Methanol → 3-(Dimethoxymethyl)cyclopentanecarbaldehyde

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Into a 3-neck round bottom flask 2-norbornene (5.500 g, 0.05841 mol) was dissolved in DCM (198.0 mL,) and methanol (38.5 mL) and was cooled at −78° C. Ozone was passed through the reaction until it turned blue and was stirred at −78° C. for 30 minutes. Then nitrogen was passed through for 20 minutes and p-toluenesulfonic acid (0.95 g, 0.0055 mol) was added The reaction was allowed to warm at 20° C. and was stirred for 90 minutes. Into the reaction was added sodium bicarbonate (1.67 g, 0.0199 mol) and the resulting mixture was stirred at 20° C. for 30 minutes and dimethyl sulfide (9.4 mL, 0.13 mol) was added. The reaction was stirred for 16 hours and was reduced by rotary evaporation to ˜50 mL The reaction was extracted with DCM and the organic extracts were washed with water and brine, dried (MgSO4), and stripped in vacuo. The reaction was distilled at 135° C. (bath temperature) at high pump vacuum to give the product (7.5 g) as a ˜2:1 mixture of diastereomers. NMR (300 MHz, CDCl3): 9.64 & 9.62 (d, 1H), 4.15 & 4.12 (s, 1H), 3.35 & 3.34 (s, 6H), 2.77 m, 1H), 2.34 (m, 1H), 1.35-2.00 (m, 6H).

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