Biphenylenes can be easily and efficiently obtained at low temperature by the organolithium-mediated cyclization of halobiphenyls via an aryne intermediate. This synthetic protocol provides an advantage for the direct and controlled functionalization at the C1 position.
Synthesis of Biphenylenes and Their π-Extended Derivatives
作者:Ming-Lun Pan、Yao-Ting Wu
DOI:10.1055/s-0039-1690750
日期:2020.1
A series of biphenylenes and their π-extended derivatives are easily prepared through tert-butyllithium-mediated cyclization of suitable halobiaryls and haloteraryls, respectively. The reactions proceed via the corresponding arynyl intermediates at low temperature (up to –20 °C).
Methods for preparing rigid-rod macromonomers with reactive end groups
申请人:Maxdem Incorporation
公开号:US05973075A1
公开(公告)日:1999-10-26
Methods for preparing rigid-rod macromonomers having a polyaromatic backbone, solubilizing side groups, and reactive end groups are provided. Such methods include catalytic reductive coupling of substituted 1,4-dihaloaromatic compounds in the presence of an endcapping moiety.