Described is a process for preparing 1,2-diaminoethane having the formula ##STR1## where R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are each independently hydrogen, C.sub.1 -C.sub.20 alkyl, C.sub.3 -C.sub.12 cycloalkyl, C.sub.7 -C.sub.15 aralkyl, unsubstituted or substituted aryl or heteroaryl or alternatively, R.sub.1 and R.sub.2 together with the carbon atom form a 3 to 12 member cycloalkyl group, or with a heteroatom form a 3 to 12 member heterocyclic group and R.sub.3 and R.sub.4 together with the nitrogen atom form a 3 to 12 member heterocyclic group, optionally including oxygen, sulfur or phosphorus as a second heteroatom, the process comprising: reacting a preformed Schiff base with a nitroalkane as a neat mixture in the presence of a catalytic amount of an inorganic base to form the 1-nitro-2-aminoethane intermediate, which was then hydrogenated to give 1,2-diaminoethane.
描述了一种制备1,2-二
氨基
乙烷的过程,其
化学式为##STR1##其中R.sub.1、R.sub.2、R.sub.3和R.sub.4分别独立地为氢、C.sub.1-C.sub.20烷基、C.sub.3-C.sub.12环烷基、C.sub.7-C.sub.15芳基烷基、未取代或取代的芳基或杂环芳基,或者R.sub.1和R.sub.2与碳原子一起形成3到12个成员的环烷基基团,或者与杂原子形成3到12个成员的杂环基团,R.sub.3和R.sub.4与氮原子一起形成3到12个成员的杂环基团,可选地包括氧、
硫或
磷作为第二杂原子,该过程包括:将预制的席夫碱与硝基
烷烃在
无机碱的催化剂存在下反应,形成1-硝基-2-
氨基
乙烷中间体,然后将其氢化以得到1,2-二
氨基
乙烷。