POLYMERIZATION OF 1-HEXENE BY (CPTIME2)-TI-ASTERISK(MU-ME)B(C6F5)(3)

Polymerization of l-hexene by CpTiMe2(mu-Me)B(C6F5)(3) results in the formation of low yields of high molecular weight polymer at -78 degre es C but higher yields of lower molecular weight material at 0 degrees C and 22 degrees C. H-1 and C-13{H-1} NMR spectra of the atactic poly mers formed at -78 degrees C are consistent with chain initiation via a 1,2-insertion but predominant chain termination via beta-hydrogen el imination largely after a 2,1-misinsertion. In contrast, beta-hydrogen elimination following 1,2-insertion becomes increasingly important at higher temperatures. (C) 1998 Elsevier Science B.V.