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

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

doi:10.1039/c9dt00819e

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

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

^*Corresponding author for this work

Northwest University China
South China Normal University
University of Hull

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

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.

Original language	English
Pages (from-to)	4643-4649
Number of pages	7
Journal	Dalton Transactions
Volume	48
Issue number	14
DOIs	https://doi.org/10.1039/c9dt00819e
Publication status	Published - 2019
Externally published	Yes

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@article{b6d43611123d463f851ac2b72162424d,

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

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.",

author = "Lingyi Shen and Yanxia Zhao and Qiong Luo and Li, \{Qian Shu\} and Bin Liu and Carl Redshaw and Biao Wu and Yang, \{Xiao Juan\}",

note = "Publisher Copyright: {\textcopyright} The Royal Society of Chemistry.",

year = "2019",

doi = "10.1039/c9dt00819e",

language = "English",

volume = "48",

pages = "4643--4649",

journal = "Dalton Transactions",

issn = "1477-9226",

publisher = "Royal Society of Chemistry",

number = "14",

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TY - JOUR

T1 - Cyclotrimerization of alkynes catalyzed by a self-supported cyclic tri-nuclear nickel(0) complex with α-diimine ligands

AU - Shen, Lingyi

AU - Zhao, Yanxia

AU - Luo, Qiong

AU - Li, Qian Shu

AU - Liu, Bin

AU - Redshaw, Carl

AU - Wu, Biao

AU - Yang, Xiao Juan

PY - 2019

Y1 - 2019

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/85063743146

U2 - 10.1039/c9dt00819e

DO - 10.1039/c9dt00819e

M3 - Article

C2 - 30892326

AN - SCOPUS:85063743146

SN - 1477-9226

VL - 48

SP - 4643

EP - 4649

JO - Dalton Transactions

JF - Dalton Transactions

IS - 14

ER -

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

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