Abstract
Symmetrical 1:2‐disubstituted diamines derived from 1:2‐diaminoethane, have been prepared by condensing the latter with the appropriate aldehyde and reducing the Schiffs base so formed. The di‐secondary 1:2‐diamines, so obtained, were more closely investigated. With aldehydes, for example, they form 1:2: 3‐substituted tetrahydroimidazoles.

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