title: Synthesis, characterization, and structure of cyclopenta[c]thiophenes and their manganese complexes.
abstract: 1,3-Diaryl-4H-cyclopenta[c]thiophenes are efficiently prepared from 1,2-diaroylcyclopentadienes by use of Lawesson's reagent. eta5-Cyclopenta[c]thienyl complexes, [Mn(eta5-SC7H3-1,3-R2)(CO)3] (R = Me, Ph), are prepared in high yield by ligand substitution reactions of [MnBr(CO)5] with [SnMe3(SC7H3-1,3-R2)]. Alternatively, thiation with P4S10/NaHCO3 converts [Mn{eta5-1,2-C5H3(COR)2)(CO)3] to [Mn(eta5-SC7H3-1,3-R2)(CO)3] (R = Ph, 4-tolyl, 4-MeOC6H4, benzo[2,3-b]thienyl). The molecular structures of complexes with R = Me, Ph show planar eta5-cyclopenta[c]thienyl ligands, with the manganese atom slightly displaced away from the ring-fusion bond.
authors.affiliation: Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055, USA.
authors.forename: Chad A
authors.initials: CA
authors.lastname: Snyder
authors.forename: John P
authors.initials: JP
authors.lastname: Selegue
authors.forename: Nathan C
authors.initials: NC
authors.lastname: Tice
authors.forename: Chad E
authors.initials: CE
authors.lastname: Wallace
authors.forename: Mark T
authors.initials: MT
authors.lastname: Blankenbuehler
authors.forename: Sean
authors.initials: S
authors.lastname: Parkin
authors.forename: Keith D E
authors.initials: KD
authors.lastname: Allen
authors.forename: Ryan T
authors.initials: RT
authors.lastname: Beck