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Journal articles on the topic 'Keto-enolic'

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Published: 5 June 2025

Last updated: 1 August 2025

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1

Lamartine, Roger. "Solid State Keto-Enolic Tautomerization." Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals 211, no. 1 (1992): 423–30. http://dx.doi.org/10.1080/10587259208025843.

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2

Costantini, Roberto, Luciano Colazzo, Laura Batini, et al. "Keto–enol tautomerization drives the self-assembly of leucoquinizarin on Au(111)." Chemical Communications 56, no. 19 (2020): 2833–36. http://dx.doi.org/10.1039/c9cc09915h.

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3

Arkhipov, Sergey G., Peter S. Sherin, Alexey S. Kiryutin, Vladimir A. Lazarenko, and Christian Tantardini. "The role of S-bond in tenoxicam keto–enolic tautomerization." CrystEngComm 21, no. 36 (2019): 5392–401. http://dx.doi.org/10.1039/c9ce00874h.

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A non-covalent interaction between the sulphur atom of thiophenyl moiety and oxygen of the carbonyl group (S-bond) plays a crucial role in keto–enol tautomerization of tenoxicam leading to the crystallization of latter only in zwitterionic (ZWC) and not in β-keto–enolic (BKE) form.

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4

Rawat, M. S. M., Sudagar Mal, and Pramod Singh. "Photochromism in Anils - A Review." Open Chemistry Journal 2, no. 1 (2015): 7–19. http://dx.doi.org/10.2174/1874842201502010007.

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This review describes in brief the historical perspective of photochromism and photochromic behaviour of ‘Anils’. This phenomenon among ‘Anils’ is exhibited due to the tautomerism between enol and keto form via six membered hydrogen transfer between the phenolic hydrogen and imine nitrogen and show the phenomenon of solid-state photochromism and thermochromism and photochromism in rigid glassy solutions as well. Photochromic property in ‘Anils’ is a characteristic of the molecule, but their chromo behaviour is not only influenced by the crystal structure of anils but also by the substituents i

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5

Collins, David J., and Ian T. Crosby. "Enolic Ortho Esters. VIII Synthesis of (2S,3S)-2,3-Bis(methoxymethyl)-1,4,6-trioxaspiro[4.5]dec-7-ene." Australian Journal of Chemistry 51, no. 11 (1998): 1025. http://dx.doi.org/10.1071/c98085.

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Enolic ortho ester (2S,3S)-2,3-bis(methoxymethyl)-1,4,6-trioxaspiro[4.5]dec-7-ene (10b) was synthesized in 65% yield by cycloadditon of acrolein with the ketene acetal (4S,5S)-4,5-bis(methoxymethyl)-2-methylidene-1,3-dioxolan (7), derived by potassium t-butoxide treatment of (4S,5S)-4,5-bis(methoxy- methyl)-1,3-dioxolan (4). Lewis acid catalysed reaction (TiCl4, CH2Cl2, –78°) of the enolic ortho ester (10b) with the ketene silyl acetal 3-phenylmethyl-2-trimethylsilyloxy-4,5-dihydrofuran (15) afforded the formyl keto ester 3-[4′,5′-bis(methoxymethyl)-2′-(4′′-oxobutyl)-1′,3′-dioxolan-2′-yl]-3-ph

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6

Collins, DJ, LM Downes, and M. Kyriakou. "Enolic Ortho Esters. III. Preparation of a Keto Acetal by Hydride Reduction of an Enolic Ortho Ester." Australian Journal of Chemistry 42, no. 9 (1989): 1617. http://dx.doi.org/10.1071/ch9891617.

