Ring-Expanded N-Heterocyclic Copper(I) Boryl Complexes: The Structures of [(6-Dipp)CuBcat], [(6-Dipp)CuBneop], and [(6-Dipp)CuBhex] |
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| Authors: | Dawid J Babula Rex S C Charman Thomas H Jerome Dr Thomas M Horsley Downie Dr Mary F Mahon Dr David J Liptrot |
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| Institution: | 1. Department of Chemistry, University of Bath, Bath, BA2 7AY UK
Centre for Sustainable and Circular Technologies, University of Bath, Bath, BA2 7AY UK;2. Department of Chemistry, University of Bath, Bath, BA2 7AY UK |
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| Abstract: | σ-Bond metathesis reactions between (6-Dipp)CuOtBu] (6-Dipp=:C({Dipp}NCH2)2CH2, Dipp=2,6-iPr2−C6H3) and three diboranes gave access to three new copper(I) boryl complexes (6-Dipp)CuBcat], (6-Dipp)CuBneop], and (6-Dipp)CuBhex] (cat=1,2-O2C6H4; neop=(OCH2)2C(CH3)2; hex=OC(CH3)HCH2C(CH3)2O). Whilst (6-Dipp)CuBcat] and (6-Dipp)CuBneop] formed rapidly in toluene, access to (6-Dipp)CuBhex] required heating to 60 °C for days. The complexes were characterised by single-crystal X-ray crystallography which showed in all three cases that the systems were monomers and distorted-linear at the copper atom. The stability of (6-Dipp)CuBneop] was found to be comparable to that of (IPr*)Cu-Bneop] (IPr*=1,3-bis(2,6-(diphenylmethyl)-4-methylphenyl)imidazol-2-ylidene); it persisted in solution for days with no sign of decomposition. (6-Dipp)CuBhex] is a rare crystallographically characterised example of a complex containing a boryl anion supported by the hexylene glycolato ligand. |
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| Keywords: | boron boryl anion carbene ligands copper ring-expanded N-heterocyclic carbene |
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