Schroth, W. published the artcileThe dehydration of ureas by two-phase dichlorocarbene reaction, a synthetic access to substituted cyanamides, Category: amides-buliding-blocks, the publication is Journal fuer Praktische Chemie (Leipzig) (1983), 325(5), 787-802, database is CAplus.
A wide variety of N,N-disubstituted ureas were dehydrated in the CHCl3/NaOH catalytic 2-phase system under mild conditions. The sequence of urea transamidation and dehydration offers a profitable approach to aprotic cyanamides. Among various phase-transfer catalysts tertiary amines prove to be the most efficient. Tertiary amines may also be used in the transformation of carboxamides and thioamides to the corresponding nitriles. The application of the same technique is less suitable in the case of N-monosubstituted ureas, N,N‘-disubstituted ureas, and N-(dialkylaminomethylene)ureas, since subsequent reactions of the cyanamides predominate. The dehydration mechanism is elucidated in terms of HOMO-perturbation theory.
Journal fuer Praktische Chemie (Leipzig) published new progress about 2451-91-4. 2451-91-4 belongs to amides-buliding-blocks, auxiliary class Nitrile,Amine,Benzene, name is N,N-Dibenzylcyanamide, and the molecular formula is C15H14N2, Category: amides-buliding-blocks.
Referemce:
https://en.wikipedia.org/wiki/Amide,
Amide – an overview | ScienceDirect Topics