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Lithium aluminium hydride reduction of the enolic ortho ester 4′,4′-dimethyl-3,4,5,8-tetra-hydrospiro [2H-l-benzopyran-2,21-[1,3]dioxolan] (8) in the absence of solvent gave 6-[21-(4″,4″- dimethyl-1″,3″-dioxolan-2″-yl)ethyl]cyclohex-3-en-1-one (11) which was isomerized to the α'β-unsaturated keto acetal (10). Similarly, hydride reduction of the phenolic ortho ester 4′-methyl-3,4-dihydrospiro[2H-1-benzopyran-2,2′-[1,3]dioxolan] (12a) and the 4′,4′-dimethyl analogue (12b), afforded the corresponding phenolic acetals (14a) and (14b) respectively, in high yields.′

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7

Taguchi, Hiroyasu, Daijiro Yanagisawa, Shigehiro Morikawa, Koichi Hirao, Nobuaki Shirai, and Ikuo Tooyama. "Synthesis and Tautomerism of Curcumin Derivatives and Related Compounds." Australian Journal of Chemistry 68, no. 2 (2015): 224. http://dx.doi.org/10.1071/ch14464.

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1,7-Bis(4′-hydroxy-3′-trifluoromethoxyphenyl)-1,6-heptadiene-3,5-dione (2a), related to curcumin, and thirteen 4-substituted derivatives were prepared and their keto/enol ratio in DMSO[D6] was determined by 19F NMR because the enolic form of these related curcumins had been shown to bind to amyloid plaques in the Alzheimer brain. The parent compound and the 4-ethoxycarbonyl derivative were almost 100 % in the enolic form that contains a conjugated hepta-1,4,6-trien-3-on-5-ol backbone. Enolisation decreased to varying amounts in the derivatives that had 4-substituted alkyl groups. Attempts to p

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8

Arkhipov, Sergey G., Peter S. Sherin, Alexey S. Kiryutin, Vladimir A. Lazarenko, and Christian Tantardini. "The role of S-bond in tenoxicam keto–enolic tautomerization." Acta Crystallographica Section A Foundations and Advances 77, a2 (2021): C623—C624. http://dx.doi.org/10.1107/s0108767321090711.

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9

G., S. Sanyal, K. Nath P., and Ganguly R. "Studies on oxovanadium(IV) and dioxouranium(VI) complexes of Schiff bases derived from pyrazine-2-carboxylic acid hydrazine and pyrazine-2,3-dicarboxylic acid dihydrazide with salicylaldehyde." Journal of Indian Chemical Society Vol. 79, Jan 2002 (2002): 54–57. https://doi.org/10.5281/zenodo.5840234.

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Department of Chemistry, University of Kalyani, Kalyani-741 235, India <em>E-mail : </em>rakesh_ganguly@yahoo.com                           <em>Fax : </em>91-33-5828282 <em>Manuscript received 6 September 2000, revised 16 March 2001, accepted 12 May 2001</em> Oxovanadium(IV) and dioxouranium(VI) complexes of Schiff bases (L and L') derived respectively from pyrazine-2-carboxylic acid hydrazide and pyrazine-2,3-dicarboxylic acid dihydrazide with salicylaldehyde h

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10

Giacopello, Sergio, Mónica E. Deluca, and Alicia M. Seldes. "Synthesis and NMR Studies of Some Steroidal Isoxazoles." Zeitschrift für Naturforschung B 47, no. 6 (1992): 891–97. http://dx.doi.org/10.1515/znb-1992-0620.

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A short synthesis of 17α-pregna-2,4-dien-[2,3-d]isoxazol-17β-ol (1) is described using mild reaction conditions and with a high overall yield. The equilibrium between keto-enolic forms has been studied by 1H NMR methods. Complete assignments of all the resonances in the 1H and 13C NMR spectra of Danazol have been made using a variety of one and two-dimensional correlation methods. 13C NMR spectra of all the intermediate and related model compounds were also assigned.

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11

Anderson, John C., and A. Douglas Broadbent. "The influence of pH in the tautomerism of 9,10-anthracenediols and 1,3-diketones." Canadian Journal of Chemistry 64, no. 1 (1986): 127–32. http://dx.doi.org/10.1139/v86-022.

