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Ram VJ, Srivastava P, Saxena AS. Carbanion-Induced Base-Catalyzed Synthesis of 1H-Isothiochromenes, Benzo[c]thiochromenes, Benzo[c]chromenes, and 1-Benzothiophenes through Ring-Transformation Reactions of 6-Aryl-2H-pyran-2-ones†. J. Org. Chem. 2001 Jul 13;66(16):5333–7. doi: 10.1021/jo0100648. |