反应详情

Ozone was bubbled into a solution of 1,1-dimethylethyl 2,2-dimethyl-6-(2-phenylethenyl)-1,3-dioxane-4-acetate (3.0 g, 9 mmol) in 100 mL of methylene chloride at -78° C. until a blue color persisted. Nitrogen was then bubbled into the solution without cooling until the color disappeared. The temperature had risen to -20° C. Methyl sulfide (3 mL) was added and the solution stirred for 18 hours. The solvent was removed in vacuo and the residue purified by chromatography on silica eluting with 20% ethyl acetate in hexane to give 1.78 g of the title compound. Recrystallization from pentane gave the compound as a white solid; m.p.=71-73° C.

1. customNitrogen was then bubbled into the solution
2. temperaturewithout cooling until the color
3. customhad risen to -20° C
4. additionMethyl sulfide (3 mL) was added
5. customThe solvent was removed in vacuo
6. customthe residue purified by chromatography on silica eluting with 20% ethyl acetate in hexane