Schroth, Werner published the artcileDehydration of ureas with dichlorocarbene in the phase transfer method, Computed Properties of 2451-91-4, the publication is Zeitschrift fuer Chemie (1981), 21(1), 25-7, database is CAplus.
Mono- and disubstituted ureas RR1NCONH2 [R = alkyl, R1 = H, alkyl, or Ph; R = R1 = PhCH2; or RR1 = (CH2)4, (CH2)5, oxydiethylene, or (phenylimino) diethylene] were dehydrated by treatment with :CCl2 in the presence of a phase-transfer catalyst, (PhCH2)Et3NCl, to give 20-85% RR1NCN. (CH2)4NCSNH2 was obtained in 45% yield by the addition of H2S to (CH2)4NCN in the presence of an equimolar amount of dry Et3N.
Zeitschrift fuer Chemie 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, Computed Properties of 2451-91-4.
Referemce:
https://en.wikipedia.org/wiki/Amide,
Amide – an overview | ScienceDirect Topics