Imidazolium salts. Dissociation processes in N-phenacylimidazolium salts in nonaqueous media

The state of N-phenacylimidazolium salts with various anions (Cl/sup -/, Br/sup -/, No/sub 3//sup -/, ClO/sub 4//sup -/, B(C/sub 6/H/sub 5/)/sub 4//sup -/) in trideuteroacetonitrile was studied by /sup 1/H NMR spectroscopy. The most sensitive to dissociation processes are the protons at the second position of the imidazolium cation and in the methylene group. The chemical shifts of the ions and ion pairs and the dissociation constants of the investigated compounds were determined from the concentration dependence of the observed chemical shifts.