A Conjugated Covalent Template Strategy for All-Benzene Catenane Synthesis
An Bu1,2, Yongye Zhao1, Hongyan Xiao3
1Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
Abstract:
Mechanically interlocked molecules based on oligoparaphenylene-derived nanohoops, particularly those without heteroatoms, are synthetically challenging and topologically intriguing targets. Herein, a π-conjugated covalent template strategy based on azo group has been developed, which features dual intramolecular macrocyclizations directed by a tetra-substituted azobenzene core, followed by traceless removal of the azo linker. Employing this strategy, the efficient synthesis of a novel all-benzene [2]catenane consisting of meta-cycloparaphenylenes has been accomplished.
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