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Synthesis 1987; 1987(9): 837-838
DOI: 10.1055/s-1987-28095
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Improved Synthesis of Bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF): π-Donor for Synthetic Metals

K. Sukumar Varma* , Adrian Bury, Nigel J. Harris, Allan E. Underhill
  • *Department of Chemistry and Institute of Molecular and Biomolecular Electronics, University College of North Wales, Bangor, Gwynedd LL57 2UW, U. K.
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Publikationsdatum:
12. September 2002 (online)

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2,5,7,9-Tetrathiabicyclo[4.3.0)]non-1(6)-en-8-thione (3) is prepared in increased yield by isolating the intermediate 4,5-dimercapto-1,3-dithiole-2-thione disodium salt (2) which undergoes efficient ring-closure with 1,2-dibromoethane. Quantitative oxidation of 3 with mercuric acetate to 2,5,7,9-tetrathiabicyclo [4.3.0]non-1(6)-en-8-one (4) followed by coupling with triethyl phosphite yields bis(ethylenedithio) tetrathiafulvalene (BEDT-TTF) in high overall yield.