Pariser–Parr–Pople-type SCF MO and semiempirical magnetic-susceptibility calculations show that trinaphtho[abc,ghi,mno]- and two kinds of triazuleno[abc,ghi,mno][18]annulenes have large diamagnetic susceptibilities and aromatic-islands structures in which three naphthalenes or three azulenes are linked by three olefinic bridges, whereas tripentaleno[abc,ghi,mno]- and triheptaleno[abc,ghi,mno][18]annulenes have small diamagnetic susceptibilities and polyolefine structures where bond alternations are distributed all over their molecular planes.
KataokaM. and NakajimaT., J. Chem. Soc., Perkin Trans. 2, 1986, 1529
12.
KataokaM., ToyotaA. and NakajimaT., J. Chem. Soc., Perkin Trans. 2, 1988, 1633
13.
KataokaM. and ToyotaA., J. Chem. Res. (S), 1998, 278.
14.
YamaguchiH. and NakajimaT., Bull. Chem. Soc. Jpn., 1974, 47, 1898.
15.
KataokaM., J. Tohoku Pharmaceutical University, 1999, 46, 219. Since this paper was written in Japanese, it is limited in availability. For comparison, therefore, parts of the results are given in the present paper.
