NNNO-Heteroscorpionate nickel (II) and cobalt (II) complexes for ethylene oligomerization: the unprecedented formation of odd carbon number olefins

The unprecedented observation of odd carbon number olefins is reported during nickel- catalyzed ethylene oligomerization. Two complexes based on Co (II) and Ni (II) with novel tetradentate heteroscorpionate ligand have been synthesized and fully characterized. These complexes showed the ability to oligomerize ethylene upon activation with various organoaluminum compounds (Et2AlCl, Et3Al2Cl3, EtAlCl2, MMAO). Ni (II) based catalytic systems were sufficiently more active (up to 1900 kg·mol (Ni)−1·h−1·atm−1) than Co (II) analogs and have been found to be strongly dependent on the activator composition. The use of PPh3 as an additive to catalytic systems resulted in the increase of activity up to 4,150 kg·mol (Ni)−1·h−1·atm−1 and in the alteration of selectivity. All Ni (II) based systems activated with EtAlCl2 produce up to 5 mol. % of odd carbon number olefins; two probable mechanisms for their formation are suggested – metathesis and β-alkyl elimination. © 2020 John Wiley & Sons, Ltd.

Авторы
Zubkevich S.V.1 , Tuskaev V.A.1, 2 , Gagieva S.C.1 , Kayda A.S.1 , Khrustalev V.N. 3, 4 , Pavlov A.A.2 , Zarubin D.N.2 , Bulychev B.M.1
Издательство
John Wiley and Sons Ltd
Номер выпуска
10
Язык
Английский
Статус
Опубликовано
Номер
e5873
Том
34
Год
2020
Организации
  • 1 Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 11, Moscow, 119991, Russian Federation
  • 2 Russian Academy of Sciences, A.N. Nesmeyanov Institute of Organoelement Compounds, Vavilova st. 28, Moscow, 119991, Russian Federation
  • 3 Peoples' Friendship University of Russia (RUDN University), Miklukho-Maklay St., 6, Moscow, 117198, Russian Federation
  • 4 Russian Academy of Sciences, Zelinsky Institute of Organic Chemistry, Leninsky Prospekt 47, Moscow, 119991, Russian Federation
Ключевые слова
cobalt; ethylene oligomerization; heteroscorpionate; nickel; odd carbon number olefins
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