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On the other hand, to a 3 L volume four-necked flask, diethyl oxalate (295 g) and tetrahydrofuran (anhydrous) (350 ml) were added under a nitrogen atmosphere and cooled on ice-bath. The above mentioned solution of 1,3,5-triethylphenylmagnesium bromide in tetrahydrofuran was added thereto with keeping the temperature below 10° C. The resulting mixture was stirred at room temperature for 2 hours. The pH of the mixture was adjusted to less than 2 with 20 w/w % of sulfuric acid under ice-cooling. The mixture was extracted with toluene. The organic layer was dried over anhydrous sodium sulfate, and concentrated under reduced pressure to give 495.3 g of ethyl 2-(1,3,5-triethylphenyl)-2-oxoacetate (9-b).

1. temperaturecooled on ice-bath
2. additionwas added
3. customthe temperature below 10° C
4. temperaturecooling
5. extractionThe mixture was extracted with toluene
6. dry with materialThe organic layer was dried over anhydrous sodium sulfate
7. concentrationconcentrated under reduced pressure