4,7‐Dimethyl‐4,7‐dihydro[1,2,5]thiadiazolo‐[3,4‐b]pyrazine, a Novel Electron Donor with a 12π‐Electron Ring System

A very low first oxidation potential (0.15 V vs SCE) characterizes the 12π-electron title compound 1, which is formed by reduction of the corresponding 14π-electron system with potassium and trapping of the dianion with methyl iodide. Reaction of 1 with the electron acceptor 2 affords conducting charge-transfer complexes (σ = 5.6 × 10−2 S cm−1).