AbstractIn the autoxidation of 1‐piperidinocyclohex‐1‐ene (1), 1‐piperidinobut‐1‐ene (2), 3‐piperidinopent‐2‐ene (3), and 1‐piperidino‐2‐methyl‐prop‐1‐ene(4) only products of an oxidative attack at the CC‐double bond are formed.Both α‐aminoketones, the products of the rearrangement of primarily formed epoxides, and products of the oxidative session of the CC double bond are obtained. As a side reaction some hydrolysis of the starting enamines takes place. This hydrolysis proves that some water must