| 摘要 |
Substituted phenols of formula <IMