New Tetrameric Alkylmetal Boryloxides [(&mgr;(3)-R(2)BO)MR'](4) of Zinc and Cadmium with Heterocubane Structure.
The treatment of diethylzinc with (9-BBN)(2)O afforded a tetrameric species [(&mgr;(3)-9-BBN-9-O)ZnEt](4) (1) in high yield due to the selective cleavage of metal-carbon bond whereas Bu(t)(2)Zn was found to be inert toward (9-BBN)(2)O. The reaction of dimethylcadmium with (9-BBN)(2)O resulted in the formation of the analogue [(&mgr;(3)-9-BBN-9-O)CdMe](4) (2). Reactions of tetraethyldiboroxane Et(4)B(2)O with Et(2)Zn, Bu(t)(2)Zn and Me(2)Cd were also investigated showing its different behavior in each case. The structures of 1 and 2 were determined by X-ray diffraction, and they are the first for group 12 metal boryloxides with a cubane-like M(4)O(4) core. The boron-oxygen interaction affecting deformation of the central core is discussed based on X-ray as well as multinuclear NMR spectroscopy data.
Lulinski
Sergiusz
S
Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland.
Madura
Izabela
I
Serwatowski
Janusz
J
Zachara
Janusz
J