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Title: Selectivity Effects on N, N, N′-Cobalt Catalyzed Ethylene Dimerization/Trimerization Dictated through Choice of Aluminoxane Cocatalyst
Authors: Huang, Yongfeng
Zhang, Randi
Liang, Tongling
Hu, Xinquan
Solan, Gregory A.
Sun, Wen-Hua
First Published: 21-Feb-2019
Publisher: American Chemical Society
Citation: Organometallics, 2019, 38(5), pp. 1143-1150
Abstract: The cobalt(II) chloride complexes, [2-(C 7 H 4 N 2 H)-8-(ArN)C 10 H 8 N]CoCl 2 (Ar = 2,6-Me 2 C 6 H 3 Co1; 2,6-Et 2 C 6 H 3 Co2; 2,6-i-Pr 2 C 6 H 3 Co3; 2,4,6-Me 3 C 6 H 2 Co4; 2,6-Et 2 -4-MeC 6 H 2 Co5; 2,4,6-t-Bu 3 C 6 H 2 Co6), have each been prepared by a one-pot template reaction of 2-benzoimidazolyl-5,6,7-trihydroquinolin-8-one with the corresponding aniline in the presence of cobalt dichloride. The molecular structures of the methanol adducts, Co1(HOMe) and Co4(HOMe), reveal distorted octahedral geometries that self-assemble to form networks based on NH···Cl and OH···Cl intermolecular hydrogen bonding interactions. On activation with methylaluminoxane (MAO), all six cobalt complexes catalyzed ethylene dimerization with a high selectivity for 1-butene. By marked contrast, with modified methylaluminoxane (MMAO), products the result of ethylene dimerization and trimerization were observed with a bias toward the C 6 products (up to 49% 1-hexene). In general, the MMAO-promoted oligomerizations display higher catalytic activities with mesityl-containing Co4 the stand-out performer [7.60 × 10 5 g·mol -1 (Co) h -1 at 50 °C].
DOI Link: 10.1021/acs.organomet.8b00924
ISSN: 0276-7333
eISSN: 1520-6041
Embargo on file until: 21-Feb-2020
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2019, American Chemical Society. Deposited with reference to the publisher’s open access archiving policy. (
Description: The file associated with this record is under embargo until 12 months after publication, in accordance with the publisher's self-archiving policy. The full text may be available through the publisher links provided above.
CCDC 1871156 and 1871157 contain the supplementary crystallographic data for this paper. These data can be obtained free of charge via, or by emailing, or by contacting The Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; fax: +44 1223 336033.
Appears in Collections:Published Articles, Dept. of Chemistry

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