The reaction of N-(5-halofurfurylidene)-arylamine with different kind of primary amines was found to result in establishment of the relationship indicated by formula (5). For example, reaction of N-(5-bromofurfurylidene)-aniline and m-toluidine gives, not N-(5-m-toluidinofurfurylidene)-aniline hydrobromide but N-(5-anilinofurfurylidene)-m-toluidine hydrobromide. The same compound is obtained even on reacting 1 mole each of 5-bromofurfural, aniline, and m-toluidine.
