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A new family of highly active ethylene tri-/tetramerization catalysts based on N -phosphinoamidinechromium complexes has been investigated. The 1-hexene to 1-octene molar ratio can be tuned from 140 to 1.5 by varying the steric environment around the chromium center, and product purities are very good to excellent. Precatalyst tridentate coordination effectively shuts down catalytic activity, suggesting that THF abstraction from the chromium center by the Lewis acidic aluminum activator is necessary to achieve an active catalyst system.
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Sydora et al. (2012) studied this question.
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