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Equations have been derived to describe how the ratio of the total concentration of all keto forms to that of all enolic forms (K′) varies with changing pH, for a tautomeric system in which the enol and ketone are polyprotic acids. The influence of pH on the tautomerism of 2-amino-9,10-anthracenediol, 2,9,10-anthracenetriol, 2,4-pentanedione, and 1-(3-pyridyl)-1,3-butanedione was examined. The equilibrium constants for all the acid–base equilibria involved were calculated from the dependence of K′ on pH.

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12

Mohammed, Sewara J., Akam K. Salih, Mohammad Amin M. Rashid, Khalid M. Omer, and Karzan A. Abdalkarim. "Synthesis, Spectroscopic Studies and Keto-Enol Tautomerism of Novel 1,3,4-Thiadiazole Derivative Containing 3-Mercaptobutan-2-one and Quinazolin-4-one Moieties." Molecules 25, no. 22 (2020): 5441. http://dx.doi.org/10.3390/molecules25225441.

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In this study, a novel 1,3,4-thiadiazole derivative containing 3-mercaptobutan-2-one and quinazolin-4-one moieties (Compound 3) is synthesized by the coupling of 2-amino-1,3,4-thiadiazole-5-(3-mercaptobutan-2-one) (Compound 1) with 2-Phenyl-4H-3,1-benzoxazin-4-one (Compound 2) in one molecule moiety. Compound 3 is found to exist as two types of intra-molecular hydrogen bonding with keto-enol tautomerism characters, which is further confirmed using FTIR, 1H-NMR, 13C-NMR, mass spectrometer, and UV-Visible spectra. The 1H-NMR and UV-Visible spectra of Compound 3 are investigated in different solv

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13

Shrestha, Sabita. "SYNTHESIS AND CHARACTERIZATION OF COBALT (III) COMPLEX OF SALICYLALDEHYDE BENZOYL HYDRAZONE." Journal of Institute of Science and Technology 22, no. 1 (2017): 132–36. http://dx.doi.org/10.3126/jist.v22i1.17764.

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Cobalt Complex of type [Co(Hsbh)2(NO3)(H2O)]. 3H2O was synthesized and characterized by different analytical procedures, molar conductance, infrared and electronic spectral studies. The complex was found to be 1:2 metal ligand ratio. Molar conductance measurement shows non electrolyte nature of complex. Dehydration studies indicate the presence of coordinated as well as lattice water molecules. Infrared spectral studies indicate that ligand undergo keto enol tautomerism and bond to the metal ion via enolic oxygen and NH2 group. The electronic spectrum shows octahedral geometry around central c

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14

Samijlenko, S. A., I. V. Kondratyuk, and D. M. Hovorun. "Interaction with carboxylate ion in anhydrous DMSO shifts keto-enolic prototropic equilibrium in nucleosides to enolic tautomeric form: 1H NMR spectroscopy data." Biopolymers and Cell 19, no. 3 (2003): 242–46. http://dx.doi.org/10.7124/bc.000656.

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15

Zarzyka, Iwona, Antonin Klásek, Karol Hęclik, Antonin Lyčka, Radek Bartošík, and Lucjan Dobrowolski. "New Mono- and Diesters with Imidazoquinolinone Ring- Synthesis, Structure Characterization, and Molecular Modeling." Molecules 25, no. 18 (2020): 4303. http://dx.doi.org/10.3390/molecules25184303.

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The objective of the studies was to synthesize and characterize new mono- and diesters with an imidazoquinolin-2-one ring with the use of 2,3-dihydro-2-thioxo-1H-imidazo[4 ,5-c]-quinolin-4(5H)-ones and ethyl bromoacetate. The products were isolated at high yield and characterized by instrumental methods (IR, 1H-, 13C-, and 15N- NMR, MS-ESI, HR-MS, EA). In order to clarify the places of substitution and the structure of the derivatives obtained, molecular modeling of substrates and products was performed. Consideration of the possible tautomeric structures of the substrates confirmed the existe

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16

Enumo, Adalberto, Christhian Irineu Dias Pereira, and Alexandre Luis Parize. "Temperature Evaluation of Curcumin Keto–Enolic Kinetics and Its Interaction with Two Pluronic Copolymers." Journal of Physical Chemistry B 123, no. 26 (2019): 5641–50. http://dx.doi.org/10.1021/acs.jpcb.9b04150.

