K. Sasaki et al., THE SYNTHESIS OF NOVEL POLYCYCLIC HETEROCYCLIC RING-SYSTEMS .1. BENZO[E][1]BENZOTHIENO[3,2-G][1]BENZOTHIOPHENES, Journal of heterocyclic chemistry, 32(6), 1995, pp. 1735-1740
The novel polycyclic heterocyclic ring system compound, methyl 3-chlor
obenzo[e][1]benzothieno[3,2-g] [1]benzothiophene-2-carboxylate was syn
thesized. The assignment of its H-1 and C-13 nmr spectra was also acco
mplished by utilizing two-dimensional nmr methods.