Delafuente, D. A.; Myers, W. H.; Sabat, M.; Harman, W. D. Tungsten(0) 2-Thiophene Complexes: Dearomatization of Thiophene and Its Facile Oxidation, Protonation, and Hydrogenation. Organometallics 2005, 24, 1876-1885.
Abstract
Complexes of the form TpW(NO)(PMe3)(η2-thiophene) have been synthesized in 31−40% yield by reduction of TpW(NO)(PMe3)(Br) in the presence of the thiophene ligand. The dynamics of protonation and the subsequent deprotonation for the corresponding 2H-thiophenium complexes have been investigated. Hydrogenation of the uncoordinated double bond was accomplished, and sulfur−carbon, sulfur−oxygen, and carbon−carbon bond-forming reactions were explored with these complexes.
