110-42-9Relevant articles and documents
Development of mesoscopically assembled sulfated zirconia nanoparticles as promising heterogeneous and recyclable biodiesel catalysts
Das, Swapan K.,El-Safty, Sherif A.
, p. 3050 - 3059 (2013)
The nanoassembly of nearly monodisperse nanoparticles (NPs) as uniform building blocks to engineer zirconia (ZrO2) nanostructures with mesoscopic ordering by using a template as a fastening agent was explored. The mesophase of the materials was investigated through powder X-ray diffraction and TEM analysis (TEM) and N2 sorption studies. The TEM results revealed that the mesopores were created by the arrangement of ZrO2 NPs with sizes of 7.0-9.0nm and with broad interparticle pores. Moreover, the N2 sorption study confirmed the results. The surface chemical analysis was performed to estimate the distribution of Zr, O, and S in the sulfated ZrO2 matrices. The materials in this study displayed excellent catalytic activity in the biodiesel reaction for effective conversion of long-chain fatty acids to their methyl esters, and the maximum biodiesel yield was approximately 100%. The excellent heterogeneous catalytic activity could be attributed to the open framework, large surface area, presence of ample acidic sites located at the surface of the matrix, and high structural stability of the materials. The catalysts revealed a negligible loss of activity in the catalytic recycles.
Kinetic and molecular orbital analyses of dicarboxylic acylcarnitine methylesterification show that derivatization may affect the screening of newborns by tandem mass spectrometry
Maeda, Yasuhiro,Nakajima, Yoko,Gotoh, Kana,Hotta, Yuji,Kataoka, Tomoya,Sugiyama, Naruji,Shirai, Naohiro,Ito, Tetsuya,Kimura, Kazunori
, p. 121 - 125 (2016)
Newborns are routinely screened for organic acidemias by acylcarnitine analysis. We previously reported the partial catalytic methylesterification of dicarboxylic acylcarnitines by benzenesulfonic acid moiety in the solid extraction cartridge during extraction from serum. Since the diagnosis of organic acidemias by tandem mass spectrometry is affected by the higher molecular weight of these derivatized acylcarnitines, we investigated the methylesterification conditions. The kinetic constants for the methylesterification of carboxyl groups on the acyl and carnitine sides of carnitine were 2.5 and 0.24 h-1, respectively. The physical basis underlying this difference in methylesterification rates was clarified theoretically, illustrating that methylesterification during extraction proceeds easily and must be prevented.
Stoloniferins VIII-XII, resin glycosides, from Ipomoea stolonifera
Noda, Naoki,Takahashi, Naotsugu,Miyahara, Kazumoto,Yang, Chong-Ren
, p. 837 - 841 (1998)
Five new ether-soluble resin glycosides were isolated from whole plants of Ipomoea stolonifera. Their structures have been determined on the basis of chemical and spectral data. Similar to the resin glycosides previously isolated, all of them are monomers of a jalapinolic acid tetra- or penta- glycoside in which the sugar moiety is partially acylated by organic acids and also combined with the carboxy group of the aglycone to form a macrocyclic ester structure.
Defense Mechanisms of Arthropods. 83. α- and β-Necrodol, Novel Terpenes from a Carrion Beetle (Necrodes surinamensis, Silphidae, Coleoptera)
Roach, Braden,Eisner, Thomas,Meinwald, Jerrold
, p. 4047 - 4051 (1990)
The defensive secretion obtained from the rectal gland of the carrion beetle Necrodes surinamensis has been found to consist of a mixture of aliphatic acids and terpene alcohols.Octanoic acid, decanoic acid, (Z)-3-decenoic acid, (Z)-4-decenoic acid, hexadecanoic acid, and octadecanoic acid are the chief acidic components.The three major terpenes are lavandulol and α- and β-necrodol.The necrodols were shown to have a 1,2,2,3,4-pentamethylcyclopentane framework not previously found among natural monoterpenes.Formulas 9 and 10 are derived for α- and β-necrodol, respectively, chiefly on the basis of mass spectrometric and NMR spectroscopic analysis.
Lupeol-3-O-decanoate, a new triterpene ester from Cadaba farinosa Forssk. growing in Saudi Arabia
Al-Musayeib, Nawal M.,Mohamed, Gamal A.,Ibrahim, Sabrin R. M.,Ross, Samir A.
, p. 5297 - 5302 (2013)
A new triterpene ester (1) together with eight known compounds (2-9) were isolated from the leaves of Cadaba farinosa Forssk. Their chemical structures were established on the basis of physical, chemical, and spectroscopic methods (IR, 1D and 2D NMR, and mass spectral analyses) to be: lupeol-3-O-decanoate (1), lupeol (2), β-sitosterol (3), ursolic acid (4), 12-aminododecanoic (5), dillenetin-3-O-β-d-glucopyranoside (6), stachydrine (7), 3-hydroxy-stachydrine (8), and quercetin-3-O-β-d-glucopyranoside (9). That is the first report for the isolation of compound 5 from a plant source. Compounds 5, 6, and 9 were evaluated for their antioxidant activity.
