Relevant bibliographies by topics / Heterocyclic structures

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Heterocyclic structures'

Author: Grafiati
Published: 24 April 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Heterocyclic structures.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Heterocyclic structures"

1

Su, Biyun, Yifan Hou, Li Wang, Xiaoteng Li, Dandan Pan, Tingyu Yan, Ao Zhang, Faida Paison, and Liqing Ding. "The Syntheses, Characterization and Crystal Structures of a Series of Heterocyclic β-Diketones and Their Isoxazole Compounds." Current Organic Synthesis 16, no. 8 (January 20, 2020): 1174–84. http://dx.doi.org/10.2174/1570179416666191022113022.

Full text
Abstract:
Background: In the field of coordination chemistry, the introduction of heterocyclic substituents into the structure of β-diketone enables ligand to produce multiple coordination sites. The adoption of small steric oxime group into the structure of heterocyclic β-diketone by Schiff-base condensation will further increase coordination sites and facilitate the generation of polynuclear structures. Objective: A series of β-diketones (2a-2c) containing different heterocycles such as pyridine, thiophene and furan and their corresponding isoxazole compounds (3a-3c) were synthesized. Materials and Methods: The Claisen condensations were investigated in a solvent-free rheological phase system at room temperature to obtain heterocyclic β-diketones 2a-2c, which further reacted with hydroxylamine hydrochloride to obtain heterocyclic isoxazoles 3a-3c. All these compounds were well characterized by EA, IR, 1H NMR and X-ray crystal diffraction to confirm the structures. Synthetic mechanisms of compounds and the effects of different heterocycles on reactivity were discussed deeply. Result: 1H NMR indicated that these β-diketones do not exist as a total diketonic form but an equilibration between diketone and enol forms in CDCl3 solvent, in which the enol form accounts for 98.0% in 2a, 94.3% in 2b, 95.5% in 2c. While the crystal structures of 2a-2c showed that the reaction allows to isolate diketones in solid state. Crystal structures of 3a-3c showed that the neutral β-ketone oximes resonate and cyclize to form the target heterocyclic isoxazoles. Conclusion: SN1 nucleophilic substitution mechanism of Claisen ketoester condensation was proposed for the syntheses of 2a-2c, and SN1 single molecule nucleophilic substitution reaction mechanism was put forward for 3a-3c.
APA, Harvard, Vancouver, ISO, and other styles
2

Shekarkhand, Marzieh, Karim Zare, Majid Monajjemi, Elham Tazikeh-Lemeski, and Masoumeh Sayadian. "Computational study of heterocyclic anticancer compounds through nbo method." Nexo Revista Científica 35, no. 01 (April 6, 2022): 367–81. http://dx.doi.org/10.5377/nexo.v35i01.13982.

Full text
Abstract:
In the present study NBO method contain the HOMO and the LUMO energies are calculated for 10 different heterocycles anticancer drug using B3LYP/6-31G(d,p). Frontier molecular orbitals (HOMO and LUMO) and Molecular Electrostatic Potential map of the compound was produced by using the π stacking of structures and anticancer activity of molecules. The NBO analysis was suggested that the molecular system contains π- π interaction, strong conjugative interactions and the molecule become more polarized owing to the movement of π-electron cloud from donor to acceptor. NBO, HOMO and LUMO energies, were investigated and Anticancer activity of Aromatic Heterocyclic compounds was investigated by NBO study and result was compared with our previous study about NICS and S-NICS of these 10 anticancer drug. the HOMO/LUMO gap of the heterocycle anticancer drug is significantly different from each other. The NBO method is used in both symmetric and asymmetric molecules and provides accurate information on the aromatics of the compound, especially the heterocyclic rings. It also provides accurate information in protected areas. Molecule 8 has the highest amount of HOMO and therefore aromaticity among the studied compounds which confirms the result of molecular orbital examination.
APA, Harvard, Vancouver, ISO, and other styles
3

Randić, Milan, Sonja Nikolić, and Nenad Trinajstić. "Aromaticity in heterocyclic molecules containing divalent sulfur." Collection of Czechoslovak Chemical Communications 53, no. 9 (1988): 2023–54. http://dx.doi.org/10.1135/cccc19882023.

