monflier,Ponchel
, p. 6641 - 6648 (2014)
We report a novel concept to prepare a highly ordered mesoporous carbon with a uniform dispersion of ruthenium nanoparticles of 1-2 nm size range using a nano-templating method, based on the combined utilization of a β-cyclodextrin host-guest complex and ruthenium trichloride as respective sources of carbon and metal. The composite material synthesized (Ru@MCA-2) through the polymerization and carbonization of these metallo-supramolecular assemblies possesses high surface area and high pore volume after the removal of the silica template and exhibits high catalytic activity in the hydrogenation of unsaturated fatty acid methyl esters. The reusability of this nanoreplicated catalyst is also demonstrated. This journal is the Partner Organisations 2014.
Bioactive dammarane triterpenes from the mangrove Plant Bruguiera gymnorrhiza
Homhual, Sudarat,Bunyapraphatsara, Nuntavan,Kondratyuk, Tamara,Herunsalee, Angkana,Chaukul, Wongsatit,Pezzuto, John M.,Fong, Harry H. S.,Zhang, Hong-Jie
, p. 421 - 424 (2006)
Three new dammarane triterpenes, bruguierins A-C (1-3), were isolated from a petroleum ether extract of the flowers of Bruguiera gymnorrhiza. Their structures were determined on the basis of physical and spectroscopic data interpretation. With stably transfected HepG2 cells, the three isolates activated antioxidant response element (ARE luciferase activation) with EC50 values of 7.8, 9.4, and 15.7 μM, respectively. Bruguierin A (1) also inhibited phorbol ester-induced NFκB (nuclear factor-κB) luciferase activation with an IC50 value of 1.4 μM and selectively inhibited cyclooxygenase-2 (COX-2) activity with an IC50 value of 0.37 μM. Compounds 2 and 3 were not active in these bioassays.
Toxic acetylene-containing lipids from the red marine alga Liagora farinosa lamouroux
Paul,Fenical
, p. 3327 - 3330 (1980)
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Guarino et al.
, p. 147 (1968)
Effects of Si/Al ratio and Pt loading on Pt/SAPO-11 catalysts in hydroconversion of Jatropha oil
Chen, Ning,Gong, Shaofeng,Shirai, Hisakazu,Watanabe, Toshitaka,Qian, Eika W.
, p. 105 - 115 (2013)
A series of Pt/SAPO-11 catalysts were prepared with various Si/Al ratios and Pt loadings and characterized by using BET, XRD, XRF, and CO pulse adsorption, as well as 29Si NMR and NH3-TPD techniques. Their catalytic performances in hydroconversion of Jatropha oil were tested with a fixed-bed flow reactor system. The isomerization activity increased with the Si/Al ratio because there were more medium acidic sites on the SAPO-11 supports. Pt/SAPO-11 catalysts with a Si/Al ratio of 0.4 demonstrated high activity for both deoxygenation and isomerization among catalysts with the same Pt loading. The deoxygenation, isomerization and cracking activities strongly depended on the Pt loading. The best activity was observed for the sample with a 3 wt% Pt loading, which generated an 83% yield of iso-C15-18 hydrocarbons under the LHSV of 0.5 h-1. Based on the mechanistic study of hydroconversion of methyl oleate, a reaction network for the hydroconversion of Jatropha oil was suggested.
GERMACRANOLIDES, A GUAIANOLIDE WITH A β-LACTONE RING AND FURTHER CONSTITUENTS FROM GRAZIELIA SPECIES
Bohlmann, Ferdinand,Zdero, Christa,King, Robert M.,Robinson, Harold
, p. 1069 - 1076 (1981)
An investigation of three Grazielia species afforded, in addition to known compounds, several new sesquiterpene lactones, eight germacranolides, two melampolides and one guaianolide as well as three diterpenes, two geranylgeraniol derivatives and a labda-diene.Three of the sesquiterpene lactones had an additional β-lactone ring, one an acid function, and two others unusual ester functions.The structures were elucidated by spectroscopic methods and some chemical transformations.The chemotaxonomic situation is discussed briefly.Key Word Index- Grazielia intermedia; G. dimorpholepsis; G. serreta; Compositae; Eupatorieae; sesquiterpene lactones; germacranolides; guaianolides; melampolides; β-lactones; diterpenes.
