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Relevant bibliographies by topics / Cyclic ketones structure

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Academic literature on the topic 'Cyclic ketones structure'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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Journal articles on the topic "Cyclic ketones structure"

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Kroll, M. H., N. A. Roach, B. Poe, and R. J. Elin. "Mechanism of interference with the Jaffé reaction for creatinine." Clinical Chemistry 33, no. 7 (1987): 1129–32. http://dx.doi.org/10.1093/clinchem/33.7.1129.

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Abstract We investigated the mechanism of the Jaffé reaction for determination of creatinine by studying the spectrophotometric, kinetic, and equilibrium properties of the reaction of picrate with creatinine and with cyclic and aliphatic ketones. Absorbance spectra for the reaction products of picrate with all the ketones were superimposable with that of creatinine (Amax, 490 nm). Cyclic ketones not containing nitrogen had a molar absorptivity less than half that of creatinine and equilibrium constants approximately 0.01 that of creatinine. Aliphatic ketones, except for benzylacetone, had mola

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Gliński, Marek, Dorota Armusiewicz, Karolina Łukasik-Kwaśniewska, et al. "Diastereoselective Transfer Hydrogenation of Cyclic and Bicyclic Ketones over Selected Metal Oxides as Catalysts." Molecules 30, no. 10 (2025): 2153. https://doi.org/10.3390/molecules30102153.

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The diastereoselectivity of the liquid- and vapor-phase Catalytic Transfer Hydrogenation (CTH) of cyclic ketones: x-methylcyclohexanones (x = 2, 3 or 4), 4-t-butylcyclohexanone, and bicyclic ketones: 2-norbornanone, camphor, fenchone, and a tricyclic ketone (2-adamantanone) with secondary alkanols (2-propanol, 2-butanol, 2-pentanol, or 2-octanol) as hydrogen donors in the presence of ten metal oxides as the catalysts was studied. Among the oxides, only four, namely, MgO, ZrO2·nH2O, ZrO2, and Al2O3, exhibited good or high activity. The reaction products are diastereoisomeric alcohols, the relat

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Yamamoto, Yasunori, Takashi Nishikata та Norio Miyaura. "1,4-Additions of arylboron, -silicon, and -bismuth compounds to α,β-unsaturated carbonyl compounds catalyzed by dicationic palladium(II) complexes". Pure and Applied Chemistry 80, № 5 (2008): 807–17. http://dx.doi.org/10.1351/pac200880050807.

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An enantioselective synthesis of cyclic and acyclic β-aryl ketone and aldehydes via Pd(II)-catalyzed 1,4-addition of Ar-m [m = B(OH)2, BF3K, Si(OMe)3, SiF3, BiAr2] to α,β-unsaturated ketones or aldehydes is described. The catalytic cycle involves transmetallation between Ar-m and Pd complexes as a key process, the mechanism of which is discussed on the basis of characterization of the transmetallation intermediate and electronic effect of the substituents. The enantioselection mechanism and efficiency of a chiraphos ligand for structurally planar α,β-unsaturated ketones are discussed on the ba

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Bhacca, N., and L. Klasinc. "Photoelectron Spectra and Electronic Structure of Some Steroids." Zeitschrift für Naturforschung A 40, no. 7 (1985): 706–8. http://dx.doi.org/10.1515/zna-1985-0709.

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Gas phase Hel photoelectron spectra of 5ɑ-androstane, 5ɑ-androstan-3-one and 5ɑ-androstan- 17-one compared with those of other saturated cyclic hydrocarbons and ketones indicated that the electronic effect of a keto group in steroids is rather local i.e. extending over about two rings.

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Sevenard, Dmitri V., Oleg G. Khomutov, Nadezhda S. Boltachova, et al. "Metal and Boron Derivatives of Fluorinated Cyclic 1,3-Dicarbonyl Compounds." Zeitschrift für Naturforschung B 64, no. 5 (2009): 541–50. http://dx.doi.org/10.1515/znb-2009-0510.

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Starting from the corresponding cyclic 1,3-diketones or other precursors (cyclic ketones as well as lactones), several new salts and chelate complexes of fluorinated 1,3-dicarbonyls were obtained. Their preparative significance was demonstrated by straightforward syntheses of fluorinated pyrazoles, benzimidazoles and 1,7-ketoesters. The structure of a boron chelate of 2-(trifluoroacetyl)- cyclohexanone was investigated by X-ray diffraction.

