Introduction In previous articles it has been shown that 2-methylquinoline (quinal- dine) and 2,3-dimethylquinoxaline are cyclic ketone-acetals of the ammonia ... RECEIVED JULY 15, 1931 PUBLISHED NOVEMBER E, 1931 ... - . system2 because of the ""')C=N- group which is a part of their structure. In conformity with this view both of these compounds have been shown to react with potassium amide, a base of the ammonia system, to form highly colored (red or ...