Fluorene has been acylated with phthalic anhydride and with homophthalic anhydride; the products have been briefly studied. Reaction of fluorenoyl chloride with methyl homoveratrate gave methyl-4,5-dimethoxy-2(2-fluorenoyl)phenylacetate which was converted, in several stages, into a dihydrodibenzanthrazulene. The latter underwent oxidation to carbonyl compounds rather than dehydrogenation.
G. R. Proctor and J. Savage, J. Chem. Soc. C, 1969, 1932 DOI: 10.1039/J39690001932
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