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., Wu, B., & 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
• Contract Date: Mar 25, 2019