Full text
Abstract:
The conjugated circuits model is applied to heterocycles containing divalent sulfur. A novel parametrization is introduced for 4n + 2 and 4n conjugated circuits containing a single sulfur atom. The relative aromatic stabilities of a number of heterocyclic systems containing divalent sulfur are studied. Comparison is made whenever possible with earlier reported resonance energies of these compounds, obtained by using Huckel MO and SCF π-MO models, and appropriate reference structures. Special attention is given to positional isomers. An explanation of the differences amongst such isomers is given.
APA, Harvard, Vancouver, ISO, and other styles
4

Yu, Jie, Ya Zhou, Dian-Feng Chen, and Liu-Zhu Gong. "Organocatalytic asymmetric synthesis of chiral nitrogenous heterocycles and natural products." Pure and Applied Chemistry 86, no. 7 (July 22, 2014): 1217–26. http://dx.doi.org/10.1515/pac-2013-1208.

Full text
Abstract:
AbstractNitrogen-containing chiral heterocycles represent important structural elements with wide occurrence in natural and unnatural compounds exhibiting important biological activities. Herein, we describe our recent endeavors directed toward the Brønsted acid-catalyzed 1,3-dipolar cycloaddition and alkylation reactions, together with the metal/Brønsted acid relay catalytic cascade reactions to access some typical nitrogenous heterocyclic structures and natural alkaloids, including (+)-folicanthine and (+)-gliocladin C.
APA, Harvard, Vancouver, ISO, and other styles
5

Höltzl, Tibor, Vu Thi Ngan, Minh Tho Nguyen, and Tamás Veszprémi. "Resonance structures of N-heterocyclic carbenes." Chemical Physics Letters 481, no. 1-3 (October 2009): 54–57. http://dx.doi.org/10.1016/j.cplett.2009.09.060.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Drapak, І. V. "In silico screening of drug-like molecules for the treatment of cardiovascular diseases on the basis of five-membered privileged heterocycles." Farmatsevtychnyi zhurnal, no. 4 (September 10, 2019): 61–72. http://dx.doi.org/10.32352/0367-3057.4.19.07.

Full text
Abstract:
Among various heterocyclic systems, the derivatives of five-membered heterocycles are of special interest. Most of the above mentioned heterocycles are treatred as so-called privileged structures in modern medicinal chemistry. In silico screening among five-membered heterocycles of molecules for the treatment of cardiovascular diseases is actual. The aim of the work was the search for synthetic drug-like molecules based on functionalized five-membered heterocycles and related heterocyclic systems as an element of the theoretical platform for rational design of compounds acting on the cardiovascular system, and prediction of their possible mechanism of action. The objects of the study were derivatives of uncondensed and condensed five-membered heterocycles. In the work, in silico approaches were applied using the programs: Hyper-Chem, PASS, AutoDock, PROTOX. Based on the previous studies, focused sub-libraries of small synthetic drug-like molecules based on functionalized five-membered heterocycles and related heterocyclic systems have been selected. The compounds were divided on 12 groups. The optimization of the compound structures, the drug-like parameters calculation were carried out. The activity prediction, the acute toxicity level and docking studies to probable bio-targets which are related with cardiovascular drug mechanism of action have been carried out. It was shown that thiazole and thiadiazole based compounds possessed the highest calculated affinity levels to selected bio-targets. This is consistent with PASS-based prediction data. Diverse functionalized derivatives of five-membered heterocycles (thiazole, thiazolidine, thiadiazole, pyrazole, thiophene, triazole) and related fused heterocycles have been grouped in focused sub-libraries of compounds. it has been established that thiazole and thiadiazole based compounds are promising objects for directed synthesis and further modification as potential cardiovascular agents based on the prediction of biological activity, the calculation of affinity to potent bio-targets, and the prediction of the drug-like features and acute toxicity level. The prognostic values of the parameters of the above mentioned groups of compounds may be used as the element of theoretical platform for the search and de novo design of potential drugs for the treatment of cardiovascular diseases.
APA, Harvard, Vancouver, ISO, and other styles
7

Lai, Pui-Mun, and Sie-Tiong Ha. "Synthesis of Heterocyclic Pyridine-Based Chalcones with Dimeric Structure." Chemistry & Chemical Technology 16, no. 1 (February 20, 2022): 1–6. http://dx.doi.org/10.23939/chcht16.01.001.

