| 摘要 |
PURPOSE:To obtain the subject compound useful as a component of a perfumery composition having excellent citrus-like perfume by using 4,4-dimethyl-2-phenyl-4- butanolide as a raw material, reducing the material and treating under acidic condition. CONSTITUTION:The objective compound of formula I can be produced by reducing 4,4-dimethyl-2-phenyl-4-butanolide of formula II with a reducing agent such as LiAlH4 in an ether solvent or with hydrogen under high pressure in a lower alcohol solvent in the presence of a Cu-Cr catalyst to form the compound of formula III and treating the compound in a solvent such toluene at the refluxing temperature under acidic condition with Amberlist 15, etc., (a weakly acidic cation exchange resin), thereby effecting dehydrative cyclization reaction. The objective compound has citrus-like, green-like, citronella-like or pepper-like perfume imaging grapefruit and used singly or in combination with other perfumery components as a component of perfumery, shampoo, etc. |
