Partially fluorinated heterocyclic compounds. Part XI. The reactions of lithium pentafluorobenzenethiolate with acetylenic compounds giving benzo[b]thiophen derivatives and/or olefins
- 1 January 1973
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 1
- p. 429-432
- https://doi.org/10.1039/p19730000429
Abstract
Lithium pentafluorobenzenethiolate reacts (i) with diethyl acetylenedicarboxylate to give diethyl 4,5,6,7-tetrafluorobenzo[b]thiophen-2,3-dicarboxylate; (ii) with ethyl phenylpropiolate to give ethyl 4,5,6,7-tetrafluoro-2-phenylbenzo[b]thiophen-3-carboxylate and a small amount of the product of thiol addition to the triple bond; (iii) with hexafluorobut-2-yne to give 4,5,6,7-tetrafluoro-2,3-bistrifluoromethylbenzo[b]thiophen and the all-trans-1-pentafluorophenylthio-1,2,3,4-tetrakistrifluoromethylbutadiene; (iv) with ethyl propiolate to give ethyl cis- and trans-β-(pentafluorophenylthio)acrylate; and (v) with diphenylacetylene to give cis- and trans-α-pentafluorophenylthiostilbene. The failure to trap olefinic material in (i), and the absence of cyclised materials in (iv) and (v) have not been rationalised.Keywords
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