SCHEDULED MAINTENANCE
2-Ethoxycarbonylcyclopropyl(triphenyl)phosphonium fluoroborate 1 reacts with alkali-metal thiolates to give 2,3-disubstituted 4, 5-dihydrothiophenes 3 which can be aromatised to the corresponding thiophenes 5.
P. Chatterjee, P. J. Murphy, R. Pepe and M. Shaw, J. Chem. Soc., Perkin Trans. 1, 1994, 2403 DOI: 10.1039/P19940002403
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