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A facile, straightforward protocol was established for diarylannulated sulfide and selenide construction through S-I and Se-I exchange without transition metal assistance. Elemental sulfur and selenium served as the chalcogen source. Diarylannulated sulfides were systematically achieved from a five- to eight-membered ring. A trisulfur radical anion was demonstrated as the initiator for this radical process via electron paramagnetic resonance (EPR) study. OFET molecules 1benzothieno3,2-b1benzothiophene (BTBT) and 1benzothieno3,2-b1benzoselenophene (BTBS) were efficiently established.
Wang et al. (Wed,) studied this question.