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

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

doi:10.1021/om400858y.s001

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

journal contribution

posted on 2013-10-14, 00:00 authored by Annika Liske, Kathrin Verlinden, Hannes Buhl, Klaus Schaper, Christian Ganter

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.