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The spectral and physical data of aldehyde 3 and ketone 4 matched in all respects with reported data (ref. 6, Selected Physical Data Compound 3: clear oil; Rf, 0.43 (Et2O-hexane, 10:90, α]D20 +51.6 (c 1.0 CHCl3, 6 Compound 4: colorless oil; Rf, 0.50 (EtOAc-hexane, 10:90, α]D20 +30.5 (c 1.0 CHCl 3).6 Compound 5: colorless oil; Rf, 0.40 (EtOAc-hexane, 10:90, α]D20 +19.4 (c 1.0 CHCl3, 1H NMR (300 MHz, CDCl3, δ, 3.65 (dd, 1 H, J, 12.0, 4.5 Hz, 3.53 (dd, 1 H, J, 12.0, 8.3 Hz, 2.95 (t, 1 H, J, 6.0 Hz, 1.95 (dd, 1 H, J, 8.3, 5.3 Hz, 1.55 (m, 2 H, 1.29 (s, 3 H, 1.05 (t, 3 H, J, 7.5 Hz, 13C NMR 75 MHz, CDCl3, δ, 65.6, 61.4, 61.1, 21.4, 13.9, 10.3. LC-MS
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+]: 285.1820; found: 285.1823.
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