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Ma, Jinyi, Aqun Zheng, Qin Pan, et al. "The Synthesis of Sn-Containing Silicates Coated with Binaphthol and Their Specific Application for Catalytic Synthesis of 6-Hydroxyhexanoic Acid and Cyclohexylformate through Baeyer-Villiger Oxidation." Catalysts 13, no. 5 (2023): 805. http://dx.doi.org/10.3390/catal13050805.

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The Baeyer–Villiger oxidation (BVO) of ketone and aldehyde can produce ester and formate, which both have wide applications in many areas. In this work, a series of Sn-containing silicates were prepared through the sol-gel process by using structure-directing and crystallizing agents and post-synthetic coordinated modification of binaphthol. Characterizations revealed that loading of (L)-sodium lactate as the crystallizing agent decreased the crystal size of the synthesized catalyst, and there were SnO2 nanoparticles with sizes of 17–19 nm on the catalyst. Furthermore, quite differently from t

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Brown, M. A., and D. G. Tuck. "Crystallographic and spectroscopic studies of adducts of indium (III) iodide with two cyclic ketones." Canadian Journal of Chemistry 78, no. 5 (2000): 536–41. http://dx.doi.org/10.1139/v00-049.

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Indium(III) iodide forms a 1:1 adduct with 9-xanthenone, of quasi-tetrahedral structure; triclinic, a = 10.805(4), b = 11.494(4), c = 7.493 (2) Å, α = 104.12(3), β = 106.35(3), γ = 91.165(3)°, V = 860.8(5) Å3, Z = 2, space group P1-. With 9-fluorenone, the adduct has 1:2 stoichiometry, and approximately D3h symmetry in the InI3O2 kernel; the structure is triclinic, a =11.212(2), b = 16.504(3), c = 7.537(2) Å, α = 94.57(2), β = 109.05(1), γ = 91.165(15)°, V = 1312.6(4) Å3, Z = 2, space group P1-. The solid structures, and the solution chemistry, are compared with those of related neutral deriva

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Mill, Sibel, and Claude Hootelé. "A revised structure for the piperidine alkaloid andrachamine." Canadian Journal of Chemistry 74, no. 12 (1996): 2434–43. http://dx.doi.org/10.1139/v96-272.

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A new method for the synthesis of trans-2,6-disubstituted piperidine derivatives is described. The transformation of cyclic α-methoxycarbamates 5 and 6 affords trans ketones 17 and 18. The synthesis of diols 1–4 from 17 and 18 has shown that the structure proposed in the literature for the piperidine alkaloid andrachamine is incorrect. A reexamination of the original spectral data of this alkaloid suggested that it is a meso 2,6-disubstituted piperidine derivative. Unambiguous syntheses of 23 and 24 and comparison with a sample of andrachamine have established that this alkaloid possesses stru

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DOUSTDAR, Omid, Miroslaw WYSZYNSKI, Athanasios TSOLAKIS, and Hamid MAHMOUDI. "Bio-ketones from lignocellulosic biomass: experimental investigation on fuel properties, combustion and emissions characteristics of cyclopentanone blend with diesel in compression ignition engine." Combustion Engines 171, no. 4 (2017): 81–86. http://dx.doi.org/10.19206/ptnss-2017-414.

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Use of alternative fuels in compression ignition engines is the topic for many studies. This paper presents the results of lubricity, calorific value, viscosity, surface tension and density of a ketone blend with diesel to use as a fuel in compression ignition engine. Analyses of fuel properties are vital due to their effect on fuel system. In addition, this study is related to the development of future biofuels and it indicates the effect of oxygen double bond in molecular structure of ketones on important fuel properties. Cyclopentanone which has cyclic molecular structure was used; it can b

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Li, Xinzhong, Hanyu Xue, Qi Lin, and Aimin Yu. "Additive-Free Baeyer–Villiger Oxidation of Cyclic Ketone Catalyzed by Carboxylic-Functionalized Poly(Ionic Liquids) and Polyoxometalate Ionic Self-Assemblies." Catalysts 10, no. 1 (2020): 127. http://dx.doi.org/10.3390/catal10010127.

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Two carboxylic functionalized poly(ionic liquids) and polyoxometalate ionic self-assemblies with tunable amphiphilic and oxidative activity and porous structure were designed and synthesized. They were used as efficient heterogeneous catalysts exhibiting excellent catalytic activity and quite stable reusability in additive–free Baeyer-Villiger oxidation of cyclic ketones, directly using 30% H2O2 solution in liquids–phase. Under optimum conditions, the corresponding lactones were obtained with yields ranging from 59.6 to 90.5%. The unique combination of carboxylic group with polyoxometalate ani

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Dissertations / Theses on the topic "Cyclic ketones structure"

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Laduranty, Joëlle. "Mise au point de la préparation de molécules polyfonctionnelles comportant l'unité structurale SCCN de la cystéamine : applications en radioprotection et synthèse organique." Poitiers, 1988. http://www.theses.fr/1988POIT2013.

