Reaction of (2a–c) with alkyl-lithium leads to (4), which rearranges to (6) on reaction with toluene-p-sulphonic acid, AgClO4–C6H6, or FeCl3–pyridine.
M. S. Baird, P. Sadler, J. Hatem, J. Zahra and B. Waegell, J. Chem. Soc., Chem. Commun., 1979, 452 DOI: 10.1039/C39790000452
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