On the formation of the [M OH]+ ion in m‐nitrobenzaldoxime. evidence for a cyclohexadiene‐type intermediate ion

In m‐nitrobenzaldoxime a strongly enhanced loss of OH⋅ is observed as compared with the p‐nitro compound. Evidence is presented for a fragmentation mechanism involving the formation of a cyclohexadiene‐type intermediate ion formed by a rearrangement of the hydroxyl hydrogen to the phenyl ring.