Forward masking of the electrically evoked compound action potential in animals with residual hair c

A purification process for 3-phenoxybenzaldehyde, which comprises reacting crude 3-phenoxybenzaldehyde with an alkali metal or ammonium bisulfite, or metabisulfite in the presence of an organic quaternary ammonium salt, an inorganic acid salt of organic tertiary amines, or a macrocyclic polyether used as a catalyst, isolating the resulting 3-phenoxybenzaldehyde alkali metal or ammonium bisulfite adduct, and decomposing it by using an acid or a base, or by heating.