94383-67-2Relevant articles and documents
Flavin Photocatalysts for Visible-Light [2+2] Cycloadditions: Structure, Reactivity and Reaction Mechanism
Mojr, Viktor,Pitrová, Gabriela,Straková, Karolína,Pruka?a, Dorota,Brazevic, Sabina,Svobodová, Eva,Hoskovcová, Irena,Burdziński, Gotard,Slanina, Tomá?,Sikorski, Marek,Cibulka, Radek
, p. 849 - 858 (2018/01/27)
New photocatalysts from the flavin family were found to mediate the [2+2] photocycloaddition reaction. 3-Butyl-10-methyl-5-deazaflavin (3 a) and 1-butyl-7,8-dimethoxy-3-methylalloxazine (2 e), if irradiated by visible light, were shown to allow an efficie
Visible Light [2+2] Photocycloaddition Mediated by Flavin Derivative Immobilized on Mesoporous Silica
?pa?ková, Jessica,Svobodová, Eva,Hartman, Tomá?,Stibor, Ivan,Kopecká, Jitka,Cibulková, Jana,Chudoba, Josef,Cibulka, Radek
, p. 1177 - 1181 (2017/04/14)
7,8-Dimethoxy-3-methylalloxazine was immobilized on mesoporous silica (MCM-41) to provide a heterogenized flavin photocatalyst. Thus, the prepared heterogeneous catalyst 2 was found to sensitize the visible light [2+2] cycloaddition of various types of di
Tailoring flavins for visible light photocatalysis: organocatalytic [2+2] cycloadditions mediated by a flavin derivative and visible light
Mojr, Viktor,Svobodová, Eva,Straková, Karolína,Nevesely, Tomá?,Chudoba, Josef,Dvo?áková, Hana,Cibulka, Radek
, p. 12036 - 12039 (2015/07/28)
A new application of flavin derivatives in visible light photocatalysis was found. 1-Butyl-7,8-dimethoxy-3-methylalloxazine, when irradiated by visible light, was shown to allow an efficient cyclobutane ring formation via an intramolecular [2+2] cycloaddition of both styrene dienes, considered as electron-rich substrates, and electron-poor bis(arylenones), presumably proceeding via an energy transfer mechanism.
Photoinduced Electron Transfer (PET) cyclization and photooxygenation of 2,6-diaryl-1,6-heptadienes and 2,7-diaryl-1,7-octadienes
Griesbeck, Axel G.,Sadlek, Oliver,Polborn, Kurt
, p. 545 - 549 (2007/10/03)
The 2,6-diaryl-substituted 1,6-heptadienes 3a-c and the 2,7-diaryl-substituted 1,7-octadienes 4a-b were cleanly converted into the corresponding anellated cyclobutanes 5 and 6, resp., when irradiated under photoelectron-transfer conditions (9,10-dicyanoanthracene in acetonitrile). Only for 4c did the rearranged compound 7c become the dominant photoproduct. Oxygen trapping experiments with formation of endoperoxides 8, 9 were successful in the case of the electron-rich substrates 3b, c and 4c. VCH Verlagsgesellschaft mbH, 1996.
Electron-transfer induced intramolecular [2+2] cycloaddition of 2,6-diarylhepta-1,6-dienes
Takahashi,Okitsu,Ando,Miyashi
, p. 3953 - 3956 (2007/10/02)
Intramolecular [2+2] cycloaddition of 2,6-diaryl-1,6-heptadienes 1a-c to bicycloheptanes 2 can be induced by electron-transfer photosensitization with 9,10-dicyanoanthracene. A stepwise mechanism involving cyclic 1,4-cation radical 3 has been proposed based on the trapping experiments.
A "frustrated" cope rearrangement: Thermal interconversion of 2,6-diphenylhepta-1,6-diene and 1,5-diphenylbicyclo[3.2.0]heptane
Roth, Wolfgang R.,Lennartz, Hans-Werner,Doering,Birladeanu, Ludmila,Guyton, Catherine A.,Kitagawa, Toshikazu
, p. 1722 - 1732 (2007/10/02)
The title reaction constitutes a reliable model of a nonconcerted, diradical mechanism closely related to a Cope rearrangement. Its activation parameters relate to a transition state approximated by 1,5-diphenylcyclohepta-1,5-diyl (7). Force field calcula