Benzoic acid, 4-((5,6,7,8-tetrahydro-5,5-dimethyl-8-oxo-2-naphthalenyl)ethynyl)-, ethyl ester → 4-[(5,6,7,8-Tetrahydro-8,8-dimethyl-5-oxonaphth-3-yl)ethynyl]benzoic acid

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Employing the same general procedure as for the preparation of 4-[(5,6,7,8-tetrahydro-8,8-dimethyl-5-oxonaphth-2-yl) ethynyl]benzoic acid (Compound 7), 500 mg (1.45 mmol) of ethyl 4-[(5,6,7,8-tetrahydro-8,8-dimethyl-5-oxonaphth-3-yl)ethynyl]benzoate (Compound 2) was converted into the title compound using 4 ml (4 mmol) of LiOH (1 N aqueous solution).

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