Ligand-Free Iron-Catalyzed Carbon (sp<sup>2</sup>)–Carbon (sp<sup>2</sup>) Oxidative Homo-Coupling of Alkenyllithiums
作者:Zhuliang Zhong、Zhi-Yong Wang、Shao-Fei Ni、Li Dang、Hung Kay Lee、Xiao-Shui Peng、Henry N. C. Wong
DOI:10.1021/acs.orglett.8b03893
日期:2019.2.1
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 oxidativehomo-coupling eventually led to the formation of 1,3-butadienes in acceptable to excellent isolated yields.
water-soluble diphenylbutadiene-cored poly(arylether) 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