N-(2-Chloro­eth­yl)morpholine-4-carbox­amide

The title compound, C₇H₁₃ClN₂O₂, synthesized by the reaction of 2-chloro­ethyl iso­cyanate and morpholine, crystallizes with four molecules in the asymmetric unit, which have similar conformations and comprise two pairs each related by approximate non-crystallographic inversion centres. Two of them have a modest orientational disorder of the 2-chloro­ethyl fragments [occupancy ratio of 0.778 (4):0.222 (4)]. In the crystal, mol­ecules are linked by N—H...O=C hydrogen bonds, forming three crystallographically different kinds of infinite hydrogen-bonded chains extending along [001].

N′-[(4Z)-1-(3-Methyl-5-oxo-1-phenyl-4,5-di­hydro-1H-pyrazol-4-yl­idene)hex­yl]benzene­sulfono­hydrazide

In the title compound, C₂₂H₂₆N₄O₃S, the dihedral angle between the pyrazoloneand phenyl rings is 21.73 (4)°. The benzensulfono­hydrazide group adopts a gauche conformation about the N—N vector. The C—N—N—S torsion angle is −109.88 (13)°. The mol­ecule exists as the enamine tautomeric form (C=C—NH). An intra­molecular N—H...O=C hydrogen bond occurs. In the crystal, mol­ecules are linked by pairs of N—H...O=C hydrogen bonds, forming centrosymmetric dimers.

Crystal structure of N′-[(1E)-1-(6-methyl-2,4-dioxo-3,4-di­hydro-2H-pyran-3-yl­idene)eth­yl]benzene­sulfono­hydrazide

In the title compound, C₁₄H₁₄N₂O₅S, the mol­ecule exists in the enamine (C=C—NH) tautomeric form. The hydrazone fragment derived from the 3-acetyl-4-hy­droxy-6-methyl-2H-pyran-2-one moiety is approximately planar, with a maximum deviation of 0.1291 (11) Å for the N atom bound to the S atom of the benzensulfono­hydrazide group. The latter adopts a gauche conformation relative to the hydrazone N—N bond, with an N—N—S angle of 113.54 (10)°. There is an intra­molecular N—H...O=C hydrogen bond that stabilizes the tautomeric form. In the crystal, mol­ecules are linked by N—H...O=C hydrogen bonds into chains extending parallel to [100].