Full text
Abstract:
Three new heterocyclic chalcones containing pyridine moiety were synthesized and their chemical structures were determined via IR, 1H NMR and 13C NMR spectroscopy. General name of these compounds are α,ω-bis{3-(pyridin-3-yl)-1-(phenyl-4-oxy)prop-2-en-1-one}alkanes. The chalcones are dimers having a symmetrical structure and they can be differed by the alkyl spacer length (CnH2n, where n = 8, 10 or 12). Differential scanning calorimetry (DSC) technique was employed to study their phase transition behaviors. DSC thermograms displayed direct isotropization and recrystallization during heating and cooling processes, respectively. The crystal phase turned into isotropic phase without exhibiting any mesophase. Influence of structure-liquid crystalline property relationships of the symmetrical dimers was examined in order to explain the reasons for the non-liquid crystalline properties in the current chalcones.
APA, Harvard, Vancouver, ISO, and other styles
8

Xu, Yuan, Li, and Li. "Recent Discovery of Heterocyclic Alkaloids from Marine-Derived Aspergillus Species." Marine Drugs 18, no. 1 (January 14, 2020): 54. http://dx.doi.org/10.3390/md18010054.

Full text
Abstract:
Nitrogen heterocycles have drawn considerable attention due to of their significant biological activities. The marine fungi residing in extreme environments are among the richest sources of these basic nitrogen-containing secondary metabolites. As one of the most well-known universal groups of filamentous fungi, marine-derived Aspergillus species produce a large number of structurally unique heterocyclic alkaloids. This review attempts to provide a comprehensive summary of the structural diversity and biological activities of heterocyclic alkaloids that are produced by marine-derived Aspergillus species. Herein, a total of 130 such structures that were reported from the beginning of 2014 through the end of 2018 are included, and 75 references are cited in this review, which will benefit future drug development and innovation.
APA, Harvard, Vancouver, ISO, and other styles
9

Lynch, Daniel E., and Glyn D. Jones. "Geometry of the 2-aminoheterocyclic–carboxylic acid R 2 2(8) graph set: implications for crystal engineering." Acta Crystallographica Section B Structural Science 60, no. 6 (November 11, 2004): 748–54. http://dx.doi.org/10.1107/s0108768104023791.

Full text
Abstract:
The geometry of the R_2^2(8) graph set formed between a 2-aminoheterocyclic ring containing an Nsp 2 atom (in the 1-position of the ring) and a carboxylic acid has been studied. Collating data from known co-crystal structures containing five- and six-membered heterocyclic rings from the Cambridge Structural Database revealed unexpected differences between two kinds of non-hydrogen contact distances, and between specific bond distances and angles of the heterocycle. Not only were the interatomic non-hydrogen distances between the N atoms (heterocycle) and O atoms (carboxylate) asymmetric, but also the 2-amino N atom (N21) to the heterocyclic C atom (C2) bond was shorter than the C2 to N1sp 2 bond. However, this shortening of the C2—N21 bond was not observed in the examples where N21 was substituted with a non-H atom. For the six-membered rings the data also showed that as the C2—N21 bond shortened the N1—C2—N21 bond angle increased.
APA, Harvard, Vancouver, ISO, and other styles
10

Harith M. Al-ajely. "Synthesis and pharmaceutical applications of Oxazine compounds derived from Pyronic, Salicylic, Antharanilic acids and Phenols." International Journal of Science and Research Archive 2, no. 2 (May 30, 2021): 074–86. http://dx.doi.org/10.30574/ijsra.2021.2.2.0250.

Full text
Abstract:
It is well known from FDA reports that More than 75% of the heterocyclic compounds are drugs and 90 of heterocyclic compounds are cancer drugs. The nitrogen-based heterocycles occupy an exclusive position as a valuable source of therapeutic agents in medicinal chemistry. Most drugs approved by the FDA and currently available in the market are nitrogen-containing heterocyclic moieties, More over heterocyclic compounds are important class of organic chemistry due to their widely spread in nature. Also there are many route for their action and many mechanistic pathways for their preparation and different metabolic actions. This comes from the easily building or removal of any functional group within the molecules. Changing just on group cause to change the metabolic pathway of the drug action and site of attack of the desired target accordingly. This great characteristic value make them much more important in drug discovery programs of many researchers and also encouraged us and drew attentions of other researchers to develop new ways for their synthesis. As a result different pharmacological and medical applications. Oxazie compounds are sub branch of heterocyclic compounds. These compounds having two hetero atoms, Oxygen and nitrogen within their structures make them much more important toward therapeutic studies. We are here in our investigation will focus on the methodologies and the therapeutic action of the titled compounds as well as other various applications.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Heterocyclic structures"

1

Brookman, Charles Alexander. "The molecular structures of some heterocyclic compounds." Thesis, University of Edinburgh, 1993. http://hdl.handle.net/1842/12791.

