The title compound, 4-[(1
E)-(2,3-dihydroxybenzylidene)amino]-1,5-dimethyl-2-phenyl-2,3-dihydro-1
H-pyrazol-3-one (C
18H
17N
3O
3), was synthesized and its crystal structure was determined by an X-ray method. The crystal belongs to the monoclinic system, space group
P2
1/
c. The cell parameters are:
a = 16.420(3)Å,
b = 7.3608(15)Å,
c = 13.517(3)Å,
β = 103.92(3)°,
V = 1585.8(6)Å
3,
Z = 4, the final
R = 0.0569 and
wR = 0.1306. The molecules are linked by intermolecular O-H…O hydrogen bonds into a
zigzag 1D chain along the
b-axis. Intramolecular O-H…N hydrogen bonds and a π-π stacking interaction were also found. The molecular structure adopts a
trans configuration about the central C=N double bond.
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