848645-93-2Relevant academic research and scientific papers
NMR evidence for B(C6F5)3 attack on the inward position of a highly hindered meso ansa-zirconocene
Maggioni, Daniela,Beringhelli, Tiziana,D'Alfonso, Giuseppe,Resconi, Luigi
, p. 640 - 646 (2005)
The reaction of the ansa-zirconocene meso-[C2H 4(4,7-Me2Indenyl)2]ZrMe2 with B(C6F5)3 afforded, besides the expected ion pair with outward MeB(C6F5)3- anion, also a minor isomer (molar fraction 0.043) with the bulky methylborate anion in the inward site. 2D 1H EXSY experiments revealed exchange between the two isomers, at T > 320 K, through the migration of the MeB(C 6F5)3- anion between outward and inward sites. The presence of free B(C6F5)3 fastened the exchange, suggesting B(C6F5)3 attack on the zirconium bound methyl ligand of the two ion pairs.
