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Keywords:

  • acylazolium ions;
  • kinetics;
  • organocatalysis;
  • N-heterocyclic carbenes;
  • ucleophilic additions
Thumbnail image of graphical abstract

1,4 but not 1,2! The reactivity of 1 towards different nucleophiles (deprotonated β-diketones, enamines, and malonodinitrile) was investigated by NMR and kinetic experiments. These investigations proved that C[BOND]C bond formation occurs by a Michael-type 1,4-addition and not by a 1,2-addition and subsequent [3,3]-sigmatropic rearrangement. The first X-ray structure of an α,β-unsaturated acyl azolium salt (1) is also presented.