It has been shown that catalytic reduction of di-(cyanomethyl)-amine and its N-substituted derivative gives piperazine and mono-N-substituted piperazines. The N-acetyl, N-benzoyl, N- carbethoxy, N-diethylcarbamyl, N-methyl, N-ethyl and N-benzyl derivatives of di- (cyanomethy1)-amine (IV) have been prepared and reduced to the corresponding piperazines (V). This constitutes a new synthesis of piperazines which may be valuable in ...