The diphenyl-ansa-zirconocene complex 2 adds HB(C6F5)2 at the C![[double bond, length as m-dash]](http://www.rsc.org/images/entities/char_e001.gif)
C double bond of its pendent Cp-allyl functional group to yield 3. During 3 days at room temperature the –B(C6F5)2 group takes part in an electrophilic substitution reaction at the adjacent Cp-ring to form 5 with formation of one equivalent of
