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US 5,206,388 AGranted
Process for the preparation of 5,6,11,12-tetrathiotetracene
AssigneeCiba-Geigy Corporation
InventorAlex Alder
Life of this patent
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Abstract
The reaction of 5,6,11,12-tetrachlorotetracene with thiourea and sulfur in a polar aprotic solvent yields 5,6,11,12-tetrathiotetracene in high yield and purity. This compound is an electron donor for forming electrically conductive radical cation salts with electron donors.
Claims11
A process for the preparation of 5,6,11,12-tetrathiotetracene of formula I ##STR3## by reacting 5,6,11,12-tetrachlorotetracene of formula II ##STR4## with thiourea in the presence of a polar aprotic solvent, which process comprises carrying out the reaction with a mixture of thiourea and sulfur.
Dependencies are inferred from the claim text.