Synthesis, Characterization, and Structure of Cyclopenta[<i>c</i>]thiophenes and Their Manganese Complexes
作者:Chad A. Snyder、John P. Selegue、Nathan C. Tice、Chad E. Wallace、Mark T. Blankenbuehler、Sean Parkin、Keith D. E. Allen、Ryan T. Beck
DOI:10.1021/ja054513n
日期:2005.11.1
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 [Mneta5-1,2-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.