scholarly journals The Rate of Reaction in Solutions Containing Potassium Iodide, Potassium Chlorate, and Hydrochloric Acid

1903 ◽  
Vol 7 (2) ◽  
pp. 92-117 ◽  
Author(s):  
W. C. Bray
Keyword(s):  
Hydrochloric Acid ◽  
Potassium Iodide ◽  
Potassium Chlorate ◽  
Rate Of Reaction

scholarly journals Flavin-photosensitized reactions of retinal and stilbene

1970 ◽  
Vol 120 (4) ◽  
pp. 673-681 ◽  
Author(s):  
Ann Gordon-Walker ◽  
G. K. Radda
Keyword(s):  
Triplet State ◽  
Diethyl Ether ◽  
Potassium Iodide ◽  
Substrate Concentration ◽  
Transition Energies ◽  
Photostationary State ◽  
Rate Of Reaction ◽  
Paramagnetic Ions

1. Retinol and stilbene are both isomerized when they are illuminated anaerobically in the presence of flavins. 2. Triplet quenchers (e.g. oxygen, potassium iodide and paramagnetic ions) inhibit the reaction more efficiently than they quench flavin fluorescence. At 77°C in a diethyl ether–isopentane–ethanol (5:5:2) glass retinol quenches flavin phosphorescence, but not its fluorescence. 3. For the stilbene reaction cis/trans photostationary-state mixtures are obtained with different flavins and these are linearly related to the phosphorescence transition energies of the flavins used. 4. The reaction involves the triplet state of flavin and a scheme for the reaction is suggested. 5. The dependence of the rate of reaction on substrate concentration is explicable in terms of this scheme. 6. The photobleaching of rhodopsin sensitized by flavin is also demonstrated.

scholarly journals I. Contributions to the history of orcin.—No. II. Chlorine- and bromine-substitution compounds of the orcins

1872 ◽  
Vol 20 (130-138) ◽  
pp. 72-80
Keyword(s):  
Melting Point ◽  
Hydrochloric Acid ◽  
Potassium Chlorate ◽  
The Other ◽  
Crystalline Substance ◽  
History Of ◽  
Bromine Substitution

Schunck, and subsequently the author of this paper*, many years ago studied the action of chlorine upon orcin, and obtained more or less crystalline products, contaminated with a brown resinous matter, from which however, they did not succeed in separating the crystals in a state of purity. In the year 1864 De Luynes § obtained a crystalline substance by acting on orcin with a mixture of potassium chlorate and hydrochloric acid. De Luynes states it to be trichlororcine, C 7 H 5 Cl 3 O 2 , and in Kekule’s 'Benzolderivate' the melting-point is given at 159°. Pentachlororcin ,C 7 H 3 Cl 5 O 2 . -This compound was obtained by the action of chlorine upon orcin when the former was kept in excess. Two methods of effecting this object were employed,— the first by adding the orcin to chlorine hydrate, the other by the action of potassium chlorate and hydrochloric acid.

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