Relevant bibliographies by topics / Methylène quinone

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  2. Dissertations / Theses
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Academic literature on the topic 'Methylène quinone'

Author: Grafiati
Published: 4 June 2021
Last updated: 12 February 2022

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Journal articles on the topic "Methylène quinone"

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Misran, M., D. Matthews, P. Valente, and A. Hope. "Photochemical Electron Transfer Between Methylene Blue and Quinones." Australian Journal of Chemistry 47, no. 2 (1994): 209. http://dx.doi.org/10.1071/ch9940209.

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Methylene Blue is a well known photochemical oxidant. In this paper we present results of cyclic voltammetry and laser flash photolysis experiments which demonstrate that Methylene Blue may function also as a photochemical reductant. Laser flash photolysis studies of Methylene Blue were carried out in aqueous solution at pH 10, in ethanol and in aqueous dispersions of lipid vesicles in the presence of benzoquinol , benzoquinone and the long-chain naphthoquinone Vitamin K1. Both the quinones and the quinol affected the transient of the decay of triplet Methylene Blue to its ground electronic st
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Zhang, Ling, Xiaoyan Lin, Dayun Huang, Xue Liu, and Xiangmei Wu. "Recent Advances in Triarylmethane Synthesis." Synthesis 52, no. 16 (2020): 2311–29. http://dx.doi.org/10.1055/s-0040-1707115.

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Triarylmethanes are important molecules in organic chemistry. This review discusses advances in their synthesis summarized in five categories according to the starting materials: (1) benzyl reagents with different leaving groups, such as benzyl alcohols, ethers, esters, phosphates, sulfones, thioethers, sulfonamide, 1,3-dicarbonyls, and ammonium salts; (2) reactions via para- or ortho-quinone methides; (3) arylation of benzyl halides; (4) C–H activation of methylenes; and (5) reactions of aldehydes or N-tosylhydrazones. Triarylmethane derivatives such as 9-arylxanthenones, 9-arylfluorenes, and
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Wan, Peter, Beverly Barker, Li Diao, Maike Fischer, Yijian Shi, and Cheng Yang. "1995 Merck Frosst Award Lecture Quinone methides: relevant intermediates in organic chemistry." Canadian Journal of Chemistry 74, no. 4 (1996): 465–75. http://dx.doi.org/10.1139/v96-051.

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ortho and para-Quinone methides (2-methylene-3,5-cyclohexadien-1-one and 4-methylene-2,5-cyclohexadien-1-one, respectively) are intermediates in a variety of important chemical systems. In particular, o-quinone methides are useful in synthesis for the construction of chroman ring systems. A brief account of the relevance of quinone methide chemistry will be provided. This is followed by a review of recent studies from our laboratory on efficient methods for the photogeneration of quinone methides, concentrating on the use of hydroxy-substituted benzyl alcohols in aqueous media. It is shown tha
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Tasqeeruddin, Syed, Yahya Asiri, and Jaber Abdullah Alsherhri. "An Efficient and Green Microwave-Assisted Synthesis of Quinoline DerivativesviaKnoevengal Condensation." Letters in Organic Chemistry 17, no. 2 (2020): 157–63. http://dx.doi.org/10.2174/1570178616666190618153721.

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:We have developed an efficient and green synthesis of quinoline derivatives using L-proline under Knoevenagel condensation. L-proline was found to be an efficient catalyst for the Knoevenagel condensation of substituted 2-aminoaryl ketones 1 with the active methylene compounds 2, affording quinolone derivatives 3. The reaction has been done under conventional as well as under microwave conditions. The latter procedure has been found to be much more efficient in terms of time and yield.
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Vartale, S. P., N. K. Halikar, and Y. D. Pawar. "Synthesis and Antimicrobial Activity of 3-Cyano-4-imino-9-methoxy-4H-pyrimido [2,1-b] pyrimido [4,5-b] quinoline and 2-Substituted Derivatives." Journal of Chemistry 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/862651.

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The 2-amino-7-methoxypyrimido[4,5-b]quinoline (1) on treatment with bis(methylthio)methylene malononitrile (2) in ethyl alcohol and catalytic amount of TEA gives 3-cyano-4-imino-9-methoxy-2-methythio-4H-pyrimido[2,1-b]pyrimido[4,5-b]quinoline (3). The latter were further reacted with selected N-, O-, and C-nucleophiles such as aryl amines, hetryl amines, substituted phenols, and compounds containing an active methylene group.
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Dong, Ying, Dong Liang, Jianjin Huang, and Peng Zhang. "Sesquiterpenes with Quinone Reductase-Inducing Activity from Liriodendron Chinense." Natural Product Communications 4, no. 4 (2009): 1934578X0900400. http://dx.doi.org/10.1177/1934578x0900400403.

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Bioassay-directed separation of the methylene chloride extracts from the wood of Liriodendron chinense led to the isolation of six sesquiterpenes, tulipinolide (1), α-liriodenolide (2), β-liriodenolide (3), lipiferolide (4), 11,13-dehydrolanuginolide (5), and tulipinolide diepoxide (6). Compounds 1-6 have not been found previously in L. chinense. The structures of the compounds were established on the basis of NMR spectroscopic data. All the compounds exhibited quinone reductase (QR)- inducing activity in Hepa lclc7 cells.
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Padilla-Montaño, Nayely, Leandro de León Guerra, and Laila Moujir. "Antimicrobial Activity and Mode of Action of Celastrol, a Nortriterpen Quinone Isolated from Natural Sources." Foods 10, no. 3 (2021): 591. http://dx.doi.org/10.3390/foods10030591.

