In terms of quantities produced, 1,6-diaminohexane (a precursor to Nylon 6-6) is most important, followed by ethylenediamine.
In the context of chemical production, 1,6-diaminohexane plays a vital role as a precursor to Nylon 6-6. It is the primary chemical in terms of quantity manufactured, with ethylenediamine being the second most significant.