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17

Collins, DJ, AG Jhingran та SB Rutschmann. "Enolic Ortho Esters. IV. Synthesis of the 8-α and 8-β Epimers of a 6-Oxa Steroidal Enolic Ortho Ester". Australian Journal of Chemistry 42, № 10 (1989): 1769. http://dx.doi.org/10.1071/ch9891769.

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Reaction of resorcinol (9) with methyl 1β-hydroxy-7aβ-methyl-5-oxo-2,3,3 a α,4,5,6,7,7a- octahydro-1H-indene-4α-carboxylate (10a) or with the corresponding 1,5-dioxo ester (15) in methanesulfonic acid gave ( �)-3,17 β-dihydroxy-6-oxaestra-l,3,5(10),8(9)-tetraen-7-one (11a) (98%), or (c)-3-hydroxy-6-oxaestra-1,3,5(10),8(9)-tetraene-7,17-dione (14) (91%), respectively. 3-O-Methylation of the phenolic keto lactone (14) followed by reaction with ethylene glycol gave (�)-17,17-ethylenedioxy-3-methoxy-6-oxaestra-1,3,5(10),8(9)- tetrae n-7-one (16). Reduction of this with lithium/ammonia afforded 77%

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18

Rani, Rekha, Umesh Kumar, Deepak Kumar, Siteshwar Pd Yadav, Arjun Kr Sinha та S. Sharma. "Spectroscopic, Thermal and Antimicrobial Study of Some Transition Metal(II) Complexes of β-Diketones". Asian Journal of Chemistry 32, № 12 (2020): 3173–78. http://dx.doi.org/10.14233/ajchem.2020.22911.

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A novel heterocyclic based β-diketone has been synthesized by the condensation of pyrazole-1-acetylchloride and sodium acetophenone. The product 1-phenyl-4-(pyrazole-1-yl)butane- 1,3-dione has been used for complexation with Mn(II), Fe(II) and Co(II) metal ions. The ligand β-diketone is found to exist in keto-enol tautomeric forms. The comparision of infrared spectra of complexes clearly indicates the coordination of the ligand from its enolic form. The magnetic moment and electronic spectra of all the metal complexes leads to the distorted octahedral symmetry around the metal ion. The ligand

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19

Roy, Olivier, Abdelkhalek Riahi, Françoise Hénin та Jacques Muzart. "Catalysed Asymmetric Protonation of Simple Linear Keto-Enolic Species − A Route to Chiral α-Arylpropionic Acids". European Journal of Organic Chemistry 2002, № 23 (2002): 3986–94. http://dx.doi.org/10.1002/1099-0690(200212)2002:23<3986::aid-ejoc3986>3.0.co;2-l.

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20

Holzgrabe, Ulrike, Willy Friedrichsen, and Karl-F. Hesse. "Keto-Enol-Tautomerism and Configurational Isomerism of 2,6-Disubstituted 4-Piperidone-3,5-dicarboxylates." Zeitschrift für Naturforschung B 46, no. 9 (1991): 1237–50. http://dx.doi.org/10.1515/znb-1991-0918.

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The dialkyl 2,6-dialkylsubstituted 4-piperidone-3,5-dicarboxylates were synthesized by a Mannich procedure. Depending on the substitution at the nitrogen keto-enol-tautomerism and a configurational isomerism at C 2 is observed. The structure of the N-substituted piperidone 24 E (C18H29NO5) has been determined by X-ray analysis: it is characterized by an enol structure of the β-ketoester and an axial position of the alkyl group at C 2 and an equatorial one of the alkyl group at C 6. The O–H···O hydrogen bond shows characteristic values of a strong hydrogen bond. The N-unsubstituted piperidones

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21

N., D. SHARMA, KUMAR SANTOSH, V. BAKORE P., and C. JOSHI B. "Condensation of 2-Anilino-4-methylquinoline Derivatives with Substituted-diethylmalonate and Studies of Isomerism through Nmr Spectra." Journal of Indian Chemical Society Vol. 64, Aug 1987 (1987): 481–82. https://doi.org/10.5281/zenodo.6199354.

