Piperazine Other names: Hexahydropyrazine Diethylenediamine 1,4-Diethylenediamine Diethyleneimine Formula: C4H10N2 CAS: 110-85-0 Weight: 84,14 g/mol Boiling point: 147,9 °C Melting point: 109,6 °C Density: 1,11 g/cm3