Sodium hydride → 3-(3,5-Di-tert-butyl-4-hydroxyphenyl)-1-n-dodecylpyrrolidine-2,5-dione

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This compound is prepared by the procedure of Example 1 from 2.40 g (0.1 mol) of sodium hydride, 20.63 g (0.1 mol) of 2,6-di-tert-butylphenol, and 26.54 g (0.1 mol) of N-n-dodecylmaleimide in tert-butyl alcohol. The reaction mixture is concentrated in vacuo and the residue is dissolved in 800 ml of toluene. The toluene solution is extracted sequentially with 1M sodium hydroxide (2×100 ml) and water (6×200 ml). The organic phase is dried over anhydrous sodium sulfate. The solvent is removed in vacuo and the residue purified by flash chromatography (8:2 heptane: ethyl acetate eluent) followed by recrystallization from petroleum ether to give 8.15 g (17%) of a white solid: mp 66°-70° C.

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