Sodium Hydroxide → 1-(2,2-Diphenyl-benzo(1,3)dioxol-5-yl)-propan-1-one

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A mixture of 3,4-dihydroxypropiophenone (ICN Biomedicals, Inc., 3300 Hyland Ave., Costa Mesa, Calif., 92626, USA, 5.0 g, 30 mmol) and dichlorodiphenylmethane (10.0 mL, 52.1 mmol) was heated for 7 min at 170° C. The reaction was cooled and poured into 1 N sodium hydroxide. The mixture was extracted with ether (2×) and the combined extracts were washed with water and brine. The organic layer was dried over magnesium sulfate and concentrated. The residue was flash chromatographed on silica gel (2×5 inches packed in hexane) with elution proceeding as follows: 2% ether/hexane (500 mL), 0.84 g of a white solid tentatively identified as 2-chloro-1-(2,2-diphenyl-benzo(1,3)dioxol-5-yl)-propan-1-one; 5% ether/hexane (250 mL), 1.9 g of an unidentified orange oil; 5% ether/hexane (250 mL), 2.18 g of recovered dichlorodiphenylmethane; 10% ether/hexane (500 mL), 4.82 g (48%) of 1-(2,2-diphenyl-benzo(1,3)dioxol-5-yl)-propan-1-one as an orange oil which solidified on standing. The product had: mp 69-70.5° C. Analysis calculated for C22H17CIO3: C, 79.98; H, 5.49. Found: C, 80.05; H, 5.34.

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