Introduction to 4,4′-Diaminodimethane 4,4′-diaminodimethane (MDA, full name 4,4′-Methylenebis (phenylamine)), is an important organic compound and belongs to the class of aromatic amines in chemical structure. It is connected by two rings through a methylene bridge, each with amino functional groups on it. The molecular formula of MDA is C13H14N2 and the molecular weight is 198.26...