Xj. Song et M. Bochmann, PREPARATION OF (CP-ASTERISK)(C5ME4CH2B(C6F5)(3))ZRPH, A NOVEL ZWITTERIONIC SINGLE-COMPONENT ALKENE POLYMERIZATION CATALYST, Journal of organometallic chemistry, 546, 1997, pp. 597-600
B(C6F5)(3) reacts with the fulvene complex 5):sigma-eta(1)-tetramethyl
fulvene)phenylzirconium (CpFvZrPh) (I) selectively under attack at th
e fulvene-CH2 group to form the highly sensitive zwitterionic complex
(Cp){(C5Me4CH2-B(C6F5)(3)}ZrPh (II). Mixtures of I with either B(C6F5
)(3) or [CPh3][B(C6F5)(4)] are highly active for the polymerisation of
ethene over a wide range of temperatures. (C) 1997 Elsevier Science S
.A.