Methyl acetoacetate at 150 K

Redetermination of 3-methyl­isoquinoline at 150 K

The structure of the title compound, C(19)H(9)O, has been redetermined at 150 K. The redetermination is of significantly higher precision than a previous room-temperature structure [Ribar et al. (1974 ▶). Cryst. Struct. Commun.3, 323-325]. The C-N bond lengths for this redetermination are much closer to those observed in comparable structures, and the orientation of the methyl group with respec...

William Osler at 150.

(E)-Methyl N′-(4-bromo­benzyl­idene)­hydrazinecarboxyl­ate at 123 K

The title compound, C(9)H(9)BrN(2)O(2), crystallizes with two independent but essentially identical mol-ecules in the asymmetric unit. Each mol-ecule adopts a trans configuration with respect to the C=N bond. In one of the mol-ecules, the dihedral angle between the benzene ring and the hydrazinecarboxylic acid plane is 24.9 (2)°, and that in the other mol-ecule is 16.1 (2)°. The mol-ecules are ...

(E)-Methyl 2-[4-(dimethyl­amino)benzyl­idene]hydrazinecarboxyl­ate at 123 K

The approximately planar molecule of the title compound, C(11)H(15)N(3)O(2), is in an E configuration with respect to the N=C double bond. An inter-molecular N-H⋯O hydrogen bond links the mol-ecules into a one-dimensional chain propagating in the [010] direction.

(E)-Methyl N′-(2-hydroxy­benzyl­idene)­hydrazinecarboxyl­ate at 123 K

In the title mol-ecule, C(9)H(10)N(2)O(3), the hydrazinecarboxylic acid mean plane and the benzene ring form a dihedral angle of 11.1 (1)°. In the crystal structure, inter-molecular N-H⋯O hydrogen bonds link the mol-ecules into chains extending along the b axis. An intra-molecular O-H⋯N hydrogen bond is also present.