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Zhou Y, Wu H, Xu S, et al. Highly active chromium-based selective ethylene tri-/tetramerization catalysts supported by PNPO phosphazane ligands. Dalton Trans. 2015;44(20):9545-50doi: 10.1039/c5dt00801h.
Zhou, Y., Wu, H., Xu, S., Zhang, X., Shi, M., & Zhang, J. (2015). Highly active chromium-based selective ethylene tri-/tetramerization catalysts supported by PNPO phosphazane ligands. Dalton transactions (Cambridge, England : 2003), 44(20), 9545-50. https://doi.org/10.1039/c5dt00801h
Zhou, Yusheng, et al. "Highly active chromium-based selective ethylene tri-/tetramerization catalysts supported by PNPO phosphazane ligands." Dalton transactions (Cambridge, England : 2003) vol. 44,20 (2015): 9545-50. doi: https://doi.org/10.1039/c5dt00801h
Zhou Y, Wu H, Xu S, Zhang X, Shi M, Zhang J. Highly active chromium-based selective ethylene tri-/tetramerization catalysts supported by PNPO phosphazane ligands. Dalton Trans. 2015 May 28;44(20):9545-50. doi: 10.1039/c5dt00801h. PMID: 25919568.
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Dalton Trans. 2015 May 28;44(20):9545-50. doi: 10.1039/c5dt00801h.

Highly active chromium-based selective ethylene tri-/tetramerization catalysts supported by PNPO phosphazane ligands.

Dalton transactions (Cambridge, England : 2003)

Yusheng Zhou, Hongfei Wu, Sheng Xu, Xuejun Zhang, Min Shi, Jun Zhang

Affiliations

  1. Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry & Molecular Engineering, East China University of Science and Technology, 130 Mei Long Road, Shanghai 200237, China. [email protected].

PMID: 25919568 DOI: 10.1039/c5dt00801h

Abstract

Novel Cr(iii) catalysts supported by PNPO phosphazane ligands of the type Ph2PN(R)P(Ph)OAr have been prepared, all of which, upon activation with MMAO-3A, are highly active in ethylene tri-/tetramerization with considerable selectivity. The effect of ligand substitution on the catalytic performance has been examined. The Cr precatalyst supported by the PNPO phosphazane ligand with an N-cyclohexyl achieved high activity of 316.7 kg (g Cr h(-1))(-1) and a high total selectivity of 85.1% towards valuable 1-hexene (45.7%) and 1-octene (39.4%) using chlorobenzene as the solvent at 35 bar and 40 °C. In methylcyclohexane, the precatalyst supported by [Ph2PN((i)Pr)P(Ph)OPh] exhibited a higher 1-octene selectivity (54.0%) with a considerable activity of 73.3 kg (g Cr h(-1))(-1) at 35 bar and 40 °C. With the fine-tuned ligand backbone, such a PNPO phosphazane-based catalyst system provides a mode for precise understanding of the impact of ligand variations on catalytic performance.

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