CATALYSIS BY COMPLEXES .35. ETA-3,ETA-2,ETA-2-DODECA-2(E),6(E),10(Z)-TRIEN-1-YL-NICKEL(II) HEXAFLUOROPHOSPHATE AND HEXAFLUOROANTIMONATE AS HIGHLY-ACTIVE CATALYSTS FOR 1,4-CIS-POLYMERIZATION OF BUTADIENE

By partial protolysis of eta-3, eta-2, eta-3-dodeca-2(Z),6(E),10(Z)-trien-1,12-diylnickel (II) with hexafluorophosphoric and hexafluoroantimonic acid the complexes given in the title were prepared. Structure and coordination of the C-12-chain could be elucidated NMR-spectroscopically and a rapid anti-syn isomerization proceeding already at deep temperature could be proved. In agreement with the reaction mechanism for the allyl nickel complex catalyzed butadience polymerization derived by us both complexes catalyse the 1,4-cis-polymerization with very high activity.