K. Sasaki et al., THE SYNTHESIS OF NOVEL POLYCYCLIC HETEROCYCLIC RING-SYSTEMS .2. NAPHTHO[2,1-B 4,3-G]BISBENZO[B]THIOPHENE/, Journal of heterocyclic chemistry, 33(3), 1996, pp. 847-853
The novel polycyclic heterocyclic ring system, naphtho[2,1-b:4,3-g]bis
benzo[b]thiophene was synthesized from 3-thienyl)ethenyl]naphtho[2,1-b
][1]benzothiophene. The assignment of its H-1 and C-13 nmr spectra was
also accomplished by utilizing two-dimensional nmr methods.