Full text
Abstract:
The gas-phase molecular structures of 2-chloropyridine, 3-chloropyridine, 4-chloropyridine, chloropyrazine, 1,2,3-triazine, 1,3,5-triazine and 1,2,4,5-tetrazine have been determined by electron differaction, and, in the case of the first two and the fourth, by combining them with microwave spectoscopy data. Of particular interest was the combination of ring distortion effects arising from both the chlorine substituent and the nitrogen heteratom. The results tend to indicate a more complicated system than that of purely substituent effects, an area already well documented. One of the interesting facts to emerge from this study is the possible breakdown of this superposition method of predicting distortions when the ring geometry is highly distorted from the hexagonal . When several heteroatoms are present in the ring, especially if they distort in a mutually constructive manner, such high distortions may result. Predictions are then unreliable for determining the extent to which each ring angle is affected. It was also found that the presence of the nitrogen enhances the power of the chlorine to distort the ring, adding further to the evidence that the distortions might not be merely additive.
APA, Harvard, Vancouver, ISO, and other styles
2

Somphol, Kittiya Chemistry Faculty of Science UNSW. "Synthesis of new heterocyclic structures based on indoles." Awarded by:University of New South Wales. Chemistry, 2007. http://handle.unsw.edu.au/1959.4/40829.

Full text
Abstract:
Novel indolo-macrocycles have been generated from the attempts to synthesise bis-indolo-cyclotriveratrylenes by the condensation of I, I'-diindolyl-3,3'-dimethanols catalysed by p-toluenesulfonic acid. The addition of substituents on indoles led to enhanced solubilities of the macrocycles. Nine- and six-membered ring compounds have been synthesized from the acid-catalysed reaction of I,I'-diindolyl compounds and aryl aldehydes. Some reactions of these compounds and the attempted synthesis of 2,2' diindolylmethanes from the cyclic compounds have also been described. The electrophilic substitution reactions of 3-substituted 4,6-dimethoxyindole 2,6-dimethanols and 3-substituted 4,6-dimethoxyindole-7 and 2-carbaldehydes and I-substituted indoles afforded triindolyl dialdehydes. The wriation of substituents at C-7 of indole-7-aldehydes and at C-2 of indole-2-aldehydes has also been discussed. Reaction of the hydroxymethylindole and 1,2-di(indol-I-ylmethyl)benzene gave a new macrocycle. Substitution reactions of 2,2???-diindolylmethane-7,7'-dimethanol and indole-7- and 2-aldehydes gave tetraindolyl dialdehydes. Sodium borohydride reduction of tri- and tetra-indolyl dialdehydes gave tri- and tetra-indolyl dimethanols respectively. Acid-catalysed reactions of tri- and tetra-indolyl dimethanols afforded only calix[3] and [4]indoles respectively when all substituents at C-3 of indoles were aryl groups. New conditions for indole based imine synthesis have been established Macrocyclic imine formation from mono-, di-, tri and tetra-indolyl dialdehydes has been investigated. Reactions of indole-3, 7-dialdehydes and short chain diamines (1,2-diaminoethane, 1,2-diaminobenzene and 1,6-diaminohexane) gave mixtures while the reactions with long chain diamines (1,10 diaminodecane and 1,12-diaminododecane) gave monoindolyl macrocyclic imines. Reaction of indole-2, 7-dialdehydes and short chain diamines afforded diindolyl macrocyclic imines with head-tail structures, and the 2,7';2',2";7",2'''-Tetraindole-7 ,7"'-dialdehyde underwent cyclisation with triindolyl dialdehydes and 1,6-diaminohexane afforded triindolyl macrocyclic imines. 1,2 diaminoethane while the 2,3 ';1',1 ";3 ",2"'-tetraindole-7,7"'-dialdehydes underwent imine, with its precise structure established by X-ray crystallography. Reaction of of 1,3-di(indol-l-ylmethyl)benzene and 1,2 diaminoethane yielded a new macrocyclic reactions with long chain diamines yielded monoindolyl macrocyclic imines. Reaction ring closure with 1,2 diaminoethane and 1,6-diaminohexane.
APA, Harvard, Vancouver, ISO, and other styles
3

Sprick, Reiner Sebastian. "Polytriarylamines containing fused ring and heterocyclic structures prepared using N-heterocyclic carbene complexes of palladium." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/polytriarylamines-containing-fused-ring-and-heterocyclic-structures-prepared-using-nheterocyclic-carbene-complexes-of-palladium(c09188eb-490b-452c-945a-22979f58c76d).html.

