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First Example of a Bis(dicarbollide) Metallacarborane Containing a B,C'-Heteronuclear Bridge
Clara Viñas1, Josefina Pedrajas, Francesc Teixidor
1Institut de Ciencia de Materials, CSIC, Campus UAB, 08193 Bellaterra, Spain, Department of Chemistry, Box 55, University of Helsinki, FIN-00014, Finland, Department of Chemistry, University of Turku, FIN-20500 Turku, Finland, and Department of Chemistry, Heriot-Watt University, Edinburgh EH14 4AS, U.K.
Abstract:
The first example of B,C'-bridging in the commo bis(dicarbollide) series are presented. The sandwich metallacarborane synthesized is neutral due to the formation of a sulfonium group bridging one carbon from one half and one boron from the second half to yield [1',8-&mgr;-SEt-3,3'-Co(1-Ph-2-SEt-1,2-C(2)B(9)H(9))(9'-Ph-1',9'-C(2)B(9)H(8))]. A nucleophilic substitution is involved to account for its formation. A rearrangement from 3,1,2-CoC(2)B(9) to 3,1,9-CoC(2)B(9) has taken place. The molecular structure is proven by an X-ray analysis.