From 1,2-Dithiones, Including Dithiaoxamides and Esters of Tetrathiaoxalate

From 1,2-Dithiones, Including Dithiaoxamides and Esters of Tetrathiaoxalate 

Few dithiolenes are prepared via reactions involving 1,2-dithioketones, a rare class of compounds prone to oligomerization. The first stable 1,2-dithione, l,2-bis(4-dimethylaminophenyl)ethane-l,2-dithione, was generated by photolysis 

A subset of the 1,2-dithiones are dialkyl tetrathiooxalate esters, C2S2(SR)2-The parent C2S2(SMe)2 exists in dynamic equilibrium with its dimer (Eq. 15) (179). 

Yields are diminished if the filiation is conducted prior to the addition of the metal, indicative of the thermal instability of these dithioamides. Furthermore, the yields are lower when Ni(II) salts are used in place of Ni powder, consistent with the oxidative character of the dithioamide. Nickel dithiolenes of the dithio-oxamides exhibit extraordinary extinction coefficients ( 80,000 dm3 mol em 1 at 1000 nm) (186, 187). 

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F. From 1,2-Dithiones, Including Dithiaoxamides and Esters of Tetrathiaoxalate / 23... 

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