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Department of Chemistry, University of Rajasthan, Jaipur-302 004 <em>Manuscript received 6 February 1979, accepted 22 January 1987</em> 2 [<em>N</em>-(2,2-Dicarbethoxyvinyl)anilino]-4-methyl-quinoline (6), 2-[<em>N</em>-(2,2-dicarbethoxyvinyl)-2-chloroanilino]-4-methylquinoline (7) and 2-N-(2,2-dicarbethoxyvinyl)-4- methylquinoline (8) were prepared by condensing ethoxymethylene diethyl malonate (4) with 2-anilino-4-methyl-quinoline (1), 2-(2-chlorosailino)-4-methylquinoline (2) and 2.(4-methoxyanilino)-4-methyl quinoline (3), respectively. 2-[<em>N</em>-(2-Carbethoxy-2- pbenacetyl)anilin

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22

Cerchiaro, Giselle, Patrícia Lopes Saboya, Ana Maria da Costa Ferreira, Daniela Maria Tomazela, and Marcos Nogueira Eberlin. "Keto-Enolic Equilibria of an Isatin-Schiff Base Copper(II) Complex and its Reactivity toward Carbohydrate Oxidation." Transition Metal Chemistry 29, no. 5 (2004): 495–504. http://dx.doi.org/10.1023/b:tmch.0000037515.77851.12.

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23

Mari, Matteo, Debora Carrozza, Gianluca Malavasi та ін. "Curcumin-Based β-Diketo Ligands for Ga3+: Thermodynamic Investigation of Potential Metal-Based Drugs". Pharmaceuticals 15, № 7 (2022): 854. http://dx.doi.org/10.3390/ph15070854.

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Curcumin is known for its therapeutic properties; among these, antioxidant, anti-inflammatory and anti-cancer ones stand out. Besides, curcumin metal complexes have shown widespread application in medicine and can be exploited as lead structures for developing metal-based drugs. Unfortunately, curcumin is poorly bioavailable, mainly due to its instability in physiological conditions; this weakness is tightly connected to the presence of the β-diketo moiety undergoing tautomeric equilibrium. Stability and metal-chelating ability can be tuned by modulating the electronic effects and steric hindr

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24

(Mrs), PAPIA CHATTERJEE, HARJIT KAUR DUGGAL (Miss), V. AGARWALA B., and K. DEY ARUN. "Bipositive Metal Complexes of Novel Schiff Bases derived from Carbazides and 2-Aminopyridine." Journal Of India Chemical Society Vol.66, Aug-Oct 1989 (1989): 550–57. https://doi.org/10.5281/zenodo.5995418.

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Chemical Laboratories, University of Allahabad, Allahabad-211 002 Six Schiff base chelating ligands, viz. vanillin semicarbazone (VSC), 2-furaldehyde semicarbazone (FSC), vanillin thiosemicarbazone (VTSC), 2-furaldehyde thiosemicarbozone (FTSC). salicylaldehyde-2-aminopyridine (SAP) and 2-hydroxy-1- naphthaldehyde-2-aminopyridine (HNAP) and their complexes largely with bipositive cations are synthesised. The first four ligands exist in keto form but form complexes through deprotonated enolic form and the azomethine nitrogen to yield six-coordinated complexes with 2 moles of water are

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25

Jalali, Elahe, and Davood Nori-Shargh. "Symmetry breaking in the axial symmetrical configurations of enolic propanedial, propanedithial, and propanediselenal: pseudo Jahn–Teller effect versus the resonance-assisted hydrogen bond theory." Canadian Journal of Chemistry 93, no. 6 (2015): 673–84. http://dx.doi.org/10.1139/cjc-2015-0071.

