The mol­ecule of the title compound, C11H14N2O3, adopts a trans configuration with respect to the C=N bond. The dihedral angle between the benzene ring and the hydrazinecarboxyl­ate plane is 12.06 (9)°. Mol­ecules are linked into a one-dimensional network by N—H⋯O hydrogen bonds and C—H⋯π inter­actions. The benzene rings of inversion-related mol­ecules are stacked with their centroids separated by 3.777 (1) A, indicating π–π inter­actions.

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(E)-Ethyl N′-[1-(4-methoxy­phen­yl)ethyl­idene]hydrazinecarboxyl­ate

In the title compound, C9H10N2O3, the hydroxy group and the C=N—N unit are coplanar with the benzene ring. The benzene rings of inversion-related mol­ecules are stacked with their centroids separated by a distance of 3.7703 (9) A, indicating weak π–π inter­actions. In the crystal structure, C—H⋯O, O—H⋯O, N—H⋯O and C—H⋯O hydrogen bonds link molecules into a infinite two-dimensional network along the a axis.

/pdf/e-methyl-n-4-hydroxy-benzyl-idene-hydrazinecarboxyl-ate-30vqdnh8cb.pdf

(E)-Methyl N′-(4-hydroxy­benzyl­idene)hydrazinecarboxyl­ate

The mol­ecule of the title compound, C10H12N2O3, adopts a trans configuration with respect to the C=N bond. The dihedral angle between the benzene ring and the hydrazinecarboxyl­ate plane is 14.6 (1)°. Mol­ecules are linked into a three-dimensional network by O—H⋯O, N—H⋯O and C—H⋯O hydrogen bonds, and by C—H⋯π inter­actions.

/pdf/ethyl-n-e-4-hydroxy-benzyl-idene-hydrazinecarboxyl-ate-at-83fy08k4ac.pdf

Ethyl N'-[(E)-4-hydroxy-benzyl-idene]hydrazinecarboxyl-ate at 123 K.

The title compound, C10H11BrN2O2, crystallizes with two independent mol­ecules in the asymmetric unit, in which the dihedral angles between the benzene ring and the hydrazine carboxylic acid mean plane are 3.0 (4) and 45.3 (3)°. The mol­ecules are linked into a one-dimensional network by inter­molecular N—H⋯O hydrogen bonds.

/pdf/e-ethyl-n-4-bromo-benzyl-idene-hydrazinecarboxyl-ate-5ebs034uea.pdf

(E)-Ethyl N'-(4-bromo-benzyl-idene)hydrazinecarboxyl-ate.

The title compound, C10H12N2O4, adopts a trans configuration with respect to the C=N double bond. The non-H atoms of the mol­ecule are essentially coplanar, with a maximum deviation of 0.015 (2) A. An intra­molecular O—H⋯N inter­action is observed. In the crystal structure, the mol­ecules are linked into a two-dimensional network parallel to the ac plane by N—H⋯O hydrogen bonds involving the meth­oxy O atom and by two C—H⋯O hydrogen bonds involving the carbonyl O atom. In addition, an intermolecular C—H⋯π inter­action is observed.

https://journals.iucr.org/e/issues/2009/07/00/ci2816/ci2816.pdf

(E)-Methyl N'-(2-hydr-oxy-3-methoxy-benzyl-idene)hydrazinecarboxyl-ate.

There are two mol­ecules in the asymmetric unit of the title compound, C10H12N2O3, with almost identical conformations. The crystal structure is stabilized by inter­molecular N—H⋯O hydrogen bonds.

Yue Ding

Papers

N′-(4-Methoxybenzylidene)methoxyformohydrazide