Oxygen‐ and Nitrogen‐Embedded Zigzag Hydrocarbon Belts
Mei‐Ling Tan, Qing‐Hui Guo, Xueyuan Wang, Tan‐Hao Shi, Qian Zhang, Sheng‐Kai Hou, Shuo Tong, Jingsong You, Mei‐Xiang Wang
Abstract
Abstract Despite the aesthetically appealing structures and tantalizing physical and chemical properties, zigzag hydrocarbon belts and their heteroatom‐embedded analogues remain challenging synthetic targets. We report herein the synthesis of diverse O/N‐doped zigzag hydrocarbon belts based on selective bridging of the fjords of resorcin[4]arene derivatives through intramolecular S N Ar and palladium‐catalyzed intermolecular C−N bond formation reactions. Preorganized conformations of mono‐macrocyclic, half‐belt and quasi‐belt compounds were revealed to facilitate cyclization reactions to construct heteroatom‐linked octahydrobelt[8]arenes. The acquired products had strained square‐prism‐shaped belt structures in which all six‐membered heterocyclic rings adopted an unusual boat conformation with equatorially configured alkyl groups. The unprecedented heteroatom‐bearing belts also exhibited different photophysical and redox properties to those of octahydrobelt[8]arene analogues.