Spectral characteristics of sulfur-containing aromatic heterocyclic compounds in the MO LCAO SCF method

Reaction of 3-Arylaminobenzofuro-, 3-Arylaminobenzothieno-, and 3-Arylaminoindolo[2,3-c]pyrylium Salts with Nucleophilic Reagents

“…In continuing research on synthesis and conversions of condensed pyrylium salts [5, 6], we have studied the reactions of 3-arylaminobenzofuro-(1), 3-arylaminobenzothieno-(2), and 3-arylaminoindolo[2,3-c]pyrylium (3) perchlorates with nucleophilic reagents. The parameters of the π-electron Hamiltonian and the resonance integrals are analogous to those assumed for the carbon and nitrogen atoms [9, 10] and the oxygen atom of the furan ring [11], and the thiophene sulfur atom in [12]. The parameters of the π-electron Hamiltonian and the resonance integrals are analogous to those assumed for the carbon and nitrogen atoms [9, 10] and the oxygen atom of the furan ring [11], and the thiophene sulfur atom in [12].…”