Mechanism of the catalytic carboxylation of alkylboronates with CO2 using Ni-NHC complexes: a DFT study

Maicon Delarmelina, Enrico Marelli, Jose Carneiro, Steven Nolan, Michael Buehl

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12 Citations (Scopus)
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Abstract

A new mechanism is proposed for the Ni-catalysed carboxylation of organoboronates with CO2. DFT investigations at the PBE0-D3 level have shown that direct CO2 addition to the catalysts [Ni(NHC)(Allyl)Cl] (1NHC, NHC = IMe, IPr, SIPr and IPr*) is kinetically disfavored and formation of the Aresta-type intermediate is unlikely to occur. According to the mechanism proposed here, the carboxylation process starts with addition of the borate species to 1NHC, followed by transmetalation, CO2 cycloaddition and carboxylation. The rate-determining step was identified as being the transmetalation process, with computed relative free energy barriers of 34.8, 36.8 and 33.5 kcal mol-1 for 1IPr, 1SIPr and 1IPr*, respectively
Original languageEnglish
Pages (from-to)14954-14961
JournalChemistry - A European Journal
Volume23
Issue number59
Early online date26 Sept 2017
DOIs
Publication statusPublished - 20 Oct 2017

Keywords

  • Carbene ligands
  • Nickel
  • N-Heterocyclic carbene
  • Carbon dioxide
  • Carboxylation
  • DFT

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