Full text
Abstract:
For the preparation of semiconducting polymers often ‘standard’ catalytic systems are used without further optimisation. New ligands, such as N-heterocyclic carbenes have shown excellent activity in cross-coupling reactions (e.g. Suzuki-Miyaura reaction, or Hartwig-Buchwald amination). These systems show excellent conversions under mild conditions and even allow the use of aryl chlorides as reagents. Nevertheless, previously no system has been reported for the synthesis of conjugated polymers, e.g. the Suzuki polycondensation or Buchwald-Hartwig type polycondensation using these catalysts. A NHC-Pd based catalytic system was optimised for a polyamination reaction and the catalyst [(IPr)Pd(allyl)Cl] was found to be the most active. Polytriarylamines were synthesised using the optimised catalytic system and tested in organic field-effect transistors. Mobilities found were low which was found to be attributed to the presence of high molecular weight fractions. Molecular weights were controlled using an in situ end-capping approach and polymers tested in the semiconducting layer of OFETs gave similar mobilities tothose reported earlier. Several polytriarylamines, which have not been reported previously, were synthesised using NHC-chemistry and the in situ end-cappingapproach, as well as polytriarylamines that have been reported previously using Pd/phosphine catalysts. One library containing polymers based on biphenyles andbridged biphenyles and another library containing polymers with bridged oligoarenes were synthesised. Suzuki polycondensation was also studied besides the polyamination protocol and low catalyst loadings and reaction temperatures could be realised using a NHC-Pd catalyst. Sulfur containing monomers that could not be polymerised using the polyamination were polymerised successfully. All polymers were fully characterised and studied as the active layer in organic field-effect transistors. The highest mobilities determined for these polymers (~10-2 cm2/Vs) is close to the highest reported for this class of polymer reported to date.
APA, Harvard, Vancouver, ISO, and other styles
4

Solinas, Gavino <1984&gt. "N-Heterocyclic carbene complexes of rhodium: structures, dynamics and catalysis." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5637/.

Full text
Abstract:
A series of imidazolium salts of the type [BocNHCH2CH2ImR]X (Boc = t-Bu carbamates; Im = imidazole) (R = Me, X = I, 1a; R = Bn, X = Br, 1b; R = Trityl, X = Cl, 1c) and [BnImR’]X (R’ = Me, X = Br, 1d; R’ = Bn, X = Br, 1e; R’ = Trityl, X = Cl, 1g; R’ = tBu, X = Br, 1h) bearing increasingly bulky substituents were synthetized and characterized. Subsequently, these precursors were employed in the synthesis of silver(I)-N-heterocyclic (NHC) complexes as transmetallating reagents for the preparation of rhodium(I) complexes [RhX(NBD)(NHC)] (NHC = 1-(2-NHBoc-ethyl)-3-R-imidazolin-2-ylidene; X = Cl; R = Me, 4a; R = Bn, 4b; R = Trityl, 4c; X = I, R = Me, 5a; NHC = 1-Bn-3-R’-imidazolin-2-ylidene; X = Cl; R’ = Me, 4d, R’ = Bn, 4e, R’ = Trityl, 4g; R’ = tBu, 4h). VT NMR studies of these complexes revealed a restricted rotation barriers about the metal-carbene bond. While the rotation barriers calculated for the complexes in which R = Me, Bn (4a,b,d,e and 5a) matched the experimental values, this was not true for the complexes 4c,g, bearing a trityl group for which the values are much smaller than the calculated ones. Energy barriers for 4c,g, derived from a line shape simulation, showed a strong dependence on the temperature while for 4h the rotational energy barrier is stopped at room temperature. The catalytic activity of the new rhodium compounds was investigated in the hydrosilylation of terminal alkynes and in the addition of phenylboronic acid to benzaldehyde. The imidazolium salts 1d,e were also employed in the synthesis of new iron(II)-NHC complexes. Finally, during a six-months stay at the University of York a new ligand derived from Norharman was prepared and employed in palladium-mediated cross-coupling.
APA, Harvard, Vancouver, ISO, and other styles
5

Zapf, Christoph W. "Novel guanidinylating reagents and heterocyclic structures for peptidomimetic drug design /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2003. http://wwwlib.umi.com/cr/ucsd/fullcit?p3091332.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Oughtred, R. E. "The crystal and molecular structures of some heterocyclic thioamides and related metal complexes." Thesis, University of Newcastle Upon Tyne, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370179.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Brucka, Marta Anna. "N-Heterocyclic carbene complexes of silver, rhodium and iron: structures, dynamics and catalysis." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/3873/.

