overview of 4,4′-diaminodimethane 4,4′-diaminodiphenylmethane (4,4′-diaminodiphenylmethane, referred to as mda) is an important organic compound with the chemical formula c13h14n2. it is connected by two rings by a methylene group, each with an amino group (-nh2) on each ring. as an intermediate, mda has a wide range of applications in industrial production, especially in the fields...