Results 121 to 130 of about 873 (170)
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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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Hydantoins, thiohydantoins, glycocyamidines—36
Tetrahedron, 1973Abstract In contrast to the α-chloroamides 1a-c which, when reacted with potassium N-cyanoanilide, furnish anomalous substitution products ( 2a-c ), the related nitrile and ester yields normal substitution products ( 3a and b ) under the same conditions.
Gy. Simig, K. Lempert, J. Tamás
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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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Staudinger Condensation for the Preparation of Thiohydantoins
Synthesis, 2014An efficient one-pot, two-step sequence starting from azide derivatives is described: first, formation of iminophosphoranes (Staudinger reaction) and condensation with carbon disulfide to form nonisolated isothiocyanates; then, condensation with α-amino esters to provide new N-3-substituted 2-thiohydantoins.
Gosling, Sandrine +2 more
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IR absorption spectrum of thiohydantoin
Soviet Physics Journal, 1970The IR absorption spectrum of thiohydantoin is found in the range 400–3500 cam−1, and the normal-mode frequencies are calculated on the basis of a model. The IR spectrum is interpreted on the basis of the theoretical results, the experimental x-ray spectrum, and the microwave dielectric constants.
R. S. Lebedev +3 more
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Thiohydantoins. I. The Preparation of Some 2-Thiohydantoins from Amino Acids and Acylamino Acids
Australian Journal of Scientific Research Series A: Physical Sciences, 1952A reinvestigation of the stepwise degradation of peptides and proteins by the Schlack and Kumpf (1926) procedure, which involves conversion of the terminal carboxyl residue to a 5-substituted-2-thiohydantoin; has been undertaken. The following amino acids or their aoetyl derivatives have been converted by warming with acetic anhydride and ammonium ...
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Synthesis of Thiohydantoin-Castanospermine Glycomimetics as Glycosidase Inhibitors
The Journal of Organic Chemistry, 2009The preparation of bicyclic carbohydrate mimics related to (+)-castanospermine incorporating a thiohydantoin moiety is reported. The synthetic approach is compatible with molecular diversity-oriented strategies and involves alpha-azidoesters, built at the C-5/C-6 segment in gluco- or galactofuranose scaffolds, as the key precursors.
Aguilar Moncayo, Matilde +3 more
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