Abstract Tetrakis (trifluoromethyl) tetrathiafulvalene (5) was formed in a phase-transfer- catalyzed unusual one-step reaction by basic cleavage and subsequent alkylation of 1, 3, 4, 6-tetrathiapentalene-2, 5-dione (thiapendione)(1) with 2, 3-dichlorohexafluoro-2-butene. As an example of the normal course of this reaction the synthesis of 4, 5-(ethylenedithio)-1, 3- dithiol-2-one (3) is described.
![[1,3]Dithiolo[4,5-d][1,3]dithiole-2,5-dione Structure](https://image.chemsrc.com/caspic/495/64394-45-2.png)
![2-[4,5-bis(trifluoromethyl)-1,3-dithiol-2-ylidene]-4,5-bis(trifluoromethyl)-1,3-dithiole Structure](https://image.chemsrc.com/caspic/315/26393-26-0.png)