Acta Crystallographica, Section C: Crystal Structure Communications p. o462-o467 (2007)
Update date:2022-07-29
Topics:
Wardell, James L.
Skakle, Janet M. S.
Low, John N.
Glidewell, Christopher
The mol-ecules of methyl 3-(2-nitro-phenyl-hydrazono)-butan-oate, C11H13N3O4, (I), and methyl 3-(2,4-dinitro-phenyl-hydrazono)butanoate, C11H12N4O6, (II), both prepared from methyl 3-oxobutanoate and the corresponding nitro-phenyl-hydrazine, exhibit polarized mol-ecular electronic structures; in each of (I) and (II), the mol-ecules are linked into chains by a single C - H...O hydrogen bond. The mol-ecules of 5-hydroxy-3-methyl-1-phenyl-1H- pyrazole, C10H10N2O, (III), prepared by the reaction of methyl 3-oxobutanoate and phenyl-hydrazine, are linked into chains by a single O - H...N hydrogen bond. The reaction between methyl 3-oxobutanoate and 3-nitro-phenyl-hydrazine yields 5-hydr-oxy-3-methyl-1-(3-nitro-phen-yl)-1H-pyrazole, (IV), which when crystallized from acetone yields 4-isopropyl-idene-3-methyl-1-(3-nitro-phen-yl)- 1H-pyrazol-5(4H)-one, C13H13N3O3, (V). International Union of Crystallography 2007.
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