反应详情

15 drops of 85% phosphoric acid were added to a mixture, cooled in a laboratory autoclave, of 76 g of 3-isopropenyl-1-methyl-2-methylene-cyclopentan-1-ol and 120 g of isopropenyl methyl ether. After gassing with nitrogen, the autoclave was brought, in an oil bath of 180° C, to an internal temperature of 150° C and held at this temperture until a distinct drop in pressure occurred (about 50-75 minutes). The reaction mixture was quenched by intensive cooling, treated with solid potassium hydroxide and concentrated under reduced pressure on a rotary evaporator. By fractional distillation over solid potassium hydroxide there were obtained 58 g (60%) of 3-isopropenyl-1-methyl-2-(3-oxobutyl)-cyclopent-1-ene; boiling point 0.01 = 69°-72° C; nD20 = 1.4836. The compound has a woody, camphoraceous, ionone-like fragrance.

1. customthe autoclave was brought, in an oil bath of 180° C, to an internal temperature of 150° C
2. custom(about 50-75 minutes)
3. customThe reaction mixture was quenched by intensive cooling
4. additiontreated with solid potassium hydroxide
5. concentrationconcentrated under reduced pressure on a rotary evaporator
6. distillationBy fractional distillation over solid potassium hydroxide there