Chemicals. The synthesis and properties of the N, N, 2-tri-methyl-1, 3-propanediamine, N, N, 2, 2-tetramethyl-l, 3-propanedi-amine, N, N, N ', N', 2, 2-hexamethyl-1, 3-propanediamine, cis-and trans-2-(dimethylaminomethyl) cyclohexylamine, the 3-dimethyl-aminomethyl-2-