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Relevant bibliographies by topics / Structure and Prototropy

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Journal articles
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Academic literature on the topic 'Structure and Prototropy'

Author: Grafiati

Published: 6 September 2023

Last updated: 31 July 2025

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Journal articles on the topic "Structure and Prototropy"

1

Cornejo, J., and M. C. Hermosin. "Structural alteration of sepiolite by dry grinding." Clay Minerals 23, no. 4 (1988): 391–98. http://dx.doi.org/10.1180/claymin.1988.023.4.06.

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AbstractThe effects of dry grinding on the structure of sepiolite were studied by XRD, surface area measurement, TG-DTA and IR spectroscopy techniques. The results show that the sepiolite framework is rather resistant to mechanical stress and its alteration by dry grinding occurs through three successive, overlapping processes: (i) thinning of the fibrous particles without structural alteration; (ii) distortion of the parallel units of sepiolite fibres, affecting essentially the particle surface which transforms into an amorphous protective coating; (iii) disruption of the inner structure and

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Sheshashena Reddy, T., N. Rameshwar, B. Bhudevi, and A. Ram Reddy. "Structure dependent prototropy in 4-hydroxy-3-formylideneamino-1-methyl/phenylquinolin-2-ones." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 73, no. 5 (2009): 916–21. http://dx.doi.org/10.1016/j.saa.2009.04.019.

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3

Grigg, Ronald, Jasothara Markandu, Trevor Perrior, Sivagnanasundram Surendrakumar, and William J. Warnock. "Effect of structure on tandem 1,2-prototropy-cycloaddition versus tandem cyclisation-cycloaddition reactions of oximes." Tetrahedron Letters 31, no. 4 (1990): 559–62. http://dx.doi.org/10.1016/0040-4039(90)87034-w.

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4

Colsch, Benoit, Annelaure Damont, Christophe Junot, François Fenaille, and Jean-Claude Tabet. "Experimental evidence that electrospray-produced sodiated lysophosphatidyl ester structures exist essentially as protonated salts." European Journal of Mass Spectrometry 25, no. 3 (2019): 333–38. http://dx.doi.org/10.1177/1469066719838924.

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Sodiated lysoglycerophosphatidylethanolamine (LGPE) and lysoglycerophosphatidylcholine (LGPC) species dissociate under low collision energy by covalent bond cleavage resulting in product ions with either sodium retention or without sodium retention. For explaining these fragmentations, sodium chelation by heteroatoms (as charge-solvated structures) is often considered, and consequently, under keV collision conditions, sodium is “spectator” of cleavages (charge remote fragmentation). However, cleavage of such charge-solvated forms under low-energy conditions should result in sodium desolvation

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Perrin, Monique, Alain Thozet, Pilar Cabildo, Rosa Ma Claramunt, Eduard Valenti, and José Elguero. "Molecular structure and tautomerism of 3,5-bis(4-methylpyrazol-1-yl)-4-methylpyrazole." Canadian Journal of Chemistry 71, no. 9 (1993): 1443–49. http://dx.doi.org/10.1139/v93-186.

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The title compound C12N6H14, 1, crystallizes in the space group P21/n (a = 8.222(2) Å, b = 27.336(8) Å, c = 5.574(2) Å, α = 90.00°, β = 100.97(4)°, γ = 90.00°), Z = 4, d = 1.308 g cm−3. The conformation about the N—C bonds linking the pyrazole rings can be defined as EZ, with "pyridine-like" nitrogen atoms in an anti disposition [Formula: see text] and "pyridine-like" and "pyrrole-like" nitrogen atoms in a syn disposition [Formula: see text] with regard to the central pyrazole. Intermolecular hydrogen bonds between the central and the terminal pyrazole ring of configuration Z form centrosymmet

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Star, Alexander, Israel Goldberg, and Benzion Fuchs. "Diazadioxadecalin and salen podands and macrocycles within dynamic combinatorial virtual libraries: structure, prototropy, complexation and enantioselective catalysis." Journal of Organometallic Chemistry 630, no. 1 (2001): 67–77. http://dx.doi.org/10.1016/s0022-328x(01)00882-8.

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Szymańska, Małgorzata, and Irena Majerz. "Prototropy, Intramolecular Interactions, Electron Delocalization, and Physicochemical Properties of 1,8-dihydroxy-9-anthrone—DFT-D3 Study of Substituent Effects." Molecules 28, no. 1 (2023): 344. http://dx.doi.org/10.3390/molecules28010344.

