Tuesday, 24 May 2005

This presentation is part of: Graduate Posters

Cooperative binding of 1,2 substituted ferrocene based bidentate Lewis acids

R. Boshra1, JA Gamboa1, A Sundararaman1, F. Jakle1, Arnold L. Rheingold2, and Lev Zakharov2. (1) Rutgers Univ., Newark, NY, (2) University of California at San Diego, La Jolla, CA

Lewis acids have been the subject of much recent academic and commercial research. Driven by the need for asymmetric and enantioselective synthesis, researchers have focused their efforts towards the development of new stereo- and regio-selective catalysts.

In particular, hetero nuclear bidentate Lewis acids present new opportunities in asymmetric catalysis as well as anion and neutral ligands recognition. A practical way for the synthesis of planar chiral hetero nuclear ferrocene-based bidentate Lewis acids has been developed by our group. Our model compound displays both boron and tin centers occupying the 1,2 positions of one of the cyclopentadienyl (Cp) rings. Single crystal x-ray diffraction and multinuclear NMR studies revealed significant interactions between both metal centers. Coordination of halide and neutral ligands to both acid centers will be discussed. Thermodynamic parameters pertaining to the rotational barrier of the Cp-B bond before and after nucleophile binding have also been obtained

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