Iron complex with ionic tag-catalyzed olefin reduction under oxidative conditionsa-A different reaction for iron
Dos Santos, Marcelo R.,Gomes, Alexandre F.,Gozzo, Fabio C.,Suarez, Paulo A. Z.,Neto, Brenno A. D.
, p. 2383 - 2389 (2012)
An iron(III) complex with ionic tags was applied to the reduction of alkenes in imidazolium-based ionic liquids (ILs) under oxidative conditions. The catalyst is very efficient to promote reactions of biomass derivatives. At least ten recycling reactions were performed without any loss of catalytic activity. Some important mechanistic insights for this new reaction are also provided based mostly on electrospray ionization quadrupole-time of flight mass spectrometry (ESI-QTOF-MS).
A NEW HYDROXYOLEFINIC ACID FROM PLANTAGO MAJOR SEED OIL
Ahmad, Mohammad Shamim,Ahmad, Moghis U.,Osman, S. M.
, p. 2137 - 2140 (1980)
Key Word Index - Plantago major; Plantaginaceae; greater plantain; seed oil; 9-hydroxy-cis-11-octadecenoic acid.A new isomer of ricinoleic acid has been found as a minor constituent (1.5percent) of the seed oil of Plantago major.This previously unknown β-hydroxyolefinic acid, 9-hydroxy-cis-11-octadecenoic, was characterized by IR, 1H NMR and oxidative cleavage, and the structure was supported by MS.
Protic ionic liquids from di- or triamines: even cheaper Br?nsted acidic catalysts
Barteczko, Natalia,Brz?czek-Szafran, Alina,Byrne, Emily,Chrobok, Anna,Kolanowska, Anna,Swad?ba Kwa?ny, Ma?gorzata,Szelwicka, Anna,Wi?c?awik, Justyna
, p. 4421 - 4429 (2021/06/28)
Dicationic and tricationic ionic liquids, synthesised by proton transfer from sulfuric acid and corresponding di- and triamines, were characterised and used as Br?nsted acidic catalysts in biodiesel production. It has been demonstrated that the new ionic liquids are less expensive than those based on monoamines (even on triethylamine) and are highly acidic. Their performance in a model catalytic esterification reaction surpassed that of sulfuric acid and other literature reports, due to the capability of the ionic liquids to absorb water while phase-separating the ester, thereby shifting the reaction equilibrium towards products. The overall catalytic performance was an interplay between acidity (quantified by Gutmann AN) and physical properties: density and viscosity, which enabled easy phase separation, thereby separating water from the ester. The substrate scope and recycling studies have demonstrated that the new ionic liquids are robust and recyclable catalysts.
Anionic Amphiphilic Cyclodextrins Bearing Oleic Grafts for the Stabilization of Ruthenium Nanoparticles Efficient in Aqueous Catalytic Hydrogenation
Cocq, Aurélien,Léger, Bastien,No?l, Sébastien,Bricout, Hervé,Djeda?ni-Pilard, Florence,Tilloy, Sébastien,Monflier, Eric
, p. 1013 - 1018 (2019/12/27)
Oleic succinyl β-cyclodextrin was proved to be efficient for the stabilization of ruthenium nanoparticles (NPs) in aqueous medium. These NPs were characterized by FTIR spectroscopy and transition electron microscopy (TEM). The catalytic activity of these NPs was evaluated in the aqueous hydrogenation of petrosourced and biosourced unsaturated compounds such as benzene and furfural derivatives. The catalytic system can be easily recycled and reused up to nine runs without any loss of activity and selectivity, demonstrating its robustness.
