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Journal articles on the topic 'Cyclic ketones structure'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

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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2

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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3

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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4

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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5

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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6

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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7

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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8

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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9

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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10

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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11

Faizullina, L. Kh, and N. P. Akhmetdinova. "CYCLIC ACETALS AND KETALS – VALUABLE PRECURSORS IN ORGANIC SYNTHESIS." Izvestia Ufimskogo Nauchnogo Tsentra RAN, no. 4 (December 10, 2024): 11–32. https://doi.org/10.31040/2222-8349-2024-0-4-11-32.

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Acetals and ketals are a latent form of carbonyl compounds and important intermediates in synthetic and carbohydrate chemistry. There is probably not a single scheme for the synthesis of biologically active compounds in which the technique with diol protection of the carbonyl function has not been used at least once. This is due to the convenience of both setting up the protective group and removing it. Classical synthesis involves the addition of alcohols to aldehydes and ketones in slightly acidic or basic solutions. Before the stage of formation of hemiacetals, the reaction is catalyzed by

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12

Iwaki, Hiroaki, Shaozhao Wang, Stephan Grosse, et al. "Pseudomonad Cyclopentadecanone Monooxygenase Displaying an Uncommon Spectrum of Baeyer-Villiger Oxidations of Cyclic Ketones." Applied and Environmental Microbiology 72, no. 4 (2006): 2707–20. http://dx.doi.org/10.1128/aem.72.4.2707-2720.2006.

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ABSTRACT Baeyer-Villiger monooxygenases (BVMOs) are biocatalysts that offer the prospect of high chemo-, regio-, and enantioselectivity in the organic synthesis of lactones or esters from a variety of ketones. In this study, we have cloned, sequenced, and overexpressed in Escherichia coli a new BVMO, cyclopentadecanone monooxygenase (CpdB or CPDMO), originally derived from Pseudomonas sp. strain HI-70. The 601-residue primary structure of CpdB revealed only 29% to 50% sequence identity to those of known BVMOs. A new sequence motif, characterized by a cluster of charged residues, was identified

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13

Dorofeev, Ivan A., Larisa V. Zhilitskaya, Nina O. Yarosh та Bagrat A. Shainyan. "2-Amino-1,3-benzothiazole: Endo N-Alkylation with α-Iodo Methyl Ketones Followed by Cyclization". Molecules 28, № 5 (2023): 2093. http://dx.doi.org/10.3390/molecules28052093.

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Reactions of 2-amino-1,3-benzothiazole with aliphatic, aromatic and heteroaromatic α-iodoketones in the absence of bases or catalysts have been studied. The reaction proceeds by N-alkylation of the endocyclic nitrogen atom followed by intramolecular dehydrative cyclization. The regioselectivity is explained and the mechanism of the reaction is proposed. A number of new linear and cyclic iodide and triiodide benzothiazolium salts have been obtained and their structure proved by NMR and UV spectroscopy.

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14

Ramos, J. J., V. K. Díez, C. A. Ferretti, P. A. Torresi, C. R. Apesteguía та J. I. Di Cosimo. "Gas-phase reduction of cyclic and acyclic α,β-unsaturated ketones by hydrogen transfer on MgO. Effect of the ketone structure". Catalysis Today 172, № 1 (2011): 41–47. http://dx.doi.org/10.1016/j.cattod.2011.02.034.

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15

Zhao, Na, Yu Li, Jinzhong Gu, Marina V. Kirillova, and Alexander M. Kirillov. "Synthesis, Structural Features, and Catalytic Activity of an Iron(II) 3D Coordination Polymer Driven by an Ether-Bridged Pyridine-Dicarboxylate." Crystals 9, no. 7 (2019): 369. http://dx.doi.org/10.3390/cryst9070369.

