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Cyclotrimerization of alkynes catalyzed by a self-supported cyclic tri-nuclear nickel(0) complex with α-diimine ligands

Shen, Lingyi; Zhao, Yanxia; Luo, Qiong; Li, Qian-Shu; Liu, Bin; Redshaw, Carl; Wu, Biao; Yang, Xiao-Juan

Authors

Lingyi Shen

Yanxia Zhao

Qiong Luo

Qian-Shu Li

Bin Liu

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Professor Carl Redshaw C.Redshaw@hull.ac.uk
Professor of Inorganic Materials Chemistry and REF Lead for Chemistry

Biao Wu

Xiao-Juan Yang

Abstract

A cyclic tri-nuclear α-diimine nickel(0) complex [{Ni(μ-LMe-2,4)}3] (2) was synthesized from a “pre-organized”, trimerized trigonal LNiBr2-type precursor [Ni3(μ2-Br)3(μ3-Br)2(LMe-2,4)3]·Br (1; LMe-2,4 = [(2,4-Me2C6H3)NC(Me)]2). In complex 2, the α-diimine ligands not only exhibit the normal N,N′-chelating mode, but they also act as bridges between the Ni atoms through an unusual π-coordination of a C[double bond, length as m-dash]N bond to Ni. Complex 2 is able to catalyze the cyclotrimerization of alkynes to form substituted benzenes in good yield and regio-selectivity for the 1,3,5-isomers, which is found to vary with the nature of the alkyne employed. This complex represents a convenient self-supported nickel(0) catalyst with no need for additional ligands and reducing agent.

Journal Article Type Article
Publication Date Mar 20, 2019
Journal Dalton Transactions
Print ISSN 1477-9226
Electronic ISSN 1477-9234
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 48
Issue 14
Pages 4643-4649
Institution Citation Shen, L., Zhao, Y., Luo, Q., Li, Q., Liu, B., Redshaw, C., …Yang, X. (2019). Cyclotrimerization of alkynes catalyzed by a self-supported cyclic tri-nuclear nickel(0) complex with α-diimine ligands. Dalton transactions : an international journal of inorganic chemistry / RSoC, 48(14), 4643-4649. https://doi.org/10.1039/c9dt00819e
DOI https://doi.org/10.1039/c9dt00819e
Keywords Inorganic Chemistry
Publisher URL https://pubs.rsc.org/en/content/articlelanding/2019/dt/c9dt00819e#!divAbstract