Ozone → (+/-)-cis-4-(2-Oxoethyl)-1,5-dioxaspiro[5.5]undecane-2-acetonitrile

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A solution of (±)-cis-4-(2-propenyl)-1,5-dioxaspiro[5.5]undecane-2-acetonitrile 4.26 g (19.42 mmol), in 100 mL of dichloromethane is cooled to -78° C. under nitrogen. Ozone (Welsbach generator, flow rate 0.1, voltage=90 V) is then passed through a fritted gas inlet tube into the solution until the blue color of ozone appears. The current is turned off, and oxygen bubbled through until the blue color is discharged. Triphenylphosphine, 5.6 g (21.36 mmol), is added and the colorless solution is allowed to warm to room temperature. Flash chromatography provides after concentration in vacuo 4.04 g of pure (±)-cis-4-(2-oxoethyl)-1,5-dioxaspiro[5.5]undecane-2-acetonitrile.

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