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New iron(II) three-dimensional coordination polymer (3D CP), [Fe(µ3-Hcpna)2]n (1), was assembled under hydrothermal conditions from 5-(4’-carboxyphenoxy)nicotinic acid (H2cpna) as a trifunctional organic N,O-building block. This stable microcrystalline CP was characterized by standard methods for coordination compounds in the solid state (infrared spectroscopy, elemental analysis, thermogravimetric analysis, powder and single-crystal X-ray diffraction). Structure and topology of 1 were examined and permitted an identification of a 3,6-connected framework of the rtl topological type. In additio

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16

Shuvalov, Vladislav, Anna Rupp, Anna Kuratova, Alexander Fisyuk, Andrey Nefedov та Galina Sagitullina. "Synthesis of δ-Carbolines and the Alkaloid Quindoline through a Molybdenum-Catalyzed Cadogan Cyclization and their Photoluminescent Properties". Synlett 30, № 08 (2019): 919–23. http://dx.doi.org/10.1055/s-0037-1612416.

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Cadogan reductive cyclization of substituted 2-aryl-3-nitropyridines to give δ-carbolines was performed under MoO2Cl2(DMF)2 catalysis with triphenylphosphine as a ligand. A new approach for the synthesis of the alkaloid quindoline based on a Mo(VI)-catalyzed Cadogan reductive cyclization of 2-phenyl-3-nitro-5,6,7,8-tetrahydroquinoline followed by aromatization of the resulting 2,3,4,10-tetrahydro-1H-indolo[3,2-b]quinoline is proposed. Various о-nitroarylpyridines, obtained by reacting acylpyruvates and cyclic hydroxymethylene ketones with nitroacetophenone enamines, were used as starting compo

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17

Sürig, Thomas, and Hans-Friedrich Grützmacher. "Charge-Reversal mass spectra of enolate ions of some open-chain and cyclic ketones for structure identification." Organic Mass Spectrometry 25, no. 9 (1990): 446–52. http://dx.doi.org/10.1002/oms.1210250903.

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18

Scott, J. W., L. M. Davis, D. Shannon, and C. Kaplan. "Relation of chemical structure to spatial distribution of sensory responses in rat olfactory epithelium." Journal of Neurophysiology 75, no. 5 (1996): 2036–49. http://dx.doi.org/10.1152/jn.1996.75.5.2036.

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1. Electroolfactogram (EOG) recordings were made in three configurations from the rat olfactory epithelium. Each configuration compared recordings in the dorsomedial recess of the epithelium with recordings in ventral or lateral parts of the epithelium. Most comparisons were made with simultaneous recordings. The exception was a series in which the dorsal recess and lateral space between the base of two turbinate bones were directly exposed for odor application and recording. The spatial distributions of maximal responses were largely independent of recording configuration. 2. Simultaneous rec

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19

R., Bhavapriya, George Leema, Vidya R., Venkatraman M., Tamizhselvi R., and I. Sathiyanarayanan K. "Antimicrobial assay on synthetic phenanthridine derivatives." Journal Of Indian Chemical Society Vol. 92, Jun 2015 (2015): 854–56. https://doi.org/10.5281/zenodo.5636300.

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School of Biosciences and Technology, School of Advanced Sciences, VIT University, Vellore-632 014, Tamilnadu, India <em>E-mail</em> : rvidya@vit.ac.in Nowadays lots of efforts have been made to identify synthetic pharmacophores with the aim to reverse, inhibit and retard the pathogenic process. With this regard we have synthesized phenanthridine (PHE) derivatives which are polycyclic nitrogenous heterocyclic with planar structure. These derivatives have been synthesized using Mannich approach where alterations were made between cyclic ketones and aromatic aldehyde. Other phenanthridine deriva

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20

Bilyachenko, Alexey N., Victor N. Khrustalev, Evgenii I. Gutsul, et al. "Hybrid Silsesquioxane/Benzoate Cu7-Complexes: Synthesis, Unique Cage Structure, and Catalytic Activity." Molecules 27, no. 23 (2022): 8505. http://dx.doi.org/10.3390/molecules27238505.

