Nickel(II) complexes with sterically hindered 5, 6, 7‐trihydroquinoline derivatives selectively dimerizing ethylene to 1‐butene. (19th January 2022)

• Record Type: Journal Article
• Authors: Lin, Wenhua; Liu, Ming; Xu, Lei; Ma, Yanping; Zhang, Liping; Flisak, Zygmunt; Hu, Xinquan; Liang, Tongling; Sun, Wen‐Hua
• Is Part Of: Applied organometallic chemistry. Volume 36:Number 4(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-01-19
• Subjects: ethylene dimerization -- nickel complex -- selectivity -- steric effect; Organometallic chemistry -- Periodicals; Organometallic compounds -- Periodicals; 547.05
• DOI: 10.1002/aoc.6596
• Languages: English
• ISSNs: 0268-2605

Abstract

Abstract: A series of nickel complexes bearing N, N ‐bidentate ligands has been synthesized and characterized by elemental analysis and infrared (IR) spectroscopy. High ethylene dimerization activity, reaching 2.43 × 10 6 g mol −1 (Ni)h −1, was achieved by using these complexes as precatalysts activated with Me2 AlCl. Moreover, the selectivity to obtain α‐C4 was high (93%–96%). Comparing with the previous report by our group, the higher activity and selectivity may be attributed to the substituent at the 2‐position within the ligand, creating the steric hindrance around the metal atom. Abstract : A series of nickel complexes bearing bidentate ligands was synthesized and characterized. These complexes subjected to Me2 AlCl as a cocatalyst efficiently catalyze ethylene oligomerization with high activity (up to 2.42 × 10 6 g mol −1 h −1 ) and selectivity toward α‐C4 (up to 98%). Long lifetime of the active species (0.73 × 10 6 g mol −1 h −1, 180 min) and the first‐order reaction with respect to ethylene were observed.