报告题目：The cyclopropyl ligand: a prism for the activation of strong and inert bonds

报告人：Prof. Dr. Michel Etienne

 (Université Toulouse III, Paul Sabatier, France)

报告时间：2017年6月15日，下午15:00-16:30

报告地点：独墅湖校区701号楼B501室

报告人简历：

Sept 2015 - : Professor Exceptional class, Université Toulouse III, Paul Sabatier.

Sept 2006 - Aug 2015: Professor 1^st class, Université Toulouse III, Paul Sabatier.

Sept 1999 - Aug 2006 : Professor 2^nd class, Université Paul Sabatier, Toulouse III.

Sept 1990 - Sept 1999 : Chargé de Recherche CNRS 1, LCC, Equipe “SynthonsOrganométalliques: Concepts et Applications”.

1997, Habilitation à Diriger des Recherches, Université Paul Sabatier, Toulouse III.

Sept 1989 - Aug 1990, Postdoctoral Associate, University of North Carolina, Chapel Hill, NC, Etats-Unis ; Prof.J. L. Templeton. NATO fellow.

1988,PhD, Université de Bretagne Occidentale, Brest.

报告摘要：

Cyclopropane and its derivatives exhibit remarkable properties due to, in part, poor orbital overlap in the ring plane. Cyclopropyl complexes of electropositive metals [L_nM(c-C₃H₅)] (M = group 1-5 metal) show unique structural and chemical properties that will be highlighted through three main complementary aspects: (1) because of strong electronic deficiencies, the complexes [L_nM(c-C₃H₅)] often present α-CC agostic distortions¹ the nature of which will be discussed, (2) the complexes [Tp^Me2NbR(c-C₃H₅)(MeCCMe)] activate strong and inert hydrocarbon CH bonds, most prominently that of methane itself,² (3) dicyclopropyl zirconocene [Cp₂Zr(c-C₃H₅)₂] activates a CF bond in fluoropyridines and allows regioselective stoichiometric CC bond formation.³ Both types of reactions rely on the ability to stabilize reactive ƞ²-cyclopropene intermediates [L_nM(ƞ²-c-C₃H₄)] which cleave CH or CF bonds in a unique manner. Structural and mechanistic details will be provided.

References

 1. M. Etienne, A. S. Weller. Chem. Soc. Rev.2014, 43, 242-259.

 2. (a) P. Oulié, C. Dinoi, C. Li, A. Sournia-Saquet, K. Jacob, L. Vendier, M. Etienne. Organometallics2017,36, 53-63. (b) C. Li, C. Dinoi, Y. Coppel, M. Etienne.J. Am. Chem. Soc. 2015,137, 12450-12453.

 3. Unpublished results.

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