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The origin of the symmetry breaking in the axial symmetrical configurations of enolic propanedial (1), propanedithial (2), and propanediselenal (3) have been investigated by means of time-dependence density functional theory and natural bond orbital interpretations. The results obtained at the quantum chemistry composite (G2MP2, CBS-QB3), ab initio molecular orbital (MP2/6-311++G**), and hybrid density functional theory (B3LYP/6-311++G**) levels of theory showed that the hydrogen-centered synchronous axial symmetrical (C2v) configurations of compounds 1–3 possessing the maximum π-electron delo

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26

Martí-Aluja, Idoia, Itziar Ruisánchez, Virginia Cádiz, Santiago Maspoch, and Maria Soledad Larrechi. "Aza-Michael reaction with enone-modified vegetable oils: evidence of the keto–enolic equilibrium by NIR chemical imaging and evolving factor analysis." Analytical and Bioanalytical Chemistry 399, no. 6 (2010): 1975–82. http://dx.doi.org/10.1007/s00216-010-4228-0.

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27

Karwowski, Boleslaw T. "The Electronic Properties of Cordycepin in the Adenine Nucleoside Landscape: A Theoretical Approach." Molecules 30, no. 11 (2025): 2289. https://doi.org/10.3390/molecules30112289.

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The anticancer activity of 3′-deoxyadenosine (Cordycepin, or dCor) is known to be linked to the inhibition of the MAPK/ERK signalling and Hedgehog pathways, as well as the termination of primer elongation by primase in DNA lagging-strand synthesis. In this study, the electronic properties of dCor, 7,8-dihydro-8-oxo-3′-deoxyadenosine (OXOdCor), and 8-hydroxy-3′deoxyadenosie (HOdCor), together with their spin densities, charge distributions, and global reactive descriptors, have been taken into consideration at the M06-2x/6-31++G** level of theory in the aqueous phase. It was found that dCor pre

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28

Amako, Ngozi Francesca, Mary-Ann Nkoli Mgbemena, and Sunday Peter Odo. "GC-MS profile and antimicrobial activities of extracts from root of Senna occidentalis Linn." Ovidius University Annals of Chemistry 34, no. 2 (2023): 63–71. http://dx.doi.org/10.2478/auoc-2023-0009.

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Abstract We considered the extraction of plant materials from Senna occidentalis root, and its fractionation monitored by bioassay towards isolating its bioactive principles. Pulverized root sample of Senna occidentalis (fam. leguminaceae) was extracted with methanol using a maceration method. The crude methanol extract (MSo) 6.06 g was partitioned into petroleum ether and ethyl acetate to yield their respective fractions viz: petroleum ether fraction (1.20 g), ethyl acetate fraction (1.86 g) and methanol fraction (2.92 g). The crude methanol extract was analyzed using phytochemical screening,

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29

Collins, DJ, and SB Rutschmann. "Enolic Ortho Esters. II. Tandem Nucleophilic Electrophilic Dimethylation of 4',4'-Dimethyl-3,4,5,8-tetrahydrospiro[2H-1-Benzopyran-2,2'-[1,3]dioxolan]." Australian Journal of Chemistry 42, no. 9 (1989): 1447. http://dx.doi.org/10.1071/ch9891447.

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Reaction of 4′,4′-dimethyl-3,4,5,8-tetrahydrospiro[2H-1-benzopyran-2,2′-[l,3]dioxolan](9) with methylmagnesium iodide in benzene or toluene at 40� gave the iodomagnesium enolate acetal (10) which upon in situ reaction with methyl iodide afforded 56% of pure 6 ξ-methyl- 6-[2′-(2″,4″,4″-trimethyl-1″,3″-dioxolan 2″yl)ethyl]cyclohex-3-en-one (11), the product of tandem nucleophilic/electrophilic dimethylation . Aqueous ammonium chloride workup of the iodomagnesium enolate (10) gave 6-[2′-(2″,4″,4″-trimethyl-1″,3″-dioxolan 2″yl)ethyl] cyclohex-3-en-1-one (7). Some further transformations of the met

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30

Liu, Xue‐yan, Wei Jia, Cui‐mei Liu, and Zhen‐dong Hua. "An NMR study on the keto‐enol tautomerism of 1,3‐dicarbonyl drug precursors." Drug Testing and Analysis, August 17, 2024. http://dx.doi.org/10.1002/dta.3789.

