Conformations of Monosubstituted and Disubstituted 3,4′-,3,3′- and 4,4′-Diquinolinyl Sulfides Studied by NMR Spectroscopy

Abstract

3′,4-Disubstituted 3,4′-diquinolinyl sulfides 1 exibit nontypical and unexpected spectral properties manifested mainly in proton NMR spectroscopy being results of different conformations at a central sulfide bridge¹. To complete studies on steric structure-spectral properties relationship in diquinolinyl sulfides several 4,4′-disubstituted-3,3′-diquinolinyl sulfides 2 and 3-mono- and 3,3′-disubstituted 4,4′-diquinolinyl sulfides 3 were synthesized and investigated by proton and carbon NMR spectroscopy.