CPC C07F 17/00 (2013.01) [C08F 4/65912 (2013.01); C08F 4/65916 (2013.01); C08F 4/65927 (2013.01); C08F 10/06 (2013.01); C08F 110/06 (2013.01); C08F 210/16 (2013.01)] | 24 Claims |
1. A complex of formula (Ia)
wherein:
M is Hf or Zr;
each X is a sigma ligand;
L is:
a bridge of formula —SiR82, where each R8 is independently a C1-C10-hydrocarbyl or C6-C10-aryl group;
or
an alkylene group;
each n is independently 1 or 2;
R1 and R1′ are each independently the same or different and are a linear or branched C1-C6-alkyl group or C6-20 aryl group, wherein at least one of the C(4) or C(4′) phenyl rings is 3,5-dimethyl phenyl or 4-(tert-butyl)-phenyl;
R2 and R2′ are the same or are different and are a CH2—R9 group, with R9 being H or linear or branched C1-6-alkyl group, C3-8 cycloalkyl group, or C6-10 aryl group;
Each R3 is a —CH2—, —CHRx- or C(Rx)2- group, wherein Rx is C1-4 alkyl and where m is 2-6;
R5 is a linear or branched C1-C6-alkyl group, C7-20 arylalkyl, C7-20 alkylaryl group, or C6-C20-aryl group;
R6 is a C(R10)3 group, with R10 being a linear or branched C1-C6 alkyl group; and
R7 and R7′ are H.
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