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AbstractThe effective implementation of drug precursor legislation has driven the innovation and design of new alternative substances. The application of 1,3‐dicarbonyl precursors as alternative precursors for the synthesis of 1‐phenyl‐2‐propanone (P2P) and 3,4‐methylenedioxyphenyl‐2‐propanone (MDP2P) has created new challenges to legal control. Their 1,3‐dicarbonyl structure allows the precursors to exist as an equilibrium mixture of the tautomeric diketo and keto‐enolic forms during the nuclear magnetic resonance (NMR) analysis. In this study, the keto‐enol tautomerism of four 1,3‐dicarbonyl

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31

COLLINS, D. J., L. M. DOWNES, and M. KYRIAKOU. "ChemInform Abstract: Enolic Ortho Esters. Part 3. Preparation of a Keto Acetal by Hydride Reduction of an Enolic Ortho Ester." ChemInform 21, no. 1 (1990). http://dx.doi.org/10.1002/chin.199001176.

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32

Goyal, Rupendra, Suman Jain, and D. D. Agarwal. "Synthesis, characterization and antimicrobial study of novel substituted Curcumin Derivatives." Research Journal of Pharmacy and Technology, July 29, 2022, 3091–95. http://dx.doi.org/10.52711/0974-360x.2022.00517.

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Chemically, curcumin is a diaryl heptanoid, belonging to the group of curcuminoids, which are natural phenols responsible for turmeric's yellow color. It is a Keto–enol tautomer, existing in enolic form in organic solvents and in keto form in water. The one pot three component of hydrazide substituted benzaldehyde was used for the synthesis of curcumin derivatives. In this work the synthesis of curcumin derivatives was done using an environmental friendly procedure via Mg-Al-CO3 hydrotalcites which have been used as efficient catalysts. These catalysts are inexpensive and non-toxic powders. Da

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33

Surbhi, Rathore, Mukim Mohammad, and Sharma Pratishtha. "Curcumin: A Review for Health Benefits." January 31, 2020. https://doi.org/10.5281/zenodo.3925377.

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Curcuma longa (Turmeric) is a popular and widely used Indian rhizomatous medicinal plant from the family Zingiberaceae. Curcumin, Demethoxycurcumin (DMC), and Bisdemethoxycurcumin (BDMC) are the constituents of the turmeric and are collectively known as curcuminoids. Curcumin (1,7-bis(4-hydroxy-3-methoxyphenyl)-1,6-heptadiene-3,5-dione) or Diferuloylmethane is well-known for its different biological activities such as Anti-inflammatory, Anti-viral, Anti-oxidant, Anti-cancer, Anti-bacterial, Anti-asthmatic, Anti-arthritis, Anti-diabetic, Anti-venom, Anti-obesity, Wound-healing, in depression an

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34

Roy, Olivier, Abdelkhalek Riahi, Francoise Henin та Jacques Muzart. "Catalyzed Asymmetric Protonation of Simple Linear Keto-Enolic Species — A Route to Chiral α-Arylpropionic Acids." ChemInform 34, № 14 (2003). http://dx.doi.org/10.1002/chin.200314034.

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Jawale, Dhanaji V., Devendra Wagare, Dinesh L. Lingampalle, and Prashant D. Netankar. "Synthesis of 3-methyl-4H-benzo[b][1,4]thiazine-2-carboxylates using CAN as a catalyst and its conversion into guanidines." Current Organocatalysis 07 (December 28, 2020). http://dx.doi.org/10.2174/2213337207999201228141906.