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A series of phenylsilsesquioxane-benzoate heptacopper complexes 1–3 were synthesized and characterized by X-ray crystallography. Two parallel routes of toluene spontaneous oxidation (into benzyl alcohol and benzoate) assisted the formation of the cagelike structure 1. A unique multi-ligation of copper ions (from (i) silsesquioxane, (ii) benzoate, (iii) benzyl alcohol, (iv) pyridine, (v) dimethyl-formamide and (vi) water ligands) was found in 1. Directed self-assembly using benzoic acid as a reactant afforded complexes 2–3 with the same main structural features as for 1, namely heptanuclear cor

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21

Smetanin, N. V., S. A. Varenichenko, A. V. Mazepa, O. K. Farat, A. V. Kharchenko, and V. I. Markov. "Atom-economic Michael reaction between hydroacridines and arylmaleimides without catalyst/additive." Voprosy Khimii i Khimicheskoi Tekhnologii, no. 5 (October 2022): 102–9. http://dx.doi.org/10.32434/0321-4095-2022-144-5-102-109.

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Previously unknown spiroderivatives of 3,1-benzoxazines were synthesized by the reaction of anthranilic acid with cyclic ketones. The interaction of 3,1-spirobenzoxazines with Vilsmeier-Haack reagent (POCl3 (PBr3)/DMF), depending on the amount of formulation agent, leads to the formation of hydroacridones or hydroacridines. Under catalyst- and additive-free conditions, N-arylmaleimides, like Michael's acceptors, are added to the hydroacridines in DMSO to form the corresponding adducts. The reaction proceeds stereoselectively with the formation of a mirror pair of diastereomers, if the products

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22

Du, Ganhong, Jun Ling, Fangyu Hu, Keyuan Liu, Long Ye, and Liming Jiang. "Bioinspired Polymer-Bound Organocatalysts for Direct Asymmetric Aldol Reaction: Experimental and Computational Studies." Catalysts 9, no. 5 (2019): 398. http://dx.doi.org/10.3390/catal9050398.

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A series of poly(2-oxazoline) (POX) derivatives bearing prolinamide pendants were designed as organocatalysts and evaluated in the direct asymmetric aldol reaction between aromatic aldehydes and cyclic ketones. The structural variation of the alkyl spacer connecting the polymer backbone with the catalytic unit was applied so as to deduce structure–performance relationships combined with comparable experiments from model catalysts. Results showed that the POX-bound prolinamides can promote the aldol reaction more effectively as compared to their small-molecular and non-POX-bound analogs. The ca

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23

Pytela, Oldřich. "A new classification of solvents based on chemometric empirical scale of parameters." Collection of Czechoslovak Chemical Communications 55, no. 3 (1990): 644–52. http://dx.doi.org/10.1135/cccc19900644.

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The paper presents a classification of 51 solvents based on clustering in three-dimensional space formed by the empirical scale of PAC, PBC, and PPC parameters designed for interpretation of solvent effect on a model with cross-terms. For the classification used are the clustering methods of the nearest neighbour, of the furthest neighbour, of average bond, and the centroid method. As a result, the solvents have been divided into 8 classes denoted as: I - nonpolar-inert solvents (aliphatic hydrocarbons), IIp - nonpolar-polarizable (aromatic hydrocarbons, tetrachloromethane, carbon disulphide),

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24

Subhankar, Kundu, Sarkar Deblina, Biswas Sujan, Jana Subrata, and Kumar Mondal Tapan. "Ruthenium-triphenylphosphine complex with pendent quinolyl Schiff base ligand : Synthesis, spectral characterization and catalytic property." Journal of Indian Chemical Society Vol. 92, Dec 2015 (2015): 1847–53. https://doi.org/10.5281/zenodo.5599621.

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Inorganic Chemistry Section, Department of Chemistry, Jadavpur University, Kolkata-700 032, India <em>E-mail</em> : tkmondal@chemistry.jdvu.ac.in The <em>cis</em>-(Cl)-[Ru(PMAQ)(PPh<sub>3</sub> )Cl<sub>2</sub> ] (1) (where, PMAQ = 8-{(2´-pyridylmethylene)amino}quinoline) complex has been synthesized and characterized by several spectroscopic techniques. The absorption and emission properties of the complex have been studied. Upon excitation in ILCT band at 331 nm, the complex exhibits emission at 475 nm. The emission decay profile has bi-exponential in nature with life time of 3.98 ns. T

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25

Kuchmenko, T. A., D. A. Poryadina, and D. A. Kuchmenko. "New way of definition of an androstenon." Proceedings of the Voronezh State University of Engineering Technologies 81, no. 1 (2019): 276–81. http://dx.doi.org/10.20914/2310-1202-2019-1-276-281.

