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Updated: Jun 1, 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-(4-Chloro-phen-yl)-5-hydr-oxy-5-phenyl-4,5-dihydro-1H-pyrazol-1-yl](3-pyrid-yl)methanone
Abstract:
In the title compound, C(21)H(16)ClN(3)O(2), the dihedral angles formed by the pyrazole ring with the pyridyl, phenyl-ene and phenyl rings are 6.80 (5), 9.23 (5) and 74.96 (5)°, respectively. The phenyl and phenyl-ene rings are inclined at 80.14 (2)°. Intra-molecular O-H⋯O and C-H⋯N hydrogen bonds generate S(6) ring motifs. The crystal packing is strengthened by short inter-molecular O-H⋯N, C-H⋯O hydrogen bonds and π-π stacking inter-actions with centroid-centroid distances of 3.6247 (5)-3.7205 (5) Å, together with inter-molecular short O⋯N contacts [2.7682 (11) Å]. Mol-ecules are linked into infinite chains along [100].
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