| 摘要 |
<p>NEW MATERIAL:A compound expressed by formula I (R<1> to R<3> represent H or methyl; R represents H or protecting group of OH). EXAMPLE:2,5,7,8-Tetramethyl-2-(4'-chloro-4'-methylpentyl)-6-chromanol. USE:An intermediate for synthesis of vitamin Es. PREPARATION:Hydroquinones expressed by formula II (example; 2,3,5- trimethylhydroquinone) are condensed with a 1,7-dichloro-3,5-dimethyl-oct-2-ene expressed by formula III preferably in an organic solvent such as ethyl acetate, dichloromethane or dioxane normally using a catalyst (example; Lewis acid or protonic acid) preferably at 25-50 deg.C.</p> |