Full text
Abstract:
The research performed in the framework of this Master Thesis has been directly inspired by the recent work of an organometallic research group led by Professor Maria Cristina Cassani on a topic related to the structures, dynamics and catalytic activity of N-heterocyclic carbene-amide rhodium(I) complexes1. A series of [BocNHCH2CH2ImR]X (R = Me, X = I, 1a’; R = Bz, X = Br, 1b’; R = trityl, X = Cl, 1c’) amide-functionalized imidazolium salts bearing increasingly bulky N-alkyl substituents were synthetized and characterized. Subsequently, these organic precursors were employed in the synthesis of silver(I) complexes as intermediate compounds on a way to rhodium(I) complexes [Rh(NBD)X(NHC)] (NHC = 1-(2-NHBoc-ethyl)-3-R-imidazolin-2-ylidene; X = Cl, R = Me (3a’), R = Bz (3b’), R = trityl (3c’); X = I, R = Me (4a’)). VT NMR studies of these complexes revealed a restricted rotation barriers about the metal-carbene bond. However, while the rotation barriers calculated for the complexes in which R = Me, Bz (3a’,b’ and 4a) matched the experimental values, this was not true in the trityl case 3c’, where the experimental value was very similar to that obtained for compound 3b’ and much smaller with respect to the calculated one. In addition, the energy barrier derived for 3c’ from line shape simulation showed a strong dependence on the temperature, while the barriers measured for 3a’,b’ did not show this effect. In view of these results and in order to establish the reasons for the previously found inconsistency between calculated and experimental thermodynamic data, the first objective of this master thesis was the preparation of a series of rhodium(I) complexes [Rh(NBD)X(NHC)] (NHC = 1-benzyl-3-R-imidazolin-2-ylidene; X = Cl, R = Me, Bz, trityl, tBu), containing the benzyl substituent as a chiral probe, followed by full characterization. The second objective of this work was to investigate the catalytic activity of the new rhodium compounds in the hydrosilylation of terminal alkynes for comparison purposes with the reported complexes. Another purpose of this work was to employ the prepared N-heterocyclic ligands in the synthesis of iron(II)-NHC complexes.
APA, Harvard, Vancouver, ISO, and other styles
8

Carvalho, Luísa da Conceição Costa Rainho de. "Development of novel benzimidazole- based COX Inhibitors new synthetic strategies and screening of heterocyclic structures." Doctoral thesis, Faculdade de Ciencias e Tecnologia, 2014. http://hdl.handle.net/10362/13142.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Resch, Stefan Günter. "Dinuclear Copper and Nickel Complexes of New Multidentate N-heterocyclic Carbene Ligands: Structures, Dynamics and Reactivity." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2018. http://hdl.handle.net/21.11130/00-1735-0000-0005-12D5-6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Resch, Stefan Günter [Verfasser]. "Dinuclear Copper and Nickel Complexes of New Multidentate N-heterocyclic Carbene Ligands: Structures, Dynamics and Reactivity / Stefan Günter Resch." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2019. http://d-nb.info/1224100247/34.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Heterocyclic structures"

1

Eicher, Theophil. The chemistry of heterocycles: Structure, reactions, syntheses, and applications. 2nd ed. Weinheim: Wiley-VCH, 2004.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Eicher, Theophil. The chemistry of heterocycles: Structure, reactions, syntheses, and applications. Stuttgart: G. Thieme, 1995.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

The chemistry of heterocycles: Structure, reactions, syntheses, and applications. 2nd ed. [Weinheim]: Wiley-VCH, 2003.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