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Abstract:

Background: 1,4-benzothiazine carboxylates show wide application in the field of medicinal chemistry. Therefore, we have designed convenient and efficient method for the synthesis of 1,4-benzothiazine carboxylates. Objective: Synthesis of 1,4-benzothiazine carboxylates and its guanidines by simple and facile method using efficient catalyst. Method: Derivatives of 1,4-benzothiazine carboxylates were synthesized by cyclocondensing β-keto esters with 2- aminobenzenethiols using CAN as a catalyst at room temperature. 1,4-benzothiazine caboxylate,condensed with guanidine hydrochloride in the presen

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Raut, Vaibhav. "Medicinal Chemistry of Curcumin and its Therapeutic Approaches from Ancient Medicine to Recent Potential." Open Access Journal of Pharmaceutical Research 5, no. 3 (2021). http://dx.doi.org/10.23880/oajpr-16000244.

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Abstract:

Many natural medicinal plants have been utilised to cure a range of disorders since ancient times and are regarded as a possible source of phytochemicals for the creation of new medications. One of these is curcumin, a bioactive molecule that is easily available, affordable, and harmless. It is a vital, naturally occurring, highly lipophilic and phenolic chemical. Curcumin (diferuloylmethane), a low-molecular-weight chemical derived from the roots of Curcuma longa L. (family Zingiberaceae), is mostly used as a curry spice, flavouring agent, insect repellant, food colouring agent, traditional m

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Yan, Dongbo, Lili Song, Fangyuan Kang, et al. "In Situ Growth of Covalent Organic Frameworks on Carbon Nanotubes for High‐Performance Potassium‐Ion Batteries." Angewandte Chemie, December 28, 2024. https://doi.org/10.1002/ange.202422851.

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Redox‐active covalent organic frameworks (COFs) have been demonstrated as promising organic electrodes in many electrochemical devices. However, their inherently low conductivity significantly hinders the full utilization of their internal redox‐active sites. To address this issue, a simple solvothermal method is used to in situ polymerize 2,4,6‐triformylphloroglucinol (TP) and p‐phenylenediamine (PA) on the surface of carbon nanotubes (CNTs), generating a nanocable‐like COF‐based nanocomposite, TpPa‐COF@CNT nanocables, which contain abundant β‐ketoenamine groups. By combining the high specifi

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Yan, Dongbo, Lili Song, Fangyuan Kang, et al. "In Situ Growth of Covalent Organic Frameworks on Carbon Nanotubes for High‐Performance Potassium‐Ion Batteries." Angewandte Chemie International Edition, December 28, 2024. https://doi.org/10.1002/anie.202422851.

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Abstract:

Redox‐active covalent organic frameworks (COFs) have been demonstrated as promising organic electrodes in many electrochemical devices. However, their inherently low conductivity significantly hinders the full utilization of their internal redox‐active sites. To address this issue, a simple solvothermal method is used to in situ polymerize 2,4,6‐triformylphloroglucinol (TP) and p‐phenylenediamine (PA) on the surface of carbon nanotubes (CNTs), generating a nanocable‐like COF‐based nanocomposite, TpPa‐COF@CNT nanocables, which contain abundant β‐ketoenamine groups. By combining the high specifi

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Bonomo, Isabelle, Giulia Assoni, Valeria La Pietra, et al. "HuR modulation with tanshinone mimics impairs LPS response in murine macrophages." Disease Models & Mechanisms, March 13, 2023. http://dx.doi.org/10.1242/dmm.050120.

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Lipopolysaccharide exposure to macrophages induces an inflammatory response that is heavily regulated at the transcriptional and post-transcriptional levels. HuR (ELAVL1) is an RNA binding protein that binds and regulates the maturation and half-life of AU/U rich elements (ARE) containing cytokines and chemokines transcripts, mediating the LPS-induced response. Here we investigated how and to what extent small molecule tanshinone mimics (TMs) inhibiting HuR-RNA interaction counteract LPS stimulus in macrophages. We show TMs exist in solution in keto-enolic tautomerism and that, by molecular dy

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