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The reaction of 2,3-acetylenic acids (1a–d) with thionyl chloride in DMF under mild conditions gave E,Z-3-chloro-2-alkenoic acids (2a–d) or esters (3a–d) depending on treating the reaction mixture with either water or alcohols.
The authors would like to thank NMR Laboratory at Chemistry Department-Universidad Simón Bolívar (Proyect BID-CONICIT QF-13) and The National NMR Laboratory.
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