The amidinoethylation of amino compounds takes place by the addition of amines to the CC double bond of a variety of N,N'-substituted-propenamidines 1. The most nucleophilic amines such as piperidine, morpholine and pyrrolidine add under very smooth conditions. 1 hr reflux in acetonitrile as solvent and without catalyst. Aliphatic amines such as cyclohexylamine and diisopropylamine require more drastic