There are certain objections to a compound having a carbonyl group directly attached to the nitrogen atom2 However, the whole problem is provided with a theoretical basis by the calculations of Kincaid and Henriques3 and the synthesis of more suitable derivatives is now being investigated.
[Yamamoto, Shunzo; Kanetsuki, Akihide; Sueishi, Yoshimi; Nishimura, Norio Bulletin of the Chemical Society of Japan, 1990 , vol. 63, # 10 p. 2911 - 2915]
