| http://www.w3.org/ns/prov#value | - The Schiff's bases of general formula II are conveniently obtained by reacting a diamine of formula III with an aldehyde of the formula ##STR10## The reaction is conveniently carried out in an inert gas atmosphere at a temperature which lies between 20??? C. and the boiling temperature of the solvent, for example of ethanol, toluene or dichloromethane.
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