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By means of "an electronic nose" the problem of detection in salted pork fat of an androstenon is solved, even small concentration of which negatively affect consumer appeal of a product. The massif from eight differently selective gas sensors is applied to detecting of an androstenon. The massif is previously trained on easily volatile compounds of various classes (alcohols, ketones, water, nitrogen-containing connections). Significant differences in analytical signals of the massif of sensors at the maintenance of an androstenon in model test of salted pork fat at the level of 0.5 threshold

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26

Ueda, T., C. M. Kam, and J. C. Powers. "The synthesis of arginylfluoroalkanes, their inhibition of trypsin and blood-coagulation serine proteinases and their anticoagulant activity." Biochemical Journal 265, no. 2 (1990): 539–45. http://dx.doi.org/10.1042/bj2650539.

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Seven arginylfluoroalkanes (‘arginine fluoroalkyl ketones’) were synthesized by using a modified Dakin-West procedure. The structure of benzoyl-Arg-CF2CF3 was analysed by 19F-n.m.r. spectroscopy and m.s. and the compound was shown to exist primarily as a hydrate or cyclic carbinolamine. Arginylfluoroalkanes are good inhibitors of blood-coagulation serine proteinases and were found to be slow-binding inhibitors for bovine trypsin with Ki values of 0.2-56 microM. Benzoyl-Arg-CF2CF3 was the best inhibitor for bovine thrombin and human Factor XIa, and inhibited thrombin and Factor XIa competitivel

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alkawaldeh, Ahmad khalaf. "Cyclic voltammogram analysis of the environmental aspects of the use of ferrocenyl carbinols." International Journal of Engineering and Artificial Intelligence 2, no. 4 (2021): 7–12. http://dx.doi.org/10.55923/jo.ijeal.2.4.102.

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Ferrocene and its derivatives have ecologically effective antidetane properties. In this regard, ferrocene reacts with cyclic ketones and ferrosenylcarbinols are synthesized. It should be noted that ferrocene enters into electrophilic reactions and the process takes place in an acidic environment. In addition, the yield of the new product was small compared to the reactions of ferrocene with non-cyclic ketones. This is due to the spatial structures of molecules. The elemental analysis of obtained compounds was carried out; the structures were researched by cyclic voltammograms and Chronoampero

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alkawaldeh, Ahmad. "Cyclic voltammogram analysis of the environmental aspects of the use of ferrocenyl carbinols." International Journal of Engineering and Artificial Intelligence 2, no. 4 (2021): 7–12. http://dx.doi.org/10.55923/jo.ijeal.2.4.202.

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Ferrocene and its derivatives have ecologically effective antidetane properties. In this regard, ferrocene reacts with cyclic ketones and ferrosenylcarbinols are synthesized. It should be noted that ferrocene enters into electrophilic reactions and the process takes place in an acidic environment. In addition, the yield of the new product was small compared to the reactions of ferrocene with non-cyclic ketones. This is due to the spatial structures of molecules. The elemental analysis of obtained compounds was carried out; the structures were researched by cyclic voltammograms and Chronoampero

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Rohit, Kumar, Paul Piyali, and Bhattacharya Samaresh. "N-(Aryl)pyrrole-2-aldimine complexes of ruthenium: Synthesis, characterization and catalytic transfer-hydrogenation." Journal of Indian Chemical Society Vol. 95, Jul 2018 (2018): 721–28. https://doi.org/10.5281/zenodo.5638362.

