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

Abstract

A cyclic tri-nuclear α-diimine nickel(0) complex [{Ni(μ-L Me-2,4 )} 3 ] (2) was synthesized from a “pre-organized”, trimerized trigonal LNiBr 2 -type precursor [Ni 3 (μ 2 -Br) 3 (μ 3 -Br) 2 (L Me-2,4 ) 3 ]·Br (1; L Me-2,4 = [(2,4-Me 2 C 6 H 3 )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═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.

Citation

Shen, L., Zhao, Y., Luo, Q., Li, Q. S., Liu, B., Redshaw, C., …Yang, X. J. (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, 48(14), 4643-4649. https://doi.org/10.1039/c9dt00819e

• Journal Article Type: Article
• Acceptance Date: Mar 13, 2019
• Online Publication Date: Mar 20, 2019
• Publication Date: Mar 20, 2019
• Deposit Date: Mar 24, 2019
• Publicly Available Date: Nov 19, 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
• DOI: https://doi.org/10.1039/c9dt00819e
• Keywords: Inorganic Chemistry
• Public URL: https://hull-repository.worktribe.com/output/1421269
• Publisher URL: https://pubs.rsc.org/en/content/articlelanding/2019/dt/c9dt00819e#!divAbstract