4609-11-4Relevant articles and documents
Ring-opening of tertiary cyclopropanols derived from β-diketones
Li, Le-Zhen,Xiao, Bin,Guo, Qing-Xiang,Xue, Song
, p. 7762 - 7771 (2007/10/03)
The ring-opening reaction of 1,2-disubstituted cyclopropanols, prepared from β-diketones, mediated by Cu(NO3)2, p-TsOH, and NaOH is reported. The Cu(II)-mediated ring-opening of cyclopropanols gave α-methylene-γ-diketones in good yie
Electrooxidative formation of 1,2-diaroylcyclopropanes from 1,3-diaroylpropanes in the presence of KI
Okimoto, Mitsuhiro,Takahashi, Yukio,Kakuchi, Toyoji
, p. 207 - 208 (2007/10/03)
Various 1,2-diaroylcyclopropanes were obtained in good yields by the indirect electrochemical oxidation of 1,3-diaroylpropanes in the presence of catalytic amounts of KI under very mild conditions.
Synthesis, Fe(II)-induced degradation, and antimalarial activities of 1,5-diaryl-6,7-dioxabicyclo[3.2.2]nonanes: Direct evidence for nucleophilic O-1,2-aryl shifts
Kamata, Masaki,Ohta, Motoko,Komatsu, Ken-Ichi,Kim, Hye-Sook,Wataya, Yusuke
, p. 2063 - 2067 (2007/10/03)
1,5-Diaryl-6,7-dioxabicyclo[3.2.2]nonanes 1a-d (1a: Ar=p-FC6H4, 1b: Ar=Ph, 1c: Ar=p-MeC6H4, 1d: Ar=p-MeOC6H4) were prepared by a modified method of photo-electron transfer oxygenation, and the reactions of 1 with FeBr2 were investigated under various conditions. The Fe(II)-induced degradation of 1 afforded various rearrangement products and fragmentation products through competitive single electron transfer (SET) and Lewis acid pathways. Direct evidence for the O-1,2-aryl shift was obtained by the isolation of rearrangement products, 1-aryloxy-5-aryl-8-oxabicyclo[3.2.1]octanes 8. The degradation mechanism was proposed and the in vitro antimalarial activities were also evaluated.
Synthesis and fluorescence emission behavior of anti-[2.3](3,10)phenanthrenophane: Overlap between phenanthrene rings required for excimer formation
Nakamura, Yosuke,Fujii, Takahiro,Nishimura, Jun
, p. 970 - 971 (2007/10/03)
Novel anti-[2.3](3,10)phenanthrenophane 3, prepared by the intramolecular [2 + 2] photocycloaddition of 1,3-bis(3-vinyl-10-phenanthryl)propane, exhibited monomer fluorescence. This is in a remarkable contrast with the excimer fluorescence emission from an
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.
Highly Selective Aldol Reaction of Dibenzoylmethanes with Formaldehyde Catalyzed by Cobalt Schiff Base Complex under Neutral Conditions
Maruyama, Kazushige,Kubo, Katsunobu,Toda, Yukinobu,Kawase, Kazuhiko,Mashino, Takahiro,Nishinaga, Akira
, p. 5609 - 5612 (2007/10/02)
Coordinatively saturated hydroxocobalt(III) Schiff base complexes catalyze highly selective aldol reaction of dibenzoylmethanes with formaldehyde in methanol to give 1,3-dibenzoylpropanes, resulting from retro-Claisen reaction of 1,1,3,3-tetrabenzoylpropanes, which are obtained quantitatively in dichlorometane.Coordinatively saturated cobalt(III) Schiff base complexes ligating a substrate anion as a monodentate ligand is found to be the reactive species.