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2-Benzylidene-2,3-dihydrophenalen-i-one with ethyl acetoacetate and sodium ethoxide yields four products depending on the concentration of the alkali. One of these, ethyl 7a,8,9,10-tetrahydro-10-oxo-8- phenyl-7H-benz[de]-anthracene-9-carboxylate has been converted into 8-phenyl-7H-benz[de]anthracene and its reduction with sodium borohydride or hydrogen in the presence of platinum oxide or Raney nickel presents points of interest.
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