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0 °C

A solution of 2-(Hydroxymethyl)-2,3-dihydro-1H-indene-5-carbonitrile (3.7 g, 21 mmol) in 80 mL of DCM was added Dess-Martin reagent (18 g, 43 mmol) in one portion at 0° C. The mixture was stirred at 0° C. for 1 hour, and then stirred at rt. overnight. The reaction mixture was purified with column chromatography (EtOAc:PE=1:20) to obtain 2-Formyl-2,3-dihydro-1H-indene-5-carbonitrile. 1H-NMR (400 MHz, CDCl3) δ 9.77 (d, J=1.2 Hz, 1H), 7.45-7.51 (m, 2H), 7.32 (d, J=7.6 Hz, 1H), 3.32-3.40 (m, 3H), 3.18-3.25 (m, 2H).

1. stirringstirred at rt
2. customovernight
3. customThe reaction mixture was purified with column chromatography (EtOAc:PE=1:20)