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amount). After addition of the starting material, aldehyde
(1.0 molar amount), to the resulting suspension addition of
methanol (1 vol) follows. The resulting reaction mixture
was vigorously stirred under the air at room temperature.
The progress of the oxidation reaction was monitored by
silica-gel thin layer chromatography. After completion of
the reaction, the resulting mixture was neutralized with
0.1 M aqueous HCl solution. If the crude product is quite
soluble in organic solvent, it was extracted with sufficient
ethyl acetate. The combined organic layer was separated,
dried over anhydrous MgSO4, and concentrated via rotary-
evaporation. The residue was purified by flash silica-gel
column chromatography with ethyl acetate or appropriate
ethyl acetate/hexane eluent system. If the solubility of crude
product is poor in organic solvent, the residue was purified
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