期刊
JOURNAL OF ORGANOMETALLIC CHEMISTRY
卷 741, 期 -, 页码 33-39出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2013.05.020
关键词
N-Heterocyclic carbene; Cobalt; Bulky ligands; Pyridine
资金
- EPSRC
- DFG
The reactivity of cobalt dibromide with the bulky N-heterocyclic carbenes IMes and IPr has been explored [IMes = N,N'-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene; IPr = N,N'-bis(2,6-diisopropylphenyl)imidazol-2-ylidene], with the aim of generating synthetically versatile complexes of the types (NHC)CoBr2 and (NHC)(2)CoBr2. Differences between the two carbene systems illustrate the key role of ligand sterics in this synthetic approach, while the importance of donor strength is emphasized by comparative studies with the related sterically encumbered pyridine ligand 2,6-Mes(2)py. Thus, IMes and IPr are differentiated by the inability of the latter, bulkier, donor to form a 2:1 adduct, while 2,6-Mes(2)py gives rise to Co-N bonds only in the presence of a suitable halide abstraction agent. (C) 2013 Elsevier B.V. All rights reserved.
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