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Infrared Absorption of the Carbonyl Group of Semicarbazides, Semicarbazones, and Pyrazolecarboxamides
Volume 22, Number 3 (June 1968) Page 167-169
Wang, Tze Seng
The carbonyl frequency in semicarbazides, semicarbazones, and pyrazolecarboxamides is higher than that in ureas. A phenyl group attached to the third nitrogen atom of semicarbazides lowers the carbonyl frequency. A phenyl group substituted on the first nitrogen atom shifts the carbonyl absorption in semicarbazides to a higher frequency region than do alkyl groups.