A Facile and Convenient Method for the Synthesis of Bis-Hydrazonoyl Halides and Bis-(1,3,4-Thiadiazol-3-ylphenoxy)Ethers

New bis(thiadiazole) derivatives 7a–m were prepared in good yields by the reaction of the appropriate hydrazonoyl halides 4a–e with the bis-Schiff bases 9a–c. Similarly, the bis(thiadiazole) derivatives 17a–g were prepared by the reaction of the novel bis-hydrazonoyl halides 13a–d with schiff bases 3a–d.