Keywords: 1,2-dithione.valence.tautomerism.png en 1 2-dithione - 1 2-dithiacyclobutene valence tautomerism Ar C6H4NMe2 W Kusters P de Mayo J Amer Chem Soc 1973 95 2383 own Kurgus 2009-12-20 File 1 2-dithione valence tautomerism svg Tautomerism Thioketones C-S bond forming reactions |