Extended Barbaralanes: Sigmatropic Shiftamers or σ-Polyacenes?

摘要

Starting from fused barbaralanes, we come (theoretically) to a new class of delocalized molecules in which two polyenyl radical chains interact with each other through space in a bonding way, but do not form full σ-bonds. These molecules resemble σ-homologues of polyacenes and are bishomoaromatic.