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Species of the Celastraceae family are traditionally consumed in different world regions for their stimulating properties. Celastrol, a triterpene methylene quinone isolated from plants of celastraceas, specifically activates satiety centers in the brain that play an important role in controlling body weight. In this work, the antimicrobial activity and mechanism of action of celastrol and a natural derivative, pristimerin, were investigated in Bacillus subtilis. Celastrol showed a higher antimicrobial activity compared with pristimerin, being active against Gram-positive bacteria with minimum
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Liao, Xin, Jimin Fang, Lingling Yang, Zhijie Xu, and Xun Wang. "Fluorine-regulated surface chemical state of titanium dioxide (TiO2) and decolourisation mechanism of methylene blue." Environmental Chemistry 18, no. 2 (2021): 71. http://dx.doi.org/10.1071/en20163.

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Environmental contextAs a new type of photocatalytic material, nano-titanium dioxide can be applied in the field of energy and environmental protection. This research uses ammonium bifluoride to modify the titanium dioxide and analyses it in combination with interface chemistry theory, and finds that its photocatalytic efficiency has been greatly improved. This provides new ideas for wastewater treatment and pollutant degradation. AbstractTitanium dioxide (TiO2) was prepared by hydrothermally adjusting titanium sulfate with ammonium hydrogen fluoride. The UV-visible absorption spectra show tha
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Rogerio, Kamilla Rodrigues, Cedric Stephan Graebin, Luiza Helena Pinto Domingues, et al. "Novel Quinolinyl-pyrrolo[3,4-d]pyrimidine-2,5-dione Derivatives Against Chloroquine-resistant Plasmodium falciparum." Current Topics in Medicinal Chemistry 20, no. 2 (2020): 99–110. http://dx.doi.org/10.2174/1568026619666191019100711.

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Introduction: In this work DHPMs were combined with the quinoline nucleus to obtain new quinolinyl-pyrrolo[3,4-d]pyrimidine-2,5-dione compounds with improved antiplasmodial activity as well as decreased cytotoxicity. Nineteen quinolinyl-pyrrolo[3,4-d]pyrimidine-2,5-dione derivatives connected by a linker group to quinolone ring moieties with different substituents were synthesized and assayed against P. falciparum. Materials and Methods: Nineteen quinolinyl-pyrrolo[3,4-d]pyrimidine-2,5-dione derivatives connected by a linker group to quinoline ring moieties with different substituents were syn
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Yanni, Amal S. "Synthesis of some new indolizino[2,3-g]quinoline-5,12-dione derivatives." Collection of Czechoslovak Chemical Communications 56, no. 3 (1991): 695–701. http://dx.doi.org/10.1135/cccc19910695.

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Interaction of 6,7-dichloroquinoline-5,8-dione (I) with active methylene compounds and pyridine (or substituted pyridine) afforded indolizino[2,3-g]quinoline-5,12-diones (III, IV). When quinoline or isoquinoline was used instead of pyridine in the above reaction benzo[5,6]- or benzo[7,8]-indolizino[2,3-g]quinoline-5,12-diones (V, VI) were obtained. Their structure has been ascertained through elemental and spectral analysis.
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Dissertations / Theses on the topic "Methylène quinone"

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Miazimbakana, Joseph. "Préservation du bois par modification chimique de sa structure : synthèse et étude de réactivité de nouveaux précurseurs de méthylène quinones." Nancy 1, 1990. http://www.theses.fr/1990NAN10014.

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Le groupement azidométhylène, groupement protecteur de la fonction phénol, est utilisé pour préparer des phénols peu stables. Ces derniers sont des précurseurs de méthylène quinone. La réactivité vis-à-vis de différents nucléophiles des méthylènes quinones libérées in situ est étudiée. Parmi ces nucléophiles, le méthanol et divers phénols sont considérés comme des modèles de cellulose et de lignine. Une modification de la structure chimique du bois et de la cellulose par les méthylène quinones est entreprise en vue de préserver le bois contre les attaques des microorganismes. Une protection ce
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Jiang, Xiao-Wu. "Synthetic studies towards conocurvone : a novel synthesis of trimeric quinone via the first reactions of carbene complex with conjugated triynes /." 2002. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:3070177.

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Tai-Chi, Wang, and 王泰吉. "Synthesis And Biological Activity Evaluation of Quinoline And Quinolin-2(1H)-one a-Methylene-g-butyrolactones." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/87526227498769038220.

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博士<br>高雄醫學院<br>藥學研究所<br>87<br>The quinoline and quinolin-2(1H)-one a-methylene-g-butyrolactones were synthesized from hydroxyquinoline and hydroxyquinolin-2(1H)-one via alkylation and Reformatsky-type condensation. The key precursors of hydroxyquinolin-2(1H)-ones were prepared from methoxyanilines and cinnamoyl chloride to give the respective methoxycinnamanilides. Their cyclization with aluminum chloride in chlorobenzene at 120°C afforded the desired intramolecular Friedel-Crafts cyclization products of hydroxy- quinolin-2(1H)-ones in good overall yield. To o
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Book chapters on the topic "Methylène quinone"

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Griesbeck, A. G. "Michael Addition and Subsequent Cyclization of CH-Active Methylene Compounds." In Quinones and Heteroatom Analogues. Georg Thieme Verlag KG, 2006. http://dx.doi.org/10.1055/sos-sd-028-00611.

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