FI Catalysts: A Molecular Zeolite for Olefin Polymerization |
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Authors: | Haruyuki Makio Takashi Ochiai Hidetsugu Tanaka Terunori Fujita |
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Abstract: | A bis(phenoxyimine) group 4 transition metal catalyst (now known as FI catalysts) can discern ethylene from a mixture of ethylene and propylene at more than 99% selectivity. Denisty function theory (DFT) calculations revealed a spatially confined reaction site in the transition states of the migratory insertion which is just the right size for an ethylene molecule but too small for a propylene one. The substituents adjacent to the phenoxy‐oxygens are of crucial importance in developing the size/shape‐selectivity. |
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Keywords: | ligand design polymerization size selectivity substituent effects zeolites |
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