In contrast to the well-developed chemistry of cyclopentadienyl ligands (Cp) and their complexes, the coordination chemistry of the related pyrrolyl ligands (Pyr) is underdeveloped. First reportet by Kuhn in 1991, the sterically demanding 2,5-di-tert-butyl-pyrrolyl (PyrtBu2) was found to react as a Cp-analogue and to bind in a ?5-fashion forming diaza-metallocenes of Fe, Co, Ni, Sn and Pb.[1]We have recently begun to explore the coordination and reaction chemistry of sterically demanding pyrrolyl ligands with 3d-transition metals. The possibility to switch between ?5- and ?1-coordination has been established with Cr(II) centers. These and other results will be presented.[1] a.) N. Kuhn, K. Jendral, R. Boese, D. Bl�ser, Chem. Ber. 1991  , 124, 89-91. b.) N. Kuhn, M. K�ckerling, S. Stubenrauch, D. Bl�ser, R. Boese, J. Chem. Soc., Chem. Commun. 1991  , 1368-1370. c.) N. Kuhn, G. Henkel, J. Kreutzberg, S. Stubenrauch, J. Organomet. Chem. 1993  , 456, 97-106. d.) N. Kuhn, G. Henkel, S. Stubenrauch, J. Chem. Soc., Chem. Commun. 1992  , 760. e.) N. Kuhn, G. Henkel, S. Stubenrauch, Angew. Chem. 1992  , 104, 766-768.

Sterically demanding pyrrolyl ligands: Synthesis and coordination chemistry

244th National Meeting (2012)

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