1-(5-Chloro-6-fluoro-1,3-benzothiazol-2-yl)hydrazine

In the title compound, C7H5ClFN3S, the 1,3-benzothiazole ring system is nearly planar (r.m.s. deviation = 0.023 Å). In the crystal, molecules are linked via intermolecular N—H⋯N hydrogen bonds into a two-dimensional network parallel to (100).

It was then refluxed for 3-4 h. A colourless solid was precipitated at the end of the reflux period. The mixture was cooled and the product was filtered and then washed with water several times. It was air dried and recrystallized using ethanol.
The single crystals were grown by slow evaporation from solvent methanol (m.p. = 483-485 K).

Refinement
All hydrogen atoms were located in a difference Fourier map and refined freely with N-H = 0.815 (16)

Figure 2
The crystal structure of the title compound, viewed along the b axis. H atoms not involved in hydrogen bonds (dashed lines) have been omitted for clarity.

1-(5-Chloro-6-fluoro-1,3-benzothiazol-2-yl)hydrazine
Crystal data  (Cosier & Glazer, 1986) operating at 100.0 (1) K. Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes. Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > 2sigma(F 2 ) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.