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Updated: May 20, 2026
![Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F60786.jpg&w=3840&q=50)
Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
3-Methyl-4-[2-(4-nitro-phen-yl)hydrazin-1-yl-idene]-5-oxo-4,5-dihydro-1H-pyrazole-1-carbothio-amide
Abstract:
The asymmetric unit of the title compound, C(11)H(10)N(6)O(3)S, contains two independent mol-ecules, each of which is stabilized by an intra-molecular N-H⋯O hydrogen bond, forming an S(6) ring motif. In one mol-ecule, the pyrazole ring forms a dihedral angle of 10.93 (14)° with the benzene ring. The corresponding dihedral angle in the other mol-ecule is 7.03 (14)°. In the crystal, mol-ecules are linked via pairs of (N,N)-H⋯O bifurcated acceptor bonds which, together with C-H⋯O hydrogen bonds, form sheets parallel to (001).
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The IUPAC and common names of amides are derived from the parent carboxylic acid, by replacing the suffix “oic acid” and “ic acid,” respectively, with “amide.” In the following example, the IUPAC name ethanamide is derived from ethanoic acid, and the common name, acetamide, is obtained from acetic acid.

