Salicylaldehyde → N,N'-Bis-(2-hydroxybenzyl)-hexamethylenediamine

Participants

Reaction Steps

122.1 g of a bisazomethine prepared from 2 mols of salicylaldehyde and 1 mol of hexamethylenediamine and having a melting point of 72°-73° C. are hydrogenated in 550 ml of isopropanol in an autoclave in the presence of 8 g of Raney nickel at 75° C. and under a pressure of 90 atmospheres. The product crystallises out at room temperature and is dissolved by boiling with the addition of a further 650 ml of isopropanol. The catalyst is filtered off, and N,N'-bis-(2-hydroxybenzyl)hexamethylenediamine crystallises out on cooling.

Provenance & Evidence