The larger pert of this section is devoted to a preliminary survey of simple diacylimines. Karrer's Lehrbuch der Organischen Chemie provided the first incentive towards the investigation of this class of compounds with the words : \Es mind such sekundare und tertiare Saureamide bekannt die aber weniger Interesse besitzen\". Relatively few compounds of this class have been described and even fewer were studied systematically from a chemical point of view particularly during the last 30 years. The well known technical difficulties of the Gabriel synthesis of primary amines have led the author to consider variations of the method involving secondary amides (diacylimines) other than phthalimide. The first investigations arising from these considerations are reported in this section but it will be seen that the original problem leading to these investigations has received little attention so far."
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