Two dehydroanthrones, 11H-indeno[1,2-b]-anthracen-11-one and 7H-indeno[2,1-a]anthracen-7-one, have been obtained in the pyrolysis of 2-o-toluoylfluorene—a first example of a rearrangement of the ordinary 9H-fluorene system into the tautomeric 3H- and 1H-fluorene ones.
N. P. Buu-Hoï, C. Marie, F. Périn and P. Jacquignon, J. Chem. Soc. D, 1970, 734 DOI: 10.1039/C29700000734
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