Syntheses and characterizations of dibenzochrysenophane and biphenylodibenzochrysenophane directed toward preparation of 8-shaped closed circulenes

Syntheses of [2.2](3,11)dibenzo [c,l]chrysenophane, [2.2](4,4')-biphenylo(3,11)dibenzo [c,l] chrysenophane, and [2.2](4,4')biphenylo-(3,11)dibenzo[c,l]chrysenophadiene are described. The unusually strained structures were supported by their H-1-NMR spectra, electronic spectra, and X-ray crystallographic analyses.