1,1,8,8-Tetramethyl[8](2,11)teropyrenophane: Half of an Aromatic Belt and a Segment of an (8,8) Single-Walled Carbon Nanotube

摘要

Cyclacenes, for example, [12]cyclacene (1; Figure 1), and cyclophenacenes, for example, cyclo[12]phenacene (2), are aromatic belts that map onto the surfaces of various fullerenes and single-walled carbon nanotubes (SWCNTs). Indeed, they can be viewed as the shortest possible open-ended (uncapped) zig-zag and armchair single-walled carbon nanotubes, respectively. Although interest in the synthesis of aromatic belts, especially cyclacenes, predates the discovery of the fullerenes and SWCNTs by decades,the discovery of SWCNTs and their homology to aromatic belts has engendered more intense synthetic and theoretical interest, not only in cyclacenes and cyclophenacenes, but also in related aromatic/conjugated belts. Of particular interest to us are the Vogtle belts, for example, 3, which are armchair SWCNT segments having a pyrenoid or rylenoid motif, depending upon one's perspective.