title: Synthesis of 1,4-dithiins from pentathiepins.
abstract: Fused aromatic and heterocyclic 1,2,3,4,5-pentathiepins react with triphenylphosphine and alkynes bearing electron-withdrawing groups to give the corresponding 1,4-dithiins in high yields. Unsymmetrical alkynes add regioselectively to afford products in agreement with the electron distribution in a proposed reaction intermediate. A mechanism for these reactions is proposed.
authors.affiliation: N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect, 47, 119991 Moscow, Russia.
authors.forename: Stanislav A
authors.initials: SA
authors.lastname: Amelichev
authors.forename: Lidia S
authors.initials: LS
authors.lastname: Konstantinova
authors.forename: Natalia V
authors.initials: NV
authors.lastname: Obruchnikova
authors.forename: Oleg A
authors.initials: OA
authors.lastname: Rakitin
authors.forename: Charles W
authors.initials: CW
authors.lastname: Rees
mesh_terms: D006571:Heterocyclic Compounds / Q000138:chemical synthesis*
chemical_list: D006571:Heterocyclic Compounds