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Issue 17, 2012
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Hydrotris(3-mesitylpyrazolyl)borato-copper(i) alkyne complexes: synthesis, structural characterization and rationalization of their activities as alkyne cyclopropenation catalysts

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Abstract

The use of the bulky hydrotris(3-mesitylpyrazolyl)borate anionic ligand has allowed the synthesis of stable TpMsCu(alkyne) complexes (alkyne = 1-hexyne, 1, phenylacetylene, 2, and ethyl propiolate, 3). The spectroscopic and structural features of these compounds and their relative reactivity have been examined, indicating the existence of a low π back-bonding from the copper(I) centre to the alkyne. Ligand exchange experiments have shown that terminal alkyne adducts are more stable than internal alkyne analogues. In good accordance with this, the previously reported alkyne cyclopropenation reaction catalysed by the TpxCu complexes can be rationalized and correlated with their relative stability.

Graphical abstract: Hydrotris(3-mesitylpyrazolyl)borato-copper(i) alkyne complexes: synthesis, structural characterization and rationalization of their activities as alkyne cyclopropenation catalysts

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Publication details

The article was received on 16 Oct 2011, accepted on 16 Jan 2012 and first published on 02 Mar 2012


Article type: Paper
DOI: 10.1039/C2DT11951J
Dalton Trans., 2012,41, 5319-5325

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    Hydrotris(3-mesitylpyrazolyl)borato-copper(I) alkyne complexes: synthesis, structural characterization and rationalization of their activities as alkyne cyclopropenation catalysts

    C. Martín, M. Sierra, E. Alvarez, T. R. Belderrain and P. J. Pérez, Dalton Trans., 2012, 41, 5319
    DOI: 10.1039/C2DT11951J

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