AN 8-HYDROXYOCTADECA-CIS-11,14-DIENOIC ACID FROM MIRABILIS JALAPA SEED OIL
Ahmad, Mohammad Shamim,Rauf, Abdul,Mustafa, Jamal,Osman, Sheikh Mohammad
, p. 2247 - 2250 (1984)
A fatty acid, found as a minor component in the seed oil of Mirabilis jalapa, is shown to be the hitherto unknown 8-hydroxyoctadeca-cis-11,14-dienoic acid. - Key Word Index: Mirabilis jalapa; Nyctaginaceae; seed oil; 8-hydroxyoctadeca-cis-11,14-dienoic acid.
Bile acid hydrazides: Gelation, structural, physical and spectroscopic properties
Pore, Vandana S.,Agalave, Sandip G.,Pharande, Shrikant G.,Patil, Prashant A.,Kotmale, Amol S.
, p. 453 - 460 (2015)
Synthesis and gelation properties of a series of novel bile acid hydrazides are presented. These compounds are found to undergo self-assembly leading to organogelation in certain organic solvents. Compound 1 was found to be the most "effective" gelator in this series. The properties of this gel have been thoroughly investigated by conventional methods typical for molecular gel studies. Sol-gel transition temperature (Tg) of chloroform gels of compounds 1 and 3 was found to increase with increase in the chain length. Sol-gel transition was probed using the isothermal time test and results show that there is instantaneous increase in both the moduli after shear melting, which suggests that the kinetics of formation of the network was very fast. IR and NMR studies revealed hydrogen bonding between amidic carbonyl in the side chain and hydroxyl groups of cholic acid.
NEW BUTENOLIDES FROM THE GORGONIAN EUPLEXAURA FLAVA(NUTTING)
Kikuchi, Hiroyuki,Tsukitani, Yasumasa,Nakanishi, Hajime,Shimizu, Iwao
, p. 233 - 236 (1982)
Four new butanolides (1a-d) were isolated from the Japanese gorgonian Euplexaura flava(Nutting).The structures of these compounds were elucidated from spectral data and chemical reactions.
Lipophilic gold(I) complexes with 1,3,4-oxadiazol-2-thione or 1,3-thiazolidine-2-thione moieties: synthesis and their cytotoxic and antimicrobial activities
de Almeida, Angelina Maria,de Oliveira, Bruno Assis,de Castro, Pedro P?ssa,de Mendon?a, Camille Carvalho,Furtado, Ricardo Andrade,Nicolella, Heloiza Diniz,da Silva, Vania Lúcia,Diniz, Cláudio Galuppo,Tavares, Denise Crispim,Silva, Heveline,de Almeida, Mauro Vieira
, p. 841 - 857 (2017)
Novel lipophilic gold(I) complexes containing 1,3,4-oxadiazol-2-thione or 1,3-thiazolidine-2-thione derivatives were synthesized and characterized by IR, high resolution mass spectrometry, and 1H, 13C 31P NMR. The cytotoxicity of the compounds was evaluated considering cisplatin and/or auranofin as reference in different tumor cell lines: colon cancer (CT26WT), metastatic skin melanoma (B16F10), breast adenocarcinoma (MCF-7), cervical carcinoma (HeLa), glioblastoma (M059?J). Normal human lung fibroblasts (GM07492-A) and kidney normal cell (BHK-21) were also evaluated. The gold(I) complexes were more active than their respective free ligands and cisplatin. Furthermore, antibacterial activity was evaluated against Gram-positive bacteria Staphylococcus aureus ATCC 25213, Staphylococcus epidermidis ATCC 12228 and Gram-negative bacteria Escherichia coli ATCC 11229 and Pseudomonas aeruginosa ATCC 27853 and expressed as the minimum inhibitory concentration (MIC). The complexes exhibited lower MIC values when compared to the ligands and chloramphenicol against Gram-positive bacteria and Gram-negative bacteria. Escherichia coli was sensitive one to the action of gold(I) complexes.
Carbon-carbon bond fission on oxidation of primary alcohols to carboxylic acids
Bekish, Andrei V.
, p. 3082 - 3085 (2012)
α-Carbon-carbon bond cleavage is shown to be a general side reaction accompanying the oxidation of unbranched primary alcohols to the corresponding carboxylic acids using HNO3, CrO3/H2SO 4/H2O/acetone, CrO3/CH3COOH, PDC/DMF, H5IO6/CrO3, KMnO4/H +, KMnO4/HO-, NiCl2/NaClO, TEMPO/PhI(OAc)2. Therefore, the product formed is always contaminated with a carboxylic acid containing one carbon atom less. Systems such as PhI(OAc)2/TEMPO or H5IO6/CrO 3/CH3CN reduce to a minimum the content of this impurity. Temperature, the order of reagent addition, and additives such as oxalic acid or cerium salts produce a profound effect on the formation of the undesirable impurity during the Jones oxidation of primary alcohols.
