M. Sato et al., CONVENIENT SYNTHESIS AND REDUCTION PROPERTIES OF [7]CIRCULENE, Journal of the Chemical Society. Perkin transactions. II (Print), (9), 1998, pp. 1909-1913
Saddle-shaped [7]circulene (1) is prepared by an extremely simple proc
edure that involves a 2,15-ethano-bridged hexahelicene intermediate. R
eduction properties of the [7]circulene have been investigated by mean
s of voltammetry and ESR spectroscopy and compared with those of plana
r [6]circulene (coronene) (2).