Ap. Halverson et al., SYNTHESIS AND TOTAL H-1-NMR ASSIGNMENT OF NAPHTHO[1',2'4,5]THIENO[2,3-C][1,10]PHENANTHROLINE AND NAPHTHO[2',1'4,5]THIENO[2,3-C][1,10]PHENANTHROLINE, Journal of heterocyclic chemistry, 33(1), 1996, pp. 179-183
aphtho[1',2':4,5]thieno[2,3-c][1,10]phenanthroline and phtho[2',1':4,5
]thieno[2,3-c][1,10]phenanthroline, two novel polycyclic heterocyclic
ring systems, have been synthesized in four steps from known starting
materials. The total H-1 nmr spectral assignments were made using a CO
SY experiment to identify the spin systems.