In this study, we have identified a series of zirconium amine bis(phenolate) type catalysts that can be tuned to produce exclusively oligomers of a-Olefins in which dimer (C12) and trimer (C18) account for up to 98% of the total products and a series of hafnium amine bis(phenolate) type catalysts that has superior selectivity of more than 80% for dimers. 1H-NMR spectroscopy revealed that the major olefinic end-groups were terminal vinylidene units accounting to more than 97% of the total end-groups. The pendant amine bond, although a weak bond, plays an important role in maintaining the rates of chain propagation to chain transfer ratio in the oligomerization regime.

Selective a-olefin oligomerization using group IV amine bis(phenolate) catalysts

253rd National Meeting (2017)

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