What can NMR spectroscopy of selenoureas and phosphinidenes teach us about the π-accepting abilities of N-heterocyclic carbenes?

by Vummaleti, Sai V. C., Nelson, David J., Poater, Albert, Gómez-Suárez, Adrián, Cordes, David B., Slawin, Alexandra M. Z., Nolan, Steven P., Cavallo, Luigi
Published in Chem Sci (2015)