tert-Butyl hydroperoxide → Bis(1-cyclohexyloxy-2,2,6,6-tetramethylpiperidin-4-yl) sebacate

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A mixture of 20.0 g (41.6 mmol) of di-(2,2,6,6-tetramethylpiperidin-4-yl) sebacate, 43 g (334 mmol) of 70% aqueous t-butyl hydroperoxide, 1.3 g (9.0 mmol) of molybdenum trioxide, and 125 ml of cyclohexane is heated at reflux for 2.3 hours. Water is collected in a Dean-Stark trap. The red reaction mixture is cooled and transferred to a Fischer-Porter bottle. Fresh cyclohexane (25 ml) is used to thoroughly rinse the flask, and the rinsings are added to the pressure bottle. The pressure bottle is immersed in an oil bath (140° C.) for 3 hours whereupon the colorless reaction mixture is cooled to room temperature and filtered. The filtrate is stirred with 10 g of sodium sulfite in 90 ml of water for 2 hours to decompose unreacted hydroperoxide, then diluted with ethyl acetate (200 ml) and water (100 ml). The organic layer is washed with 10% sodium sulfite (100 ml), water (100 ml), saturated sodium chloride (100 ml), then dried over magnesium sulfate and concentrated at reduced pressure. The crude product is purified by flash chromatography (silica gel, 100:2 heptane:ethyl acetate) to afford 17.8 g (63% yield) of a white solid, m.p. 56°-9° C.

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