N,N,N′,N′-Tetramethyl-1,3-propanediamine is an acyclic tertiary amine. It shows the ability to absorb CO2 when dissolved in aqueous solution. N,N,N′,N′-Tetramethyl-1,3-propanediamine (TMPDA) may be used:As a catalyst for the Baylis-Hillman reaction of cycloalkenones. In the preparation of homodimeric asymmetric monomethine cyanine dyes during the bisquaternization process. As a ligand (L) for the preparation of dinuclear μ-carbonato-dicopper(II) species.