Angular-shaped naphthodifurans, naphtho[1,2-b;5,6-b′]- and naphtho[2,1-b;6,5-b′]-difuran: Are they isoelectronic with chrysene?

Article abstract of DOI:10.1039/c2cc31546g

Although angular-shaped naphthodifurans, naphtho[1,2-b;5,6-b′]- and naphtho[2,1-b;6,5-b′]-difuran, are formally isoelectronic with chrysene as their thiophene counterparts, naphtho[1,2-b;5,6-b′]- and naphtho[2,1-b;6,5-b′]-dithiophene, the HOMO energy leve