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Book chapters on the topic "Cyclic ketones structure"

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Meguro, Yasuhiro, Masaru Enomoto, and Shigefumi Kuwahara. "Total Synthesis of Amycolamicin." In Modern Natural Product Synthesis. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-1619-7_2.

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AbstractAmycolamicin (also called kibdelomycin) produced by two species of soil actinomycetes is a potent antibiotic against a broad range of drug-resistant bacteria with a novel binding mode to bacterial type II DNA topoisomerases and with no cross-resistance to existing antibacterial agents. The unique hybrid molecular architecture of amycolamicin attracted interest of many synthetic organic chemists and three total syntheses have been reported so far. In this chapter, we describe our total synthesis of amycolamicin in detail, which features a nucleophilic addition of a vinyllithiun reagent

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Roush, W. R., and R. J. Sciotti,. "Total Synthesis of (–)-Chlorothricolide." In Exercises in Synthetic Organic Chemistry. Oxford University PressOxford, 1997. http://dx.doi.org/10.1093/oso/9780198559443.003.0070.

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Abstract Discussion Points Propose suitable methods for the synthesis of optically active alcohol 1 from its corresponding ketone. Suggest a mechanism for the iodination of compound 2. What is the purpose of the DIBAL-H in the sequence? Give the mechanism of step f. Explain the stereoselectivity of steps g and i. What is the structure of 7 introduced in step j? Rationalise both the mechanism and stereocontrol that led to the cyclic system 8, the major product of step j. What is the purpose of the 2-methyl-2-butene used in step r?

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"Biocatalytic Disconnections and Functional Group Interconversions." In Biocatalysis in Organic Synthesis: The Retrosynthesis Approach. The Royal Society of Chemistry, 2018. http://dx.doi.org/10.1039/bk9781782625308-00268.

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This chapter introduces the idea of developing a structured approach to the disconnection of target molecules based on biocatalytic retrosynthesis. The reader will be guided through the various disconnections that are possible, both for acyclic and cyclic systems, in order to gain an understanding of where biocatalysts can be applied in organic synthesis. The various disconnections possible are organised into one of five different groups: (i) acyclic systems: substituted alcohols, amines, carboxylic acids, ketones etc. (1 functional group); (ii) acyclic systems: 1,2-, 1,3-, and 1,4-diols, hydr

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Schobert, Rainer. "Applications of the Wittig reaction in the synthesis of heterocyclic and carbocyclic compounds." In Organophosphorus Reagents. Oxford University PressOxford, 2004. http://dx.doi.org/10.1093/oso/9780198502623.003.0005.

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Abstract Since its discovery, the Wittig olefination reaction has been widely used in organic synthesis for the construction of olefinic double bonds from various types of carbonyl functionalities (aldehydes, ketones, esters, amides, etc.) and phosphorus ylides of different reactivity. Although the mechanism of this important C=C bond forming process is still under debate, insights into the principles governing its regio- and stereoselectivity are now sufficiently deep, to allow for it, to be harnessed reliably in retrosynthetic strategies. From the early days of ‘Wittig chemistry’, its possib

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Naz, Tahira, Shaista Nosheen, Yusuf Nazir, and Yuanda Song. "Aliphatic Hydrocarbons." In Fungal Lipid Biochemistry. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815123012123010012.

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Aliphatic compounds are carbon and hydrogen-containing hydrocarbon complexes and are present in almost every plant, animal and microorganism. In 1929, aliphatic hydrocarbons were first discovered by crude chemical methods. These observations were later confirmed and expanded by more sophisticated instruments, such as gas-liquid chromatography and GLC-mass spectrometry. Aliphatic hydrocarbons were detected in the wax of most studied organisms and mainly contained n-alkanes, but may also include n-alkenes, saturated and unsaturated, cyclic alkanes, and isoprenoid hydrocarbons. Similarly, surface

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"Cellular metabolism." In Oxford Assess and Progress: Medical Sciences, edited by Jade Chow, John Patterson, Kathy Boursicot, and David Sales. Oxford University Press, 2012. http://dx.doi.org/10.1093/oso/9780199605071.003.0014.

