Boron-based rotaxanes by multicomponent self-assembly

摘要

The multicomponent reaction of 1,2-di(4-pyridyl)ethylene, catechol, 3,5-bis(trifluoromethyI)phenylboronic acid and 1,5-dinaphtho-38-crown-10 or bis-para-phenylene-34-crown-10, respectively, resulted in the formation of rotaxanes, which were characterized by X-ray crystallography. Over recent years, the perception of rotaxanes has changed substantially. Whereas initially they represented "exotic molecules" and an "intriguing synthetic challenge", they are now recognized as key components of molecular nanotechnology. The basis for this development was the discovery of efficient synthetic routes to construct such mechanically interlocked species. The most common strategies rely on preorganized building blocks, which are locked by covalent capture under kinetic control.