Synthesis of Strained Macrocyclic Biaryls for Enthalpy-Driven Ring-Opening Polymerization
作者:Howard M. Colquhoun、Zhixue Zhu、Christopher C. Dudman、Caroline A. O'Mahoney、David J. Williams、Michael G. B. Drew
DOI:10.1021/ma0517796
日期:2005.12.1
Polymerizable macrocyclic biarylene-ether-ketones and biarylene-ether-sulfones are accessible from linear, bis(chloro)-terminated oligomers via nickel-catalyzed, intramolecular coupling under pseudo-high-dilution conditions. Single-crystal X-ray analyses of the resulting cyclo-oligomers reveal extremely distorted and highly strained geometries, with 4,4 '-biphenylene units showing deviations of up to 70 degrees from linearity.