| Abstract: | The enantioselective protio(deuterio)oligomerization of propene, 1-pentene and 4-methyl-1-pentene was carried out with the diastereomerically pure catalyst precursor (?)-(R)-ethylenebis [1–3a,7a-η-(4,5,6,7-tetrahydro-1-indenyl)]zirconium (S)-1,1′-bis-2-naphtholate ( 3 ) and/or with (?)-(R)-ethylene [1–3a,7a-η-bis(4,5,6,7-tetrahydro-1-indenyl]dimethylzirconium ( 1 ) in the presence of methylalumoxanes. The enantioselectivity of both reactions which take place (deuteration and oligomerization) is from fair to high and essentially independent of the catalyst precursor. In the hydrooligomerization the enantioface of the olefinic monomer which prevailingly reacts is from a geometric point of view the same for all three substrates. In the case of 1-pentene and 4-methyl-1-pentene the enantioface prevailing embedded in the oligomers is opposite to that prevailingly deuterated. The significance of the growing chain for enantioface selection during stereospecific polymerization is thus emphasized. |
