1338381-89-7Relevant academic research and scientific papers
Extremely efficient photoisomerization of water-soluble diphenylbutadiene dendrimers
Miura, Yousuke,Momotake, Atsuya,Kanna, Yoko,Nishimura, Yoshinobu,Arai, Tatsuo
, p. 802 - 806 (2012)
A water-soluble diphenylbutadiene-cored poly(aryl ether) dendrimer, together with a corresponding lipophilic diphenylbutadiene dendrimer and a standard compound, (1E,3E)-1,4-bis(3,5-dimethoxyphenyl)buta-1,3-diene, were prepared and their photochemical properties were examined. The water-soluble dendrimer in aqueous solution exhibited an extremely high photoisomerization quantum yield (Φiso = 0.64), whereas the quantum yield of the bis(3,5-dimethoxyphenyl)butadiene reference compound in THF was much lower (Φiso = 0.26). The excitation spectra of the water-soluble dendrimer strongly depended on the emission wavelength and the fluorescence lifetime contained several components. These results indicate that the core unit in the water-soluble dendrimer adopts multiple conformations, one of which is distorted and can undergo photoisomerization quite easily.
Ligand-Free Iron-Catalyzed Carbon (sp2)-Carbon (sp2) Oxidative Homo-Coupling of Alkenyllithiums
Zhong, Zhuliang,Wang, Zhi-Yong,Ni, Shao-Fei,Dang, Li,Lee, Hung Kay,Peng, Xiao-Shui,Wong, Henry N. C.
supporting information, p. 700 - 704 (2019/02/07)
A new strategy was developed for the efficient synthesis of di-, tetra-, and hexa-substituted 1,3-butadienes. This one-pot procedure involves lithium-iodine exchange to generate the corresponding vinyllithium intermediates. A subsequent iron-catalyzed ligand-free oxidative homo-coupling eventually led to the formation of 1,3-butadienes in acceptable to excellent isolated yields.
Copper(I)-catalyzed stereoselective hydrogenation of 1,3-diynes and enynes
Thiel, Niklas O.,Kemper, Sebastian,Teichert, Johannes F.
supporting information, p. 5023 - 5028 (2017/07/27)
A stereoselective hydrogenation of 1,3-diynes with an air-stable copper(I)/N-heterocyclic carbene complex, [IPrCuOH], has been developed. The corresponding products, 1,3-dienes, are obtained in a stereoselective manner depending on their substitution pattern: Diaryl-diynes yield E,E-1,3-dienes, whereas dialkyl-diynes are converted to the corresponding Z,Z-1,3-dienes. Hydrogenation and deuteration experiments with enynes indicate that these are competent reaction intermediates in the hydrogenation of diynes.
