N-Aryl-α, α-dichloroalkylarylketimines are formed from N-aryl-alkylarylketimines with N- chloro succinimide in carbon tetrachloride. Reaction of N-1-(2, 2-dichlor-1-arylpropylidene) anilines with sodium methoxide the latter compounds formally involves migration of the notrogen atom from the 1-to the 3-position. The reaction of higher substituted N-aryl-α, α- dichloroalkylarylketimines with sodium methoxide leads mainly to α-chloro-α, β- ...