Results 181 to 190 of about 6,678 (238)
Some of the next articles are maybe not open access.
Photoisomerization in Rhodopsin
Biochemistry (Moscow), 2001This article reviews the primary reaction processes in rhodopsin, a photoreceptive pigment for twilight vision. Rhodopsin has an 11-cis retinal as the chromophore, which binds covalently with a lysine residue through a protonated Schiff base linkage.
H, Kandori, Y, Shichida, T, Yoshizawa
openaire +2 more sources
Photoisomerization of Perfluoroaryltetrahedranes to Perfluoroarylcyclobutadienes
Journal of the American Chemical Society, 2011Two perfluoroaryl-substituted cyclobutadiene derivatives, 6 and 7, were prepared as air- and moisture-sensitive red solids by the photochemical isomerization of the corresponding tetrahedranes (4 and 5, respectively). Remarkably, the 9,10-dicyanoanthracene-sensitized photochemical reaction of 4 also proceeded, giving 6, and the mechanism of this ...
Yusuke, Inagaki +2 more
openaire +2 more sources
Optimal Control of Photoisomerization
Physical Review Letters, 2005We report on optimal control of the photoisomerization of 3,3-diethyl-2,2-thiacyanine iodide dissolved in methanol. Enhancement and reduction of the relative yield of cis to trans isomers are achieved; i.e., the quantum efficiency of the photoisomerization is controlled with optimally phase and amplitude shaped 400 nm femtosecond laser pulses.
G, Vogt +4 more
openaire +2 more sources
Photoisomerization kinetics of trifloxystrobin
Analytical and Bioanalytical Chemistry, 2005The photoisomerization kinetics of trifloxystrobin (TFS) in acetone under artificial sunlight is reported. HPLC analysis showed the TFS, a strobilurine fungicide of EE conformation, was converted into an equilibrium mixture of four isomers after illumination for 7 h.
Kaushik, Banerjee +2 more
openaire +2 more sources
A New Photoisomerization of Bilirubin
Photochemistry and Photobiology, 1999AbstractPhotoirradiation of solutions of natural (4Z,15Z)‐biliru‐bin‐IXα in chloroform with ˜366 nm UV light leads rapidly to a new photoisomer that has been characterized by NMR spectroscopy and by its (ground‐state reaction) adducts with methanol and other protic nucleophiles. Unlike the previously described Z →E geometric isomeri‐zation important in
L, Cheng, D A, Lightner
openaire +2 more sources
Role of Viscosity Effect on Photoisomerization
International Conference on Luminescence - 1984, 1984Many rate processes like diffusion, dielectric relaxation, electron transfer reactions, nonradiative decay etc..., in dense media can be treated from a unified quantum statistical mechanical viewpoint [1]. In these unimolecular rate processes, one can regard that two potential surfaces, say a and b, are involved.
Villaeys, A. A. +2 more
openaire +2 more sources
Photoisomerization of Phenylazoalkenes
Helvetica Chimica Acta, 1981Abstract(E)‐Phenylazocyclohexene (1) undergoes photoisomerization to s‐cis‐(Z)‐phenylazocyclohexene (2). Compound 2 reisomerizes to 1 at room temperature.
Joachim G. Schantl, Paul Margaretha
openaire +1 more source
Photoisomerization of bentazone
Tetrahedron Letters, 1989Abstract Photolysis of bentazone 1 in non-polar solvents e.g. n-hexane yields the unexpected photoproduct 2 . On irradiation in methanol and in water 1-methylbentazone and anthranilic acid isopropylamide as a degradation product are observed.
Klaus Hustert, Mohammed Mansour
openaire +1 more source
The photoisomerization of dihydrocostunolide
Tetrahedron, 1976Abstract Photoisomerization of the germacranolid dihyrocostunolide (2) proceeds with a high degree of regio-and stereoselectivity to give the guaianolide photunolide (16) as the only major product. The conversion of photunolide to two guaianolides of known structure (8 and 9) and synthesis from O-acetylisophotosantonic lactone (11) provide ...
Rudolph E.K. Winter, Richard F. Lindauer
openaire +1 more source