Overhaul of the reducing ability of Breslow-type derivatives and implications for carbene-catalyzed radical reactions. - Archive ouverte HAL Access content directly
Preprints, Working Papers, ... Year : 2021

Overhaul of the reducing ability of Breslow-type derivatives and implications for carbene-catalyzed radical reactions.

Ludivine Delfau
  • Function : Author
Samantha Nichilo
  • Function : Author
Florian Molton
  • Function : Author
Julie Broggi
  • Function : Author
Eder Tomás-Mendivil

Abstract

We report the synthesis of acyl azolium salts stemming from thiazolylidenes CNS, triazolylidenes CTN, mesoionic carbenes CMIC and the generation of their corresponding radicals and enolates, covering about 60 Breslow-type derivatives. This study highlights the role of additives in the redox behavior of these compounds and unveils several critical misconceptions about radical transformations of aldehyde derivatives under N-heterocyclic carbene catalysis. In particular, the reducing ability of enolates has been dramatically underestimated in the case of biomimetic CNS. In contrast with previous electrochemical studies, we show that these catalytic intermediates can transfer electrons to iodobenzene within minutes at room temperature. Enols derived from CMIC are not the previously claimed super electron donors, although enolate derivatives of CNS and CMIC are powerful reducing agents.
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Dates and versions

hal-03357777 , version 1 (29-09-2021)

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Ludivine Delfau, Samantha Nichilo, Florian Molton, Julie Broggi, Eder Tomás-Mendivil, et al.. Overhaul of the reducing ability of Breslow-type derivatives and implications for carbene-catalyzed radical reactions.. 2021. ⟨hal-03357777⟩
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