A solid colourless amine, H₂N(CH₂)₆NH₂; m.p. 41°C; b.p. 204°C. It is made by oxidizing cyclohexane to hexanedioic acid, reacting this with ammonia to give the ammonium salt, and dehydrating the salt to give hexanedionitrile (NC(CH₂)₆CN). This is reduced with hydrogen to the diamine. The compound is used, with hexanedioic acid, for producing nylon 6,6.