60253-07-8Relevant academic research and scientific papers
Metal-free cycloisomerizations of: O -alkynylbiaryls
Zhang, Jingyi,Li, Siqi,Qiao, Yan,Peng, Cheng,Wang, Xiao-Na,Chang, Junbiao
supporting information, p. 12455 - 12458 (2018/11/20)
We describe a novel and highly efficient metal-free strategy to construct 9,9-disubstituted fluorenes and phenanthrenes via the TfOH-catalyzed cycloisomerizations of o-alkynylbiaryls. Notably, the significant effects of the electronic properties and steric hindrance of the alkyne terminus on the reaction selectivity have been observed.
Iridium-Catalyzed Formal [4 + 1] Cycloaddition of Biphenylenes with Alkenes Initiated by C-C Bond Cleavage for the Synthesis of 9,9-Disubstituted Fluorenes
Takano, Hideaki,Kanyiva, Kyalo Stephen,Shibata, Takanori
supporting information, p. 1860 - 1863 (2016/05/19)
An Ir-catalyzed intermolecular reaction of biphenylenes as a C4 unit with various alkenes as a C1 unit gave 9,9-disubstituted fluorenes in moderate to high yields. Preliminary mechanistic studies revealed that this formal [4 + 1] cycloaddition probably pr
