Nl. Frank et al., PARTIAL BOND LOCALIZATION IN THE CRYSTAL-STRUCTURE OF TRISBICYCLO[2.2.1]HEPTABENZENE AND ITS EFFECT ON CR-ARENE DYNAMICS, Tetrahedron letters, 36(25), 1995, pp. 4389-4392
Trisbicyclo[2.2.1]heptabenzene 3 crystallizes in space group P2(1)/c w
ith cell dimensions a = 5.992 Angstrom, b = 17.288 Angstrom, c = 14.84
3 Angstrom. Mild bond localization is seen in the benzene ring (d(exo(
ave))= 1.379 Angstrom; d(endo(ave)) = 1.417 Angstrom) and the annelati
on angle C-(ar)-C-(ar)-C-(CH) is constricted to 106.5 degrees. The str
ucture supports a bicyclic strain effect on the bond localization in b
enzenoid aromatics.