Ring-Expanded N-Heterocyclic Copper(I) Boryl Complexes: The Structures of [(6-Dipp)CuBcat], [(6-Dipp)CuBneop], and [(6-Dipp)CuBhex]

Dawid J. Babula, Rex S.C. Charman, Thomas H. Jerome, Thomas M. Horsley Downie, Mary F. Mahon, David J. Liptrot

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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.

Original languageEnglish
Article numbere202300043
JournalEuropean Journal of Inorganic Chemistry
Volume26
Issue number13
Early online date27 Feb 2023
DOIs
Publication statusPublished - 2 May 2023

Bibliographical note

Funding Information:
DJL thanks the Royal Society for the support of a University Research Fellowship. We wish to thank the University of Bath for funding and MC for use of their analytical facilities. 2
Royal Society - URF\R1\1910

Data Availability Statement

The data that support the findings of this study are available in the supplementary material of this article.

Funding

DJL thanks the Royal Society for the support of a University Research Fellowship. We wish to thank the University of Bath for funding and MC for use of their analytical facilities. 2

Keywords

  • boron
  • boryl anion
  • carbene ligands
  • copper
  • ring-expanded N-heterocyclic carbene

ASJC Scopus subject areas

  • Inorganic Chemistry

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