Abstract
A new method for the assessment of the π-acceptor strength of N-heterocyclic carbenes is presented. The 77Se chemical shifts of the easily available selenium carbene adducts 1·Se–7·Se correlate with the π-acceptor character of the respective carbenes. The observed δ(77Se) values cover a range of almost 800 ppm, with increasing π-acidity leading to a downfield shift of the signal.
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