The complex reacts with the highly electrophilic borane HB(C6F5)2 to form a product having stoichiometry and the product is a rare example of pentacoordinate carbon.
a. Suggest a structure for this product.
b. An isomer of this product, [(C5H5)2ZrH]+ [CH2 {B(C6F5)2}2 (μ–H)]-, has been proposed as a potential Ziegler–Natta catalyst. Suggest a mechanism by which this isomer might serve as such a catalyst.
(See R. E. von H. Spence, D. J. Parks, W. E. Piers, M. MacDonald, M. J. Zaworotko, S. J. Rettig, Angew. Chem., Int. Ed. , 1995 , 34 , 1230.)
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