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Department of Chemistry, Inorganic Chemistry Section, Jadavpur University, Kolkata-700 032, India <em>E</em>-<em>mail:</em> samaresh_b@hotmail.com <em>Manuscript received 28 June 2018, accepted 10 July 2018</em> Reaction of N-(4'-R-phenyl)pyrrole-2-aldimines (HL-R, where H represents the acidic N-H hydrogen and, R = OCH<sub>3</sub>, CH<sub>3</sub>, H and CI) with [Ru(bpy)<sub>2</sub>(EtOH)<sub>2</sub>]<sup>2+</sup>, formed <em>in situ</em> via Ag<sup>+</sup>-assisted removal of the chlorides from [Ru(bpy)<sub>2</sub>Cl<sub>2</sub>] in ethanolic medium, affords a group of pinkish-brown

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Wei, Yuli, Zhiwang Yang, Guohu Zhao, and Wu Yang. "Synthesis and catalytic properties of macroporous SiO2-coated CNT-sieve-composite-supported 12-tungstophosphoric acid catalysts with dual pore structure for the Baeyer–Villiger oxidation of cyclic ketones under microwave irradiation." Journal of Catalysis 371 (March 2019): 196–206. http://dx.doi.org/10.1016/j.jcat.2019.01.007.

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Fyfe, C. A., and M. S. McKinnon. "High-resolution 13C CP/MAS solid-state nmr investigation of the thermal degradation of poly(methylvinylketone)." Canadian Journal of Chemistry 63, no. 1 (1985): 232–35. http://dx.doi.org/10.1139/v85-038.

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The structural changes occurring in poly(methylvinylketone) when exposed to high temperatures have been investigated by high-resolution 13C solid-state nmr. The degradation proceeds via the aldol condensation of pendant ketone groups to form a cyclic β-hydroxy ketone which is dehydrated to the cyclic α,β-unsaturated ketone. As the degradation continues there is the formation of polycyclic structures and aromatization of the sample.

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van Slagmaat, Christian A. M. R., Teresa Faber, Khi Chhay Chou, et al. "Chemoselective formation of cyclo-aliphatic and cyclo-olefinic 1,3-diols via pressure hydrogenation of potentially biobased platform molecules using Knölker-type catalysts." Dalton Transactions 50, no. 29 (2021): 10102–12. http://dx.doi.org/10.1039/d1dt01252e.

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Hemicellulose-derived five-membered cyclic ketones are strategic precursors for sustainable 1,3-diol building blocks, and bifunctional iron catalysts provide unprecedented chemoselectivity in hydrogenation toward aliphatic and olefinic structures.

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33

Menezes, José C. J. M. D. S. "Arylidene indanone scaffold: medicinal chemistry and structure–activity relationship view." RSC Advances 7, no. 15 (2017): 9357–72. http://dx.doi.org/10.1039/c6ra28613e.

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Koelle, U., Chr Weißschädel та U. Englert. "Complexation and aromatization of α,β-unsaturated cyclic ketones by Ru(H2O)62+ and (Bz)Ru(H2O)32+: molecular structure of (η6-Tosylate)(η5-hydroxycyclopentadienyl)Ru and of (η6-Tosylate)(η6-1,4-dihydroxy-2,3,5,6-tetramethylbenzene)Ru". Journal of Organometallic Chemistry 490, № 1-2 (1995): 101–9. http://dx.doi.org/10.1016/0022-328x(94)05206-q.

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35

Wilbuer, Jennifer, Gregor Schnakenburg, and Birgit Esser. "Syntheses, Structures and Optoelectronic Properties of Spiroconjugated Cyclic Ketones." European Journal of Organic Chemistry 2016, no. 14 (2016): 2404–12. http://dx.doi.org/10.1002/ejoc.201600235.

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36

Büschen, Thomas, Wibke Dietz, Uwe Klingebiel, Mathias Noltemeyer, and Yvonne Schwerdtfeger. "Synthese von Fluorsilylenolaten, Aminosilylenolaten, -ethern und Aldolkondensaten/Synthesis of Fluorosilylenolates, Aminosilylenolates, -ethers, and Aldol Condensates." Zeitschrift für Naturforschung B 62, no. 11 (2007): 1358–70. http://dx.doi.org/10.1515/znb-2007-1103.

