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Lookup NU author(s): Professor William Clegg, Dr Luca Russo
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Numerous organic transformations rely on organozinc compounds made through salt-metathesis (exchange) reactions from organolithium or Grignard reagents with a suitable zinc precursor. By combining X-ray crystallography, NMR spectroscopy and DFT calculations, this study sheds new light on the constitution of the organometallic species involved in this important synthetic tool. Investigations into the metathesis reactions of equimolar amounts of Grignard reagents (RMgX) and ZnCl2 in THF led to the isolation of novel magnesium-zinc hybrids, [{(thf)(2)(mu-Cl)(3)ZnR}(2)] (R = Et, tBu, nBu or o-OMe-C6H4), which exhibit an unprecedented structural motif in mixed magnesium-zinc chemistry. Furthermore, theoretical modelling of the reaction of EtMgCl with ZnCl2 reveals that formation of the mixed-metal compound is thermodynamically preferred to that of the expected homometallic products, RZnCl and MgCl2. This study also assesses the alkylating ability of hybrid 3 towards the sensitive ketone trifluoroacetophenone, revealing a dramatic increase in the chemoselectivity of the reaction when LiCl is introduced as an additive. This observation, combined with recent related breakthroughs in synthesis, points towards the existence of a trilateral Li/Mg/Zn synergistic effect.
Author(s): Armstrong DR, Clegg W, Garcia-Alvarez P, Kennedy AR, McCall MD, Russo L, Hevia E
Publication type: Article
Publication status: Published
Journal: Chemistry: A European Journal
Year: 2011
Volume: 17
Issue: 30
Pages: 8333-8341
Print publication date: 07/06/2011
ISSN (print): 0947-6539
ISSN (electronic): 1521-3765
Publisher: Wiley - V C H Verlag GmbH & Co. KGaA
URL: http://dx.doi.org/10.1002/chem.201100866
DOI: 10.1002/chem.201100866
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