Selective mono- and dimetallation of a group 3 sandwich complex

Martínez-Martínez, Antonio J. and Kennedy, Alan R. and Paprocki, Valerie and Fantuzzi, Felipe and Dewhurst, Rian D. and O'Hara, Charles T. and Braunschweig, Holger and Mulvey, Robert E. (2019) Selective mono- and dimetallation of a group 3 sandwich complex. Chemical Communications, 55 (65). pp. 9677-9680. ISSN 1359-7345

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    Abstract

    The scandium Cp/COT hybrid sandwich compound [(η 5-C 5H 5)Sc(η 8-C 8H 8)] is resistant to metallation via conventional alkyllithium and lithium amide bases. In this work, clean, selective, stoichiometric and high-yielding mono- and dimetallation is accomplished using tandem trans-metal-trapping (TMT) involving LiTMP and iBu 2AlTMP with deprotonation occurring selectively at the Cp and Cp/COT rings respectively, providing the first examples of selective metallation of a sandwich complex featuring a group 3 element.