Facile and Regioselective C–H Bond Activation of Aromatic Substrates by an Fe(II) Complex Involving a Spin-Forbidden Pathway
摘要:
The Fe(II) complex Cp*Fe(CO)(NCMe)Ph (Cp* = eta(5)-pentamethylcyclopentadienyl) is shown to mediate facile and highly regioselective C-H activation of aromatic substrates including benzene, furan, thiophene, thiazole, and 2-methylfuran. Experimental and computational evidence suggest a mechanism for C-H activation that involves NCMe dissociation, multiple spin intersystem crossings, C-H bond coordination, and C-H bond cleavage by a sigma-bond metathesis reaction.
Formation of Hydroxyindenyl and Vinylidene Ligands by Reaction of Internal Alkynes with Cp*Fe(CO)(NCMe)Ph
作者:Steven E. Kalman、T. Brent Gunnoe、Michal Sabat
DOI:10.1021/om500748v
日期:2014.10.13
The reactivity of Cp*Fe(CO)(NCMe)Ph (1) (Cp* = pentamethylcyclopentadienyl) with internal alkynes has been studied. Reactions of 1 with dihydrocarbyl-substituted alkynes result in the formation of pentamethylcyclopentadienyl hydroxyindenyl sandwich complexes. A divergent reaction pathway is observed in the case of bis(trimethylsilyl)acetylene, where a neutral Fe vinylidene is isolated. The reactions