De Proft, Frank, and Paul Geerlings, eds. Structure, Bonding and Reactivity of Heterocyclic Compounds. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-45149-2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Iriepa, Isabel. Structural analysis of cyclic systems, 2005. Kerala, India: Research Signpost, 2005.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Valentin, Lopyrev, ed. Nitroazoles: Synthesis, structure and applications. Dordrecht: Springer, $c c2009., 2009.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Symposium Pharmaco-Clinique Roussel Uclaf (19 1995 Paris, France). Peptidomimetics: Structural, biological and pharmacological results : Paris, 30 November and 1st December 1995. Romainville: Institut scientifique Roussel, 1995.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

service), SpringerLink (Online, ed. High- and Low-Valent tris-N-Heterocyclic Carbene Iron Complexes: A Study of Molecular and Electronic Structure. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

N, Dʹi͡a︡chkov P., ed. Heteroligand molecular systems: Bonding, shapes and isomer stabilities. London: Taylor & Francis, 2002.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Vellaichamy, Sutharchana Devi. Heterocycles as mediators in the transformation of organic structures. 1989.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Heterocyclic structures"

1

Šunjić, Vitomir, and Vesna Petrović Peroković. "Retrosynthetic Consideration of Heterocyclic Structures." In Organic Chemistry from Retrosynthesis to Asymmetric Synthesis, 155–71. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29926-6_7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Joule, J. A., K. Mills, and G. F. Smith. "Structures and main physical properties of aromatic heterocycles." In Heterocyclic Chemistry, 1–17. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4899-3222-8_1.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Sasaki, Shigeru. "Heterophenes Carrying Phosphorus Functional Groups as Key Structures." In Topics in Heterocyclic Chemistry, 1–22. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/7081_2009_3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Iyoda, Masahiko, Tohru Nishinaga, and Masayoshi Takase. "Supramolecular Structures and Nanoassemblies of Oligothiophenes and Tetrathiafulvalenes." In Topics in Heterocyclic Chemistry, 119–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/7081_2008_16.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Murphy, Luke J., Katherine N. Robertson, Jason D. Masuda, and Jason A. C. Clyburne. "NHC Complexes of Main Group Elements: Novel Structures, Reactivity, and Catalytic Behavior." In N-Heterocyclic Carbenes, 427–98. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2014. http://dx.doi.org/10.1002/9783527671229.ch15.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Mejlsøe, S. L., and A. Kakkar. "CHAPTER 7. N-Heterocyclic Dendrimers: Hyperbranched Frameworks Containing Triazole, Triazine, Porphyrin and Phthalocyanine Ring Structures." In Monographs in Supramolecular Chemistry, 183–229. Cambridge: Royal Society of Chemistry, 2020. http://dx.doi.org/10.1039/9781788012904-00183.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Rousseau, Gérard, and Sylvie Robin. "Four-Membered Heterocycles: Structure and Reactivity." In Modern Heterocyclic Chemistry, 163–268. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527637737.ch3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Murphree, S. Shaun. "Three-Membered Heterocycles. Structure and Reactivity." In Modern Heterocyclic Chemistry, 11–162. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527637737.ch2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Hazelard, Damien, Raphaël Hensienne, Jean-Bernard Behr, and Philippe Compain. "Spiro Iminosugars: Structural Diversity and Synthetic Strategies." In Topics in Heterocyclic Chemistry, 261–90. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/7081_2019_29.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Handy, Emma L., and Jason K. Sello. "Structure and Synthesis of Conformationally Constrained Molecules Containing Piperazic Acid." In Topics in Heterocyclic Chemistry, 97–124. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/7081_2015_185.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Heterocyclic structures"

