Methyl iodide → 2-Methylindanone

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A 2 M solution of LDA (21 mL, 1.05 eq, from Aldrich) was added dropwise to 3-phenyl-1-indanone (8.33 g, 40.0 mmol) in THF (300 mL) at −78° C. After 1 h at this temperature, iodomethane (3.00 mL, 1.2 eq) was added. The mixture was stirred at −78° C. for 2 h, at 0° C. for 30 min and quenched with sat NH4Cl (100 mL). After evaporation of THF in vacuo, the aqueous residue was extracted with EtOAc (3×100 mL). The combined extracts were washed with brine (20 mL), dried (MgSO4) and concentrated. Silica gel chromatography (EtOAc-Hex, 5:95 then 7:93 then 10:90) gave the 2-methylindanone (1.93 g, 22%). MS Found: (M+H)+=223.

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