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1,8-dihydroxy-9-anthrone are tricyclic compounds with a ketone group in the middle ring and two hydroxyl groups substituted in the side-aromatic rings what results in formation of two intramolecular hydrogen bonds in which the oxygen atom from the ketone group is the proton acceptor. 1,8-dihydroxy-9-anthrones in which intramolecular proton transfer between C10 and CO in the middle ring occurs, can exist in a tautomeric keto-enol equilibrium. For anthralin, the most important representative of this group, this equilibrium has been studied previously, but it has not been studied for its derivati

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Raczyńska, Ewa Daniela. "On Some Origins of Tautomeric Preferences in Neutral Creatinine in Vacuo: Search for Analogies and Differences in Cyclic Azoles and Azines." Symmetry 16, no. 1 (2024): 98. http://dx.doi.org/10.3390/sym16010098.

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In order to look for the origins of tautomeric preferences in neutral creatinine in vacuo, we examined prototropic conversions for model azoles, namely mono-hydroxy and mono-amino imidazoles, and also for their selected 1-methyl derivatives. All possible isomeric forms of creatinine and model compounds, resulting from intramolecular proton transfer (prototropy), conformational isomerism about –OH, and configurational isomerism about =NH, were studied in the gas phase (model of non-polar environment) by means of quantum-chemical methods. Because the bond-length alternation is a consequence of t

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Elbrus Mammadov, Sevinj Guliyeva, Elbrus Mammadov, Sevinj Guliyeva. "UNUSUAL TRANSFORMATIONS OF 2,3- AND 1,3- BUTHANEDIOL MONOPROPARGYL ETHERS." PAHTEI-Procedings of Azerbaijan High Technical Educational Institutions 46, no. 11 (2024): 94–102. https://doi.org/10.36962/pahtei46112024-11.

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Research in the field of chemistry of oxygen-containing derivatives of acetylene has acquired considerable interest. Of the simple ethers containing a triple carbon-carbon bond, ethynyl and propargyl ethers of monohydric alcohols and phenols, as well as alkyl and aryl ethers of acetylene glycols have been studied in most detail. Alkynyl, especially propargyl mono- and diesters of polyhydric alcohols have not been studied extensively. Due to the presence of highly reactive centers, ethers occupy a special place in the field of chemistry of oxygen-containing derivatives of acetylenes. Acetylene

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Lacalli, T. C. "Prototroch structure and innervation in the trochophore larva of Phyllodoce (Polychaeta)." Canadian Journal of Zoology 64, no. 1 (1986): 176–84. http://dx.doi.org/10.1139/z86-028.

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The prototroch and prototroch nerve in trochophores of two Phyllodoce species are described at the ultrastructural level and interpreted with reference to the observed normal behavior of larvae during swimming. The prototroch is a complex structure consisting of four tiers of cells of which the second bears the main locomotory cilia. Cells in the other tiers also have cilia but are notable chiefly for the slender processes they send to the prototroch nerve and which evidently contribute to the sheath that surrounds the nerve. Neurociliary synapses were not observed, but the prototroch arrests

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Dissertations / Theses on the topic "Structure and Prototropy"

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Kheria, S. "Exploring non-covalent interactions in developing synthetic zipper structure and prototropy - free self -complementary quadrupal H-bonding arrays." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2017. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/3932.

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Book chapters on the topic "Structure and Prototropy"

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Aldoshin, S. M., and I. I. Chuev. "Crystal chemical design of prototropic systems with intra-and inter-molecular transfer of protons: results and prospects for practical application." In Correlations, transformations, and interactions in organic crystal chemistry. Oxford University PressOxford, 1994. http://dx.doi.org/10.1093/oso/9780198558262.003.0006.

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Abstract In recent years the study of crystal chemical aspects of solid phase transformations was one of the main topics of investigation for the Institute of Chemical Physics (Chernogolovka). Investigations of such reactions are preferred to those in the liquid phase because: a) the initial state of the system can be determined by X-rays; b) in suitable cases the crystal structure of the solid matrix stabilizes intermediates which can be studied by X-ray or spectroscopic methods; c) if a reaction does not occur on the macro-or micro-defects, correlation between the character of the reaction a

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