The configuration assignment of stereoisomeric carbaldehyde oximes by determination of the UV-absorption of the oxime and oximate forms is also applicable to aromatic aldehyde oximes. While the observation, that the band maximum difference between the Z and Z(−)forms is bigger than between the E and E(−)forms, is not valid in the presence of +I and +R substituents, the molar absorption coefficient ratio ɛE(−)/ɛZ(−)is in any case bigger than one. Bromo, chloro, cyano, methoxy, methyl, and nitro substituted benzaldehyde oximes have been inv