1

Song, Yingdeng, Bintai Li, and Liying Xing. "Study on Structure and Properties of New Heterocyclic Aramid Fibers." In 2015 2nd International Conference on Machinery, Materials Engineering, Chemical Engineering and Biotechnology. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/mmeceb-15.2016.27.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Wolak, J., K. Pogorzelec-Glaser, P. M. Champion, and L. D. Ziegler. "New Proton Conductivity Material With The Heterocyclic Molecule: Structure and NIR-Raman Study." In XXII INTERNATIONAL CONFERENCE ON RAMAN SPECTROSCOPY. AIP, 2010. http://dx.doi.org/10.1063/1.3482617.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Żołnowska, Beata, Jarosław Sławiński, Aneta Pogorzelska, Krzysztof Szafrański, Anna Kawiak, Mariusz Belka, Tomasz Bączek, and Jarosław Chojnacki. "New 2-alkylthio-4-chlorobenzenesulfonamide derivatives bearing heterocyclic moieties – synthesis, structure and anticancer activity studies." In 4th International Electronic Conference on Medicinal Chemistry. Basel, Switzerland: MDPI, 2018. http://dx.doi.org/10.3390/ecmc-4-05587.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Cingolani, Andrea, Rita Mazzoni, Valerio Zanotti, Matteo Sanviti, Laura Mazzocchetti, Tiziana Benelli, and Loris Giorgini. "Bis-amino functionalized iron N-heterocyclic carbene as epoxy resins hardener and flame behaviour modifier." In THE 9TH INTERNATIONAL CONFERENCE ON STRUCTURAL ANALYSIS OF ADVANCED MATERIALS - ICSAAM 2019. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5140308.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Gonçalves, M. S. T., V. H. J. Frade, M. J. Sousa, and C. V. P. Moura. "Antimicrobial evaluation of benzo[a]phenoxazine heterocycles: structure–activity relationships." In The 10th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2006. http://dx.doi.org/10.3390/ecsoc-10-01428.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Esselman, Brian, Robert McMahon, R. Woods, John Stanton, Kaori Kobayashi, Laura Sowin, Samuel Kougias, et al. "PRECISE SEMI-EXPERIMENTAL EQUILIBRIUM STRUCTURES OF SULFUR-CONTAINING HETEROCYCLES: THIOPHENE (C4H4S) AND THIAZOLE (C3H3NS)." In 2020 International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2020. http://dx.doi.org/10.15278/isms.2020.wj08.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Ouici, H. B., O. Benali, and A. Guendouzi. "Corrosion inhibition of mild steel in acidic media using newly synthesized heterocyclic organic molecules: Correlation between inhibition efficiency and chemical structure." In 4TH INTERNATIONAL CONGRESS IN ADVANCES IN APPLIED PHYSICS AND MATERIALS SCIENCE (APMAS 2014). AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4914277.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Olkhovyk, Oksana, Stanislaw Pikus, and Mietek Jaroniec. "Tailoring interfacial properties of periodic mesoporous organosilicas by incorporation of spacious heterocyclic and thiol groups and its implication for structural changes." In Optics & Photonics 2005, edited by Clemens Burda and Randy J. Ellingson. SPIE, 2005. http://dx.doi.org/10.1117/12.616834.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Jung-Si Lee, K. Chang, Wen-Jwu Wang, and Gene-Miang Lee. "Preparatint, structural, and physical studies of TTM-TTF complexes with qnint, a quinone-type acceptor fused with sulfur-containing heterocycles." In International Conference on Science and Technology of Synthetic Metals. IEEE, 1994. http://dx.doi.org/10.1109/stsm.1994.835498.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Andrejević, Tina P., Darko P. Ašanin, Nada D. Savić, Nevena Lj Stevanović, Miloš I. Djuran, and Biljana Đ. Glišić. "DNA/BSA BINDING STUDY OF DINUCLEAR GOLD(III) COMPLEXES WITH AROMATIC NITROGEN-CONTAINING HETEROCYCLES AS BRIDGING LIGANDS." In 1st INTERNATIONAL Conference on Chemo and BioInformatics. Institute for Information Technologies, University of Kragujevac, 2021. http://dx.doi.org/10.46793/iccbi21.312a.

Full text
Abstract:
In recent decades, a special attention has been devoted to gold(III) complexes as potential antitumor agents due to their structural similarity to platinum(II) complexes. One of the possible mechanisms of the mode of antitumor activity of gold(III) complexes could include their interaction with DNA. However, the effectiveness of the therapeutic agents also depends on the degree of its binding to proteins present in the blood plasma, because, in this way, it is transported to the cell. Considering this, we investigated the interactions of three dinuclear gold(III) complexes of the general formula [{AuCl3}2(μ– L)], L = 4,4’-bipy (4,4’-bipyridine, Au1), bpe (1,2-bis(4-pyridyl)ethane, Au2) and dpe (1,2-bis(4- pyridyl)ethene, Au3) with calf thymus DNA (ct-DNA) and bovine serum albumin (BSA). The main aim of the study was to evaluate the binding affinities of gold(III) complexes Au1–3 towards these biomolecules for possible insights on their mode of biological activity. The values of binding constants (KA) of Au1–3 to ct-DNA are higher than those for BSA, indicating greater affinity of the complexes towards this nucleic acid. The partition coefficient (logP) value for Au1 is higher compared to the corresponding values for the other two complexes, what is in accordance with a higher cellular uptake efficiency of this complex.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Heterocyclic structures' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography