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A solution of 1,2,3,4-tetrahydro-1,1,7-trimethyl-naphthalene (9.60 g, 55 mmol), potassium bromate (9.17 g, 55 mmol), cerium ammonium nitrate (1.50 g) in water (28 mL) and dioxane (44 mL) was heated under argon at 85° C. for 6 hours. The mixture was then cooled to 0° C., diluted with ethyl acetate and water. The organic phase was separated and the aqueous phase extracted with ethyl acetate. The combined organic extracts were washed with water (2×), saturated sodium bicarbonate and brine, dried over anhydrous magnesium sulfate, filtered and concentrated. The residue was purified by silica gel chromatography (6.5×17 cm, 10% ethyl acetate/hexane) to give the title material (9.2 g, 89%) as a colorless oil.

1. customThe organic phase was separated
2. extractionthe aqueous phase extracted with ethyl acetate
3. washThe combined organic extracts were washed with water (2×), saturated sodium bicarbonate and brine
4. dry with materialdried over anhydrous magnesium sulfate
5. filtrationfiltered
6. concentrationconcentrated
7. customThe residue was purified by silica gel chromatography (6.5×17 cm, 10% ethyl acetate/hexane)