A rational approach towards selective ethylene oligomerization via PNP-ligand design with an N-triptycene functionality

Samir Barman*, E. A. Jaseer*, Nestor Garcia, Mohamed Elanany, Motaz Khawaji, Wei Xu, Sibo Lin, Hassan Alasiri, Muhammad Naseem Akhtar, Rajesh Theravalappil

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Novel PNP ligands bearing an N-triptycene backbone were developed and evaluated for selective ethylene oligomerization. Upon activation with MMAO-3A, the pre-catalyst mixture containing Cr(acac)3/ligand efficiently promotes ethylene tetramerization with remarkably high productivities (up to 1733 kg gCr−1 h−1) and C8 olefin selectivities (up to 74.1 wt%). More importantly, ligands with a PNP moiety connecting at the 1- or 1,4-position of the triptycene molecule could achieve exceptionally high alpha (1-C6 + 1-C8) selectivities, exceeding 90 wt%, as a result of high 1-C6 purity (>90 wt%) in the C6 fraction. Based on comparative catalytic studies employing various PNP ligands with or without an N-triptycene backbone, we illustrate the fact that a rational design of PNP ligands with an optimum degree of steric profile around the N-center could provide C6 cyclics controlled highly α-selective ethylene oligomerization.

Original languageEnglish
Pages (from-to)10044-10047
Number of pages4
JournalChemical Communications
Volume58
Issue number72
DOIs
StatePublished - 12 Aug 2022

Bibliographical note

Publisher Copyright:
© 2022 The Royal Society of Chemistry.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Metals and Alloys
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • General Chemistry
  • Catalysis

Fingerprint

Dive into the research topics of 'A rational approach towards selective ethylene oligomerization via PNP-ligand design with an N-triptycene functionality'. Together they form a unique fingerprint.

Cite this