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Depending on the reaction conditions, ketones react with n-BuLi, tert-BuLi or lithium diisopropylamide to give enolates or alcoholates. In the reaction of tert-butylmethylketone with n-BuLi followed by fluorosilanes, the fluorosilyl-enolates H2C=C(O-SiFRR′)CMe3 (1 - 4) and fluorosilylethers Me3C(CH3)(n-C4H9)C-O-SiFRR′ (5 - 8) [R,R′ = Me (1, 5); F, CMe3 (2, 6); F, C6H5 (3, 7); F, CHMe2 (4, 8)] are formed. Using tert-butylmethylketone, n-BuLi and (Me3C)2SiF2, isobutene and the fluorosilyl-enolate of acetaldehyde H2C=CH-O-SiF(CMe3)2 (9) are obtained. Diisopropylketone reacts with Me3CLi and fluor

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37

Dalloul, Hany M., Khaled El-nwairy, Ali Z. Shorafa, and Ahmed Abu Samaha. "SYNTHESIS AND BIOLOGICAL ACTIVITIES EVALUATION OF SOME NEW SPIRO 1,2,4-TRIAZOLE DERIVATIVES HAVING SULFONAMIDE MOIETY." SOUTHERN BRAZILIAN JOURNAL OF CHEMISTRY 23, no. 23 (2015): 49–59. http://dx.doi.org/10.48141/sbjchem.v23.n23.2015.50_revista2015.pdf.

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A series of new spiro 1,2,4-triazoles V-IXa-j were synthesized by the reaction of appropriate amidrazones IV with cyclic ketones in the presence of p-toluene sulfonic acid as a catalyst. The structures of the synthesized compounds have been confirmed by the elemental analysis and spectroscopic data (IR, 1H NMR, 13C NMR and MS). The microbial features of the synthesized compounds were studied using well-established methods from the literature.

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38

El Kharrat, Salem, Philippe Laurent, Laurent Boiteau, and Hubert Blancou. "Novel Synthesis of Substituted 2-Trifluoromethyl and 2-Perfluoroalkyl N-Arylpyridinium Compounds—Mechanistic Insights." Molecules 24, no. 12 (2019): 2328. http://dx.doi.org/10.3390/molecules24122328.

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We report a new one-pot synthesis of 2-trifluoromethylated/2-perfluoroalkylated N-aryl-substituted pyridiniums, 5,6,7,8-tetrahydroquinoliniums and 6,7,8,9-tetrahydro-5H-cyclohepta[b]-pyridinium compounds starting from an activated β-dicarbonyl analogue (here a perfluoro-alkylated gem-iodoacetoxy derivative), an aromatic amine and a (cyclic or acyclic) ketone. The key step of this multicomponent reaction, involves the formation of a 3-perfluoroalkyl-N,N’-diaryl-1,5-diazapentadiene intermediate, various examples of which were isolated and characterized for the first time, together with investiga

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Demirci, Fatih, Yoshiaki Noma, Neş’e Kırımer, and K. Hüsnü Can Başera. "Microbial Transformation of (−)-Carvone¥." Zeitschrift für Naturforschung C 59, no. 5-6 (2004): 389–92. http://dx.doi.org/10.1515/znc-2004-5-618.

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The cyclic monoterpene ketone (−)-carvone was metabolized by the plant pathogenic fungus Absidia glauca. After 4 days of incubation, the diol 10-hydroxy-(+)-neodihydrocarveol was formed. The absolute configuration and structure of the crystalline substance was identified by means of X-ray diffraction and by spectroscopic techniques (MS, IR and NMR). The antimicrobial activity of the substrate and metabolite was assayed with human pathogenic microorganisms.

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40

Munshi, Parthapratim, Edward H. Snell, Mark J. van der Woerd, et al. "Neutron structure of the cyclic glucose-bound xylose isomerase E186Q mutant." Acta Crystallographica Section D Biological Crystallography 70, no. 2 (2014): 414–20. http://dx.doi.org/10.1107/s1399004713029684.

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Ketol-isomerases catalyze the reversible isomerization between aldoses and ketoses. D-Xylose isomerase carries out the first reaction in the catabolism of D-xylose, but is also able to convert D-glucose to D-fructose. The first step of the reaction is an enzyme-catalyzed ring opening of the cyclic substrate. The active-site amino-acid acid/base pair involved in ring opening has long been investigated and several models have been proposed. Here, the structure of the xylose isomerase E186Q mutant with cyclic glucose bound at the active site, refined against joint X-ray and neutron diffraction da

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41

Cordero, Franca M., Carolina Vurchio, Stefano Cicchi, Armin de Meijere, and Alberto Brandi. "Rh-Catalyzed rearrangement of vinylcyclopropane to 1,3-diene units attached to N-heterocycles." Beilstein Journal of Organic Chemistry 7 (March 9, 2011): 298–303. http://dx.doi.org/10.3762/bjoc.7.39.

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Dienes embedded in quinolizidine and indolizidine structures can be prepared in four steps from cyclic nitrones and bicyclopropylidene. The key intermediates α-spirocyclopropanated N-heterocyclic ketones, generated via a domino 1,3-dipolar cycloaddition/thermal rearrangement sequence, were converted by Wittig methylenation to the corresponding vinylcyclopropanes (VCPs), which underwent rearrangement to 1,3-dienes in the presence of the Wilkinson Rh(I) complex under microwave heating. The previously unexplored Rh(I)-catalyzed opening of the VCP moiety embedded in an azapolycyclic system occurs

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42

Li, Ming, Rugang Xie, Shuanghe Tian, and Anmin Tian. "Quantum chemical study on enantioselective reduction of aromatic ketones catalyzed by chiral cyclic sulfur-containing oxazaborolidines. Part 2. Structures of catalyst-borane-ketone adducts." International Journal of Quantum Chemistry 78, no. 4 (2000): 252–60. http://dx.doi.org/10.1002/(sici)1097-461x(2000)78:4<252::aid-qua7>3.0.co;2-n.

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43

Van Vliet, M. Robert P., Gerard Van Koten, Paul Buysingh, Johann T. B. H. Jastrzebski, and Anthony L. Spek. "Reactivity of 1-aza-4-oxo-1,3-butadienes (.alpha.-imino ketones) toward diorganozinc reagents: regio- and chemoselective transfer of organo groups in the ZnR2/R1N:C(R2)C(R3):O system and x-ray structure of [cyclic] [EtZn(Et)(tert-Bu)NC(H):C(Me)O]2." Organometallics 6, no. 3 (1987): 537–46. http://dx.doi.org/10.1021/om00146a017.

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44

Labelle, Marc, та Denis Gravel. "Tautomeric equilibrium of cyclic β-ketoester enamines". Canadian Journal of Chemistry 63, № 7 (1985): 1884–90. http://dx.doi.org/10.1139/v85-312.

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The conjugated–unconjugated tautomerism of β-ketoester enamines has been investigated. Enamines with different amine ring size, ketone ring size, and ester alkyl group have been prepared. Equilibrium ratios of the conjugated and unconjugated forms have been determined. A three-point rationalization is presented: (1) the relative instability of the conjugated form is due to a large steric interaction; (2) the ring size combination largely determines the equilibrium ratio because of energy differences between the resonance hybrid structures of the conjugated forms; (3) the ester alkyl group slig

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45

Szmalko, David, Richard A. Evans, Jessirie Dilag, and Stuart Bateman. "Synthesis of Cyclic Oligomers of Polyether Ketone Ketone (PEKK) for Ring-Opening Polymerisation (ROP) Applications." Polymers 16, no. 24 (2024): 3465. https://doi.org/10.3390/polym16243465.

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Entropy-Driven Ring-Opening Polymerisation represents an attractive mechanism to produce high-performance polymeric materials as it can be performed using neat, low-viscosity precursors and without the production of by-products or release of volatiles. Macrocyclic oligomers (MCOs) of polyether ketone ketone (PEKK) were synthesised and investigated as an in situ method of forming this high-performance thermoplastic. Cyclic oligomers were successfully synthesised by pseudo-high dilution methods, and the reaction conditions were optimised through careful addition of starting materials and carbona

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46

Bilgin, Mehmet. "Isobaric vapour-liquid equilibrium calculations of binary systems using neural network." Journal of the Serbian Chemical Society 69, no. 8-9 (2004): 669–74. http://dx.doi.org/10.2298/jsc0409669b.

