Results 151 to 160 of about 1,063 (182)

Thiohydantoins. X. Kinetic Studies of the Acid Hydrolysis of 1-Acyl-2-thiohydantoins

Canadian Journal of Chemistry, 1972
The 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
openaire   +1 more source

Thiohydantoins. VII. Ionization and ultraviolet spectra of 4-thiohydantoins and 2,4-dithiohydantoins

Canadian Journal of Chemistry, 1969
The 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
openaire   +1 more source

Copper(I) halide complexes of 2-thiohydantoin and 5,5-diphenyl-2-thiohydantoin

Polyhedron, 2012
Abstract 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, S. Kyritsis, M. Lalia-Kantouri, B. Wicher, M. Gdaniec   +4 more
openaire   +1 more source

Thiohydantoins. XI Kinetic Studies of the Alkaline Hydrolysis of 1-Acyl-2-thiohydantoins

Canadian Journal of Chemistry, 1972
1-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
openaire   +1 more source

Thiohydantoins. II. Thiohydantoins Derived from Aspartic and Glutamic Acids

Australian Journal of Scientific Research Series A: Physical Sciences, 1952
N-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 ...
openaire   +1 more source

Synthesis of 5-Chloromethylene Hydantoins and Thiohydantoins

HETEROCYCLES, 2007
AbstractChemInform 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
openaire   +1 more source

IR absorption spectrum of thiohydantoin

Soviet Physics Journal, 1970
The 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, R. P. Chumakova, V. N. Yukhimets, V. I. Yakimenko   +3 more
openaire   +1 more source

Atroposelective Synthesis of Axially Chiral Thiohydantoin Derivatives

The Journal of Organic Chemistry, 2016
Nonracemic axially chiral thiohydantoins were synthesized atroposelectively by the reaction of o-aryl isothiocyanates with amino acid ester salts in the presence of triethylamine (TEA). The synthesis of the nonaxially chiral derivatives, however, gave thiohydantoins racemized at C-5 of the heterocyclic ring.
Sevgi, Sarigul, Ilknur, Dogan
openaire   +2 more sources

Condensation on Alumina. III. Synthesis of 5-Alkylidene, 2-Thiohydantoin from 3-Acetyl, 2-Thiohydantoin

Synthetic Communications, 1987
Abstract A convenient procedure for the synthesis of 5-alkylidene, 2-thiohydantoin is described.
D. Villemin, M. Ricard
openaire   +1 more source

5,5-Diaryl-2-thiohydantoins and 5,5-diaryl N3-substituted 2-thiohydantoins as potential hypolipidemic agents

Journal of Medicinal Chemistry, 1986
A series of 5,5-diaryl-2-thiohydantoins and 5,5-diaryl-N3-substituted-2-thiohydantoins related to 5,5-diphenyl-2-thiohydantoin (DPTH) were investigated as potential hypolipidemic agents with the goal of increased potency over DPTH itself. In the 5,5-diaryl class, the best results were obtained by substituting two pyridyl rings for the phenyl rings ...
openaire   +2 more sources