Tungsten(0) and Rhenium(I) η2-Pyrrole Complexes:  Dearomatization of Pyrroles and Their Facile Isomerizations, Protonations, and Reductions

Autor: Myers, W. H., Welch, K. D., Graham, P. M., Keller, A., Sabat, M., Trindle, C. O., Harman, W. D.
Zdroj: Organometallics; October 2005, Vol. 24 Issue: 22 p5267-5279, 13p
Abstrakt: Complexes of the form TpRe(CO)(MeIm)(η2-L) and TpW(NO)(PMe3)(η2-L) have been synthesized, where L = 1-methylpyrrole, 2-methylpyrrole, and 2,5-dimethylpyrrole. Depending on the nature of both the pyrrole and the metal, either a η2-1H- or an η2-3H-pyrrole complex can be isolated. In contrast, for the parent pyrrole, oxidative addition occurs across the N−H bond, generating either a N-pyrrolyl or N-pyrrolyl hydride. The protonation or methylation of the η2-pyrrole complexes and the reduction of the resulting pyrrolium species have also been investigated.
Databáze: Supplemental Index