CS(C)=O.C(Cl)(=O)C(Cl)=O.[CH3:11][O:12][C:13]1[CH:18]=[CH:17][C:16]([CH2:19][CH2:20][OH:21])=[CH:15][CH:14]=1.C(N(CC)CC)C>ClCCl.O>[CH3:11][O:12][C:13]1[CH:18]=[CH:17][C:16]([CH2:19][CH:20]=[O:21])=[CH:15][CH:14]=1DMSO (5.2 mL, 72.6 mmol) in dichloromethane (14.5 mL) was added to a solution of oxalyl chloride (3.1 mL, 36.3 mmol) in dichloromethane (83 mL) at −70° C. under nitrogen. After stirring for 5 minutes, 2-(4-methoxyphenyl)ethanol (5.0 g, 33.0 mmol) dissolved in dichloromethane (33 mL) was added drop wise (20 min). Stirring was continued for an additional 20 min. and triethyl amine (9.7 mL, 69.3 mmol) was added, and the reaction mixture was stirred and warmed slowly to room temperature for 1 hour. The reaction mixture was diluted with water. The organic layer was separated, dried over sodium sulfate, filtered and concentrated in vacuo to provide 2-(4-methoxyphenyl)acetaldehyde (553) (2.2 g, 44.4%) as an oil residue.
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