Results 141 to 150 of about 697 (188)
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Tetrahedron Letters, 2000
Abstract An efficient solid-phase synthesis method is described for branched thiohydantoin benzimidazolinethiones and branched thiohydantoin tetrahydroquinoxalinediones using 4-fluoro-3-nitrobenzoic acid.
Adel Nefzi +2 more
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Abstract An efficient solid-phase synthesis method is described for branched thiohydantoin benzimidazolinethiones and branched thiohydantoin tetrahydroquinoxalinediones using 4-fluoro-3-nitrobenzoic acid.
Adel Nefzi +2 more
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Synthesis of 5-Chloromethylene Hydantoins and Thiohydantoins
HETEROCYCLES, 2007AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Timothy A. Cernak, James L. Gleason
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Thiohydantoins. VI. Hydrolysis of 1-acyl-2-thiohydantoins: reported anomalies
Canadian Journal of Chemistry, 1968Two reports in which it was claimed that the 1-acyl group of a 1-acyl-2-thiohydantoin was not rapidly removed by dilute acid or alkali were investigated and found erroneous.
J. T. Edward, J. K. Liu
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Thiohydantoins. VII. Ionization and ultraviolet spectra of 4-thiohydantoins and 2,4-dithiohydantoins
Canadian Journal of Chemistry, 1969The acid and base dissociation constants of 5,5-pentamethylene-4-thiohydantoin, 5,5-pentamethylene-2,4-dithiohydantoin, and their 1-methyl derivatives, have been determined by ultraviolet studies in basic and acid media. In aqueous sulfuric acid the 4-thiohydantoins are protonated on oxygen at the 2-position, so that the extent of protonation varies ...
J. T. Edward, J. K. Liu
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Thiohydantoins. X. Kinetic Studies of the Acid Hydrolysis of 1-Acyl-2-thiohydantoins
Canadian Journal of Chemistry, 1972The rates of hydrolysis of 22 1-acyl-2-thiohydantoins in aqueous sulfuric acid to give 2-thiohydantoin and a carboxylic acid have been determined. In 0–90% sulfuric acid, hydrolysis takes place by an A-2 mechanism, and the rate reaches a maximum in about 70% acid.
Wayne Irvine Congdon, John Thomas Edward
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Thiohydantoins. XI Kinetic Studies of the Alkaline Hydrolysis of 1-Acyl-2-thiohydantoins
Canadian Journal of Chemistry, 19721-Acyl-2-thiohydantoins ionize in alkaline solution (pK ∼ 7). In solutions more alkaline than pH > 11 they are rapidly hydrolyzed to 2-thiohydantoin and a carboxylic acid, by attack of a hydroxide ion on the conjugate base of the 1-acyl-2-thiohydantoin.
Wayne I. Congdon, John T. Edward
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Copper(I) halide complexes of 2-thiohydantoin and 5,5-diphenyl-2-thiohydantoin
Polyhedron, 2012Abstract A series of copper(I) halide complexes formulated as [CuX(L)2] [X = Cl, Br; L = 2-thiohydantoin (th) and 5,5-diphenyl-2-thiohydantoin (dpth)] were prepared and their photophysical and thermal (TG–DTA) behaviour was investigated. Further treatment of these complexes with triphenylphosphane gave mixed-ligand compounds [CuX(L)(PPh3)2 ...
P. Aslanidis +4 more
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Acta Crystallographica Section C Crystal Structure Communications, 1998
In the title compound (1-acetyl-4-oxoimidazolidine-2-thione, C5H6N2O2S), the plane of the acetyl group forms an angle of 6.7° with the essentially planar thiohydantoin ring. N—H⋯O hydrogen bonds create quasiplanar chains of molecules along the y axis.
J. S. Casas +5 more
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In the title compound (1-acetyl-4-oxoimidazolidine-2-thione, C5H6N2O2S), the plane of the acetyl group forms an angle of 6.7° with the essentially planar thiohydantoin ring. N—H⋯O hydrogen bonds create quasiplanar chains of molecules along the y axis.
J. S. Casas +5 more
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Thiohydantoins. II. Thiohydantoins Derived from Aspartic and Glutamic Acids
Australian Journal of Scientific Research Series A: Physical Sciences, 1952N-Acyl derivatives of the &carboxylic acids, aspartic and glutamic acids, yield the corresponding anhydrides when heated with acetic anhydride in the presence or absence of ammonium thiocyanate. In general these anhydrides form isomeric pairs of amides and anilides, and only one of each pair can be converted into the corresponding 2-thiohydantoin ...
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Acta Crystallographica Section C Crystal Structure Communications, 1998
The molecular structure of the title compound, 5,5-diphenyl-2-thioxoimidazolidin-4-one, C 15 H 12 N 2 OS, resembles that of 5,5-diphenylhydantoin (phenytoin). The C=S distance is 1.648 (2) A. The crystal structure consists of ribbon-like infinite sheets of molecules bonded by N-H...O and N-H...S hydrogen bonds.
A. W. Roszak, D. F. Weaver
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The molecular structure of the title compound, 5,5-diphenyl-2-thioxoimidazolidin-4-one, C 15 H 12 N 2 OS, resembles that of 5,5-diphenylhydantoin (phenytoin). The C=S distance is 1.648 (2) A. The crystal structure consists of ribbon-like infinite sheets of molecules bonded by N-H...O and N-H...S hydrogen bonds.
A. W. Roszak, D. F. Weaver
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