[H 2 N{B(C 6 F 5 ) 3 } 2 ] - : A New, Remarkably Stable Diborate Anion for Metallocene Polymerization Catalysts

The reaction between NaNH 2 and B(C 6 F 5 ) 3 affords the amidodiborate anion [H 2 N{B(C 6 F 5 ) 3 } 2 ] -, the structure of which shows multiple intramolecular NH···F hydrogen bonding. Reaction with HCl affords [H(OEt 2 ) 2 ][H 2 N{B(C 6 F 5 ) 3 } 2 ], while treatment of zirconocene dimethyls with [CPh 3 ][H 2 N{B(C 6 F 5 ) 3 } 2 ] gives highly active alkene polymerization catalysts.