Synthesis of Substituted Bis-Semicarbazides by Reaction of Hexamethylene Diisocyanate with Hydrazine Derivatives

New bis-semicarbazides were obtained by the reaction of hexamethylene diisocyanate with aliphatic and aromatic acids hydrazides, as well as semicarbazide, thiosemicarbazide, and 4-substituted thiosemicarbazides.