Decomposes slightly when distd at atmospheric pressure, with the formation of conducting impurities. Fractional distn at about 12mm pressure is satisfactory. After distn, amine (CAS NO. ) was further purified by repeated washing with ether and crystn from EtOH (at low temperature).

After fractional distn in the absence of CO₂, it was twice crystd by cooling, followed by distn. It can be dried by azeotropic distn with dry *benzene.