The aromaticity and Möbius characteristics of carbeno[8]heteroannulenes and triplet state annulenes.
Two types of annulene which may show significant Möbius aromatic character and bond and twist delocalisation are proposed; triplet states with 4n + 2 occupancy of the p pi array of atomic orbitals and a novel 8-pi carbeno[8]heteroannulene ring system 1 where the Hückel highly antiaromatic nature as a planar system can be attenuated or even reversed by the C2 symmetric Möbius distortion.
Kastrup
Christian J
CJ
Department of Chemistry, Imperial College, London, UK SW7 2AY.
Oldfield
Steven P
SP
Rzepa
Henry S
HS