Synthesis and Characterization of Expanded Radialenes, Bisradialenes, and Radiaannulenes

摘要

Shape-persistent, conjugated macrocycles have been designed to exhibit a broad spectrum of interesting attributes and topologies. Over the past two decades amazing progress has been made towards the synthesis of these macrocycles, which have remarkable electronic, optical, nonlinear optical, and supramolecular properties. A subset of this general class of molecules are the radialenes (1) and expanded radialenes (2 and 3; see Scheme 1), which arise from the formal insertion of acetylene units into the framework of a radialene molecule. A related class of macrocycles, radiaannulenes (4, Scheme 1), contain both endo- and exocyclic vinyl segments within the conjugated core.