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Photo enhancement reveals (E,Z) and (Z,Z) configurations as additional intermediates in iminium ion catalysis

Stockerl, Willibald J. ; Gschwind, Ruth M.


Imidazolidinone-based α,β-unsaturated iminium ions are the reactive species within countless synthetic protocols in asymmetric organocatalysis. However, (E,Z) and (Z,Z) imidazolidinone iminium ions, i.e. (Z)-C[double bond, length as m-dash]C configurations, have been elusive so far. Herein we describe how in situ photoisomerization enables the observation and assignment of high energetic ...


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