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Cellular metabolism is divided into catabolism — responsible for converting nutrients into the energy sources and smaller molecules required for the chemical reactions of the body — and anabolism, which is the interconversion and synthesis of the molecules that maintain the body’s structure and function. This chapter examines the control of metabolism and the central metabolic pathways. Such control includes compartmentalization of metabolic processes and the cooperation between the metabolic activities of different organs. Metabolic control is important because metabolism must match the avail

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Taber, Douglass F. "C–O Ring Construction: The Tong Synthesis of (−)-Aculeatin A." In Organic Synthesis. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190646165.003.0045.

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Oxetanes are both interesting structural elements and activated leaving groups. James A. Bull of Imperial College London cyclized (Chem. Commun. 2014, 50, 5203) the tosylate 1 to the oxetane with LiHMDS, then alkylated the product using the same base to give 2. J. S. Yadav of CSIR-Indian Institute of Chemical Technology established (Org. Lett. 2014, 16, 836) conditions for the cyclization of 3 to 4. Hiroaki Sasai of Osaka University used (Chem. Commun. 2013, 49, 11224) a Pd(II)–Pd(IV) cycle to convert 5 to 6. Lauri Vares of the University of Tartu demonstrated (Tetrahedron Lett. 2014, 55, 35

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Taber, Douglass F. "The Smith Synthesis of (−)-Calyciphylline N." In Organic Synthesis. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190646165.003.0095.

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The Daphniphyllum alkaloids are a diverse group, some of which exhibit potent biological activity. Amos B. Smith III of the University of Pennsylvania envisioned (J. Am. Chem. Soc. 2014, 136, 870) the preparation of the bicyclo[2.2.2] core of (−)-calyciphylline N 3 by the intramolecular Diels–Alder cyclization of 1 to 2, with the silicon of 2 a surrogate for the secondary alcohol of 3. Following the precedent of Mori (Tetrahedron Asymm. 2005, 16, 685), the requisite secondary center of 1 was set by methylation of the anion derived from the Evans acyl oxazolidinone 4. Reductive removal of the

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Conference papers on the topic "Cyclic ketones structure"

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Rodríguez-Mondéjar, Carlos, Álvaro Rodríguez-Prieto, and Ana María Camacho. "Estimation of Maximum Flow Length for CF-PEEK Overmolded Grid Structures Using the Finite Element Method." In ASME 2021 16th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/msec2021-62311.

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Abstract Injection overmolding process is a high versatile process that permits, when used in combination with fiber reinforced thermoplastic composites, the obtaining of high mechanical properties structures with complex geometries in short time cycles. The maximum flow length is a parameter that reflects the success of filling in a polymer injection molding process. Geometry of the part, rheological properties of the polymer and process parameters, such as injection pressure and temperature, are involved on the value of this parameter and therefore on the viability of a certain configuration

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KASHMARI, KHATEREH, HASHIM AL MAHMUD, SAGAR U. . PATIL, et al. "MOLECULAR DYNAMICS MODELING OF PEEK RESIN PROPERTIES FOR PROCESSING MODELING." In Proceedings for the American Society for Composites-Thirty Eighth Technical Conference. Destech Publications, Inc., 2023. http://dx.doi.org/10.12783/asc38/36588.

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thermoplastic composites. This study implemented molecular dynamics (MD) modeling to predict the thermo-mechanical properties and volumetric shrinkage of PolyEther Ether Ketone (PEEK) resin, a thermoplastic material, as a function of temperature and crystallinity content. The thermo-mechanical properties are linked to processing time and temperature via crystallization-kinetics models.The remarkable properties of Thermoplastic Matrix Composites (TMCs) including their ability to tolerate damage, low weight, high resistance to impact, and mechanical toughness, make them highly desirable for use

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Friedman, Emily, Madeline Krzystowczyk, and Genevieve Palardy. "ENABLING ASSEMBLY AND REPAIR OF DISSIMILAR THERMOPLASTIC COMPOSITES FOR SPACE APPLICATIONS VIA ULTRASONIC WELDING." In SAMPE 2025 Indianapolis. Society for the Advancement of Material and Process Engineering, 2025. https://doi.org/10.33599/nasampe/s.25.0129.

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The need to repair or reuse thermoplastic composite (TPC) materials is of growing concern, particularly for lightweight space structures in a lunar environment. Ultrasonic welding (USW) applies vibration at the joint to create heat, which enables assembly and potentially, repair. An energy director (ED) can be used to concentrate the vibration at the interface by quickly absorbing the energy and melting. In this work, dissimilar ED materials are used to assemble and repair ultrasonically welded joints to determine the effect of different melting temperatures on failure modes. Single lap shear

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