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Tautomer

About: Tautomer is a research topic. Over the lifetime, 10344 publications have been published within this topic receiving 165612 citations. The topic is also known as: tautomers.


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01 Jan 2003
TL;DR: In this article, the authors proposed a photochromism based on pericyclic reactions and cycloaddition reactions involving 4n+2 electrons for the purpose of energy storage.
Abstract: Photophysical, Photochemical and Photokinetic Properties of Photochromic Systems, G. Gauglitz. Photochromism Based on "E-Z" Isomerization of Double Bonds: CIS-trans isomerization of C=C double bonds, J. Saltiel, Y.-P. Sun Azo compounds, H. Rau. Photochromism Based on Pericyclic Reactions: Electrocyclization Reactions: 4n systems based on l,3-electrocyclization, C. Schulz, H. Durr 4n+2 systems based on 1,5-electrocyclization, H. Durr 4n+2 systems - molecules derived from Z-Hexa-1,3,5-Triene/ Cyclohexa- 1,3-Diene, W.H. Laarhoven 4n+2 systems - spiropyrans, R. Guglielmetti 4n+2 systems - fulgides, J. Whittal 4n+2 systems - spirooxazines, N.Y.C. Chu 4n and 4n+2 systems (n>2) based on 1,7- and l,10-electrocyclization, H. Durr. Photochromism Based on Pericyclic Reactions - Cycloaddition Reactions: Cycloaddition reactions involving 4n electrons - (2+2) cycloaddition - photochemical energy storage systems based on reversible valence photoi somerization, G. Jones II Cycloaddition reactions involving 4n electrons - (2+2) cycloaddition - molecules with multiple bonds ingorporated in or linked 10 aromatic systems, J-P. Desvergne, H. Bouas-Laurent Cycloaddition reactions involving 4n electrons - (4+4) cycloaddition reactions between unsaturated conjugated systems, H. Bouas-Laurent, J-P. Desvergne Cycloaddition reactions involving 4n+2 electrons - photochromism based on the reversible reagtion of singlet oxygen with aromatic compounds, H.-D. Brauer, R. Schmidt. Photochromism Based on Tautomerism (Hydrogen Transfer): Tautomerism by hydrogen transfer in salicylates, triazoles and oxazoles, H.E.A. Kramer Tautomerism by hydrogen transfer in anils, aci-nitro and related compounds, E. Hadjoudis. Photochromism Based of Dissociation Processes: Photochromism based on dissociation processes, R. Aldag. Photochromism in Biological Systems: Phytochrome, S.E. Braslavsky Retinal proteins, F. Siebert. Environmental Effects on Organic Photochromic Systems, V.A. Krongauz. The Use of Silver Salts for Photochromic Glasses: The use of silver salts for photochromic glasses, H.J. Hoffmann Applications Spiropyrans and related compounds, R. Guglielmetti Spirooxazines, N.Y.C. Chu Actinometry, G. Gauglitz Photochromic materials and photoresists, K. Ichimura. New Developments Highly Promising for Applications: Photochromism by orientation, J. Michl S Pectral hole - burning, U.P. Wild, A. Renn Bacteriorhodopsin and its functional variants - potential applications in modern optics, N. Hampp, C. Brauchle.

1,351 citations

Journal ArticleDOI
TL;DR: Two new chemically stable [acid and base] 2D crystalline covalent organic frameworks (COFs) were synthesized using combined reversible and irreversible organic reactions and showed strong resistance toward acid and boiling water and exceptional stability in base.
Abstract: Two new chemically stable [acid and base] 2D crystalline covalent organic frameworks (COFs) (TpPa-1 and TpPa-2) were synthesized using combined reversible and irreversible organic reactions. Syntheses of these COFs were done by the Schiff base reactions of 1,3,5-triformylphloroglucinol (Tp) with p-phenylenediamine (Pa-1) and 2,5-dimethyl-p-phenylenediamine (Pa-2), respectively, in 1:1 mesitylene/dioxane. The expected enol–imine (OH) form underwent irreversible proton tautomerism, and only the keto–enamine form was observed. Because of the irreversible nature of the total reaction and the absence of an imine bond in the system, TpPa-1 and TpPa-2 showed strong resistance toward acid (9 N HCl) and boiling water. Moreover, TpPa-2 showed exceptional stability in base (9 N NaOH) as well.

1,202 citations

Journal ArticleDOI
TL;DR: Polymorphism is the ability of any element or compound to crystallize as more than one distinct crystal species (e.g., carbon as cubic diamond or hexagonal graphite).

894 citations

Journal ArticleDOI
TL;DR: In this paper, a donor-donor-acceptor−acceptor −acceptor (DDAA) array of hydrogen bonding sites in the 4[1H]-pyrimidinone tautomer was used to preorganize the molecules for dimerization.
Abstract: 6-Methyl-2-butylureidopyrimidone dimerizes via four hydrogen bonds in the solid state as well as in CHCl3 solution via a donor−donor−acceptor−acceptor (DDAA) array of hydrogen bonding sites in the 4[1H]-pyrimidinone tautomer. An intramolecular hydrogen bond from the pyrimidine NH group to the urea oxygen atom preorganizes the molecules for dimerization. The dimerization constant of the dimer in CHCl3 exceeds 106 M-1. In CHCl3 containing DMSO, the dimer is in equilibrium with the monomeric 6[1H]-pyrimidinone tautomer. In 6-phenyl-2-butylureidopyrimidone, the 4[1H]-pyrimidinone tautomer coexists with the pyrimidin-4-ol form, which dimerizes with similar high dimerization constants via four hydrogen bonds in a DADA array. The latter tautomer predominates in derivatives with electronegative 6-substituents, like 6-nitrophenyl- and 6-trifluoromethyl-2-butylureidopyrimidone. Due to its simple preparation and high dimerization constant, the ureidopyrimidone functionality is a useful building block for supramolecu...

673 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present an overview of recent research on transition metal complexes of quinone ligands that exhibit reversible shifts in charge distribution under equilibrium conditions, which has been considered as an example of valence tautomerism.

592 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023242
2022475
2021200
2020243
2019208
2018204