W. Spaleck et al., NEW BRIDGED ZIRCONOCENES FOR OLEFIN POLYMERIZATION - BINUCLEAR AND HYBRID STRUCTURES, Journal of molecular catalysis. A, Chemical, 128(1-3), 1998, pp. 279-287
Four newly synthesized bridged bisindenyl zirconocenes which are deriv
atives of known structures have been tested in polymerizations of liqu
id propylene with methylaluminoxane as cocatalyst. They include two as
ymmetric and two binuclear systems which are suitable for isotactic po
lymerization. Surprising differences from the behavior of similar syst
ems (regiospecificity, chain termination) are found and discussed. (C)
1998 Published by Elsevier Science B.V.