Department of Chemistry, Drexel Institute of Technology, Philadelphia, Pennsylvania ... Primary aliphatic nitramines have most frequently been prepared by a four-step procedure: (1) acylation of the alkanamine to form the urethan; (2) nitration of the urethan; (3) ammonolysis of the N-nitrourethan to produce the ammonium salt of the nitramine; and (4) acidification of the salt to obtain the N-nitroalkan- amine.2t3 ... Hexane i-CaH,N( N0z)H Hex an e Ether-hexane (2 : 1) ...