This review presents a systematic and comprehensive survey of the methods of preparation, structural studies, chemical reactivities and synthetic potentiality of dithiols.

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In the Table three of the ligands R 2 were wrongly presented. The correct ligands are given below:Product 4f: R 2 = CONH 2 Product 4g: R 2 = CO 2 Bn Product 4h: R 2 = CO 2 Me This document was downloaded for personal use only. Unauthorized distribution is strictly prohibited.

The mol­ecule of the title compound, C9H9N5O, is essentially planar (r.m.s. deviation of all atoms = 0.02 Å) except for the NH2 H atoms. An intra­molecular hydrazinyl­idene–carbonyl N—H⋯O=C hydrogen bond is present. In the crystal, mol­ecules are connected via N—H⋯N/O hydrogen bonds, forming thick layers parallel to (100).