[CH2:1]([C:3]1[CH:8]=[C:7]([CH3:9])[CH:6]=[C:5]([CH2:10][CH3:11])[C:4]=1[C:12](=[O:16])[C:13](O)=[O:14])[CH3:2].C1(C)C=CC=CC=1.S(Cl)([Cl:26])=O>CN(C)C=O>[CH2:1]([C:3]1[CH:8]=[C:7]([CH3:9])[CH:6]=[C:5]([CH2:10][CH3:11])[C:4]=1[C:12](=[O:16])[C:13]([Cl:26])=[O:14])[CH3:2]To a 50 ml volume four-necked flask, 2-(2,6-diethyl-4-methylphenyl)-2-oxoacetic acid (8-a) (0.94 g), toluene (anhydrous) (3.0 ml) and dimethylformamide (anhydrous) (0.2 m) were added under a nitrogen atmosphere and the internal temperature was raised to about 50° C. Thionyl chloride (0.45 ml) was added thereto and the resulting mixture was stirred at 50° C. for 2 hours. The mixture was concentrated under reduced pressure, and azeotropically distilled with toluene to give 0.96 g of 2-(2,6-diethyl-4-methylphenyl)-2-oxoacetyl chloride (6-a).
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