ChemInform Abstract: Synthesis of 2‐Amino‐substituted‐1, 3, 4‐thiadiazoles via 2, 3‐Dichloro‐5, 6‐dicyano‐1, 4‐benzoquinone (DDQ) Mediated Intramolecular C—S Bond Formation in Thiosemicarbazones. Issue 26 (June 2016)