A practical palladium/N-heterocyclic carbene catalyzed procedure for the mono- and
double-cyanation of aryl halides is described using inexpensive, easy-to-handle and
nontoxic potassium ferrocyanide trihydrate {K4[Fe(CN)6]·3H2O} as the cyanating agent. The reaction does not require an anhydrous solvent, or
the exclusion of air or moisture. A variety of electron-rich and electron-deficient
aryl halides are efficiently converted into their corresponding nitriles and dicarbonitriles.
Key words
cyanation - N-heterocyclic carbene - palladium catalysis - potassium ferrocyanide
- aerobic conditions