Sodium Hydroxide → beta-Chloro-4-methyl-gamma-oxobenzenbutanoic acid methyl ester

関与物質

反応条件

反応手順

A stirred solution of 152.6 g (0.74 mole) of 3-(4-methylbenzoyl)propionic methyl ester in 225 mL of methylene chloride was cooled to -5° C. in methanol:ice bath. A solution of 109.9 g (66 mL, 0.81 mole) of sulfuryl chloride (97%) in 65 mL of methylene chloride was added dropwise at a rate which maintained the temperature at 0° C. The reaction mixture was allowed to warm to ambient temperature and stirred overnight. The reaction mixture was cooled to 0° C. in an ice bath and treated with 3N sodium hydroxide until just basic. The organic portion was separated, dried over magnesium sulfate and concentrated in vacuo (172.9 g). The oil was distilled at 125° C. (150 mm Hg) in 4 fractions. A sample of fraction 2 was sent for elemental analysis.

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