Stable N-Heterocyclic Carbenes with the N,N′-Diarylquinazolin-4-one Backbone: Improved Synthesis, Electronic Properties, and Reactivity
J. Maurice Pütz,
Simone T. Hauer,
Joscha Nellesen
et al.
Abstract:We present a new pathway toward cationic N,N′-diaryl-substituted quinazolin-4-one derivatives,
which act as precursors for the synthesis of new N,N′-diaryl-amino-amido carbenes 5a,b that are stable under inert conditions. A tetrafluoro analogue 5c withstands isolation but can be prepared and employed in
situ. The new NHCs exhibit a strong σ-donor capacity as well
as strong π-accepting properties according to NMR and IR spectroscopic
investigations indicated by the coupling constants 1
J
C,H (210–214 Hz) and 77… Show more
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