The palladium–sulphur method has been used to dehydrogenate 3,4,5,6,7,8-hexahydro-1-(1,2,5,6,7,8-hexahydro-4-phenanthryl)anthracene to the title compound. Two intermediates, tetrahydrobenzo[a]-5,6,7,8-tetrahydronaphtho[1,2-j]fluoranthene and tetrahydrobenzo[a]naphtho[1,2-j]fluoranthene, were isolated and their structures established.
M. Crawford and V. R. Supanekar, J. Chem. Soc. C, 1966, 2252 DOI: 10.1039/J39660002252
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