The reaction of the pentafluorobenzenethiolate ion with ethyl acetylenedicarboxylate gave a derivative of 4,5,6,7-tetrafluorobenzo[b]thiophen by a new, one-step cyclisation reaction. Other synthetic approaches to this ring system by conventional cyclisation reactions are presented.
G. M. Brooke and Md. A. Quasem, J. Chem. Soc. C, 1967, 865 DOI: 10.1039/J39670000865
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