Portal de Periódicos da CAPES

Determining the π-Acceptor Properties of N-Heterocyclic Carbenes by Measuring the 77 Se NMR Chemical Shifts of Their Selenium Adducts

2013; American Chemical Society; Volume: 32; Issue: 19 Linguagem: Inglês

10.1021/om400858y

1520-6041

Annika Liske, Kathrin Verlinden, Hannes Buhl, Klaus Schaper, Christian Ganter,

Catalytic Cross-Coupling Reactions

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.