STEROID COMPOUNDS. PART III. STUDIES IN THE MICHAEL  CONDENSATION OF 1-ACETYL-3: 4-DIHYDRONAPHTHALENE  AND ACETOACETIC ESTER

Michael condensation of 1-acetyl-3:4-dihydronaphthalene with ethyl sodio-acetoacetate leads to the formation of ethyl 4-keto-2-methyl. Δ ²:³-hexehydrophenanthrene-1-carboxtylate, showing that during the formation of the third ring, ring.closure involves the keto group of the acetoacetic ester residue.