1960 年 80 巻 6 号 p. 838-839
Phenanthridine-6-carboxaldehyde (I) is inert to benzoin condensation using potassium cyanide but the use of 1, 3-dimethylbenzimidazolium hydroxide (IV) results in formation of phenanthridoin (II). By a similar process, quinoline-2-carboxaldehyde (V) forms quinaldoin (VI).