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A model on a feed forward back propagation neural network was employed to calculate the isobaric vapour?liquid equilibrium (VLE) data at 40, 66.67, and 101.32 ??0.02 kPa for the methylcyclohexane ? toluene and isopropanol ? methyl isobutyl ketone binary systems, which are composed of different chemical structures (cyclic, aromatic, alcohol and ketone) and do not show azeotrope behaviour. Half of the experimental VLE data only were assigned into the designed framework as training patterns in order to estimate the VLE data over the whole composition range at the mentioned pressures. The results

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47

Berkenwald, E., M. L. Laganá, P. Acuña, G. Morales, and D. Estenoz. "Bulk Polymerization of Styrene using Multifunctional Initiators in a Batch Reactor: A Comprehensive Mathematical Model." International Journal of Chemical Reactor Engineering 14, no. 1 (2016): 315–29. http://dx.doi.org/10.1515/ijcre-2015-0102.

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AbstractA detailed, comprehensive mathematical model for bulk polymerization of styrene using multifunctional initiators – both linear and cyclic – in a batch reactor was developed. The model is based on a kinetic mechanism that considers thermal initiation and chemical initiation by sequential decomposition of labile groups, propagation, transfer to monomer, termination by combination and re-initiation reactions due to undecomposed labile groups. The model predicts the evolution of global reaction variables (e.g, concentration of reagents, products, radical species and labile groups) as well

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48

Jin, Hui, Zhen-Qun Wu, Xiao-Hui Su, Lie-Jin Guo, and Xing-Xing Song. "Interfacial surface investigation of super-critical water gasification of corn cob." Thermal Science 20, suppl. 3 (2016): 895–901. http://dx.doi.org/10.2298/tsci16s3895j.

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Super-critical water gasification of biomass is a promising technology for hydrogen production. In order to achieve high hydrogen yield and complete gasification, the operating parameters were investigated and the solid residual was analyzed to study the reaction bottleneck by Fourier transform infrared spectroscopy and scanning electron microscopy. The experimental results showed that most organic functional groups in corn cob were consumed by super-critical water above 500?C, however, the aromatic substance and cyclic ketone were remained. The K2CO3 has the best catalytic effect due to the f

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49

Valente, E. J., J. F. Fuller, and J. D. Ball. "Pseudoacids. I. 4- and 5-Oxoacids." Acta Crystallographica Section B Structural Science 54, no. 2 (1998): 162–73. http://dx.doi.org/10.1107/s010876819701149x.

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Certain 4- and 5-oxoacids may exist in their cyclic lactol (or pseudoacid) forms. These commonly occur in compounds with proximate carboxylic acid and carbonyl (aldehyde or ketone) functions for the formation of five- or six-membered rings. Examples include trans-2,3-disubstituted aliphatic, (Z)-2,3-olefinic and o-disubstituted aromatic acids. Crystal structures of compounds in these categories are reported: trans-4-methyl-3-oxo-6-hydroxytetrahydropyran-3-carboxylic acid (6), monoclinic, C2/c, a = 25.412 (5), b = 6.291 (1), c = 10.757 (2) Å, β = 104.84 (3)°; penicillic acid (7), 4-methoxy-5-hy

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50

Racheva, N. L., Z. G. Aliev, and A. N. Maslivets. "Five-membered 2,3-dioxo heterocycles: LX. Reaction of 3-aroyl-1H-pyrrolo[2,1-c][1,4]benzoxazine-1,2,4-triones with cyclic enehydrazino ketones. Crystalline and molecular structure of N-[3′-benzoyl-4′-hydroxy-1′-(2-hydroxyphenyl)-6, 6-dimethyl-2,4,5′-trioxo-1′,4,5,5′,6,7-hexahydrospiro[indole-3,2′-pyrrol]-1(2H)-yl]-3-nitrobenzamide." Russian Journal of Organic Chemistry 44, no. 6 (2008): 836–39. http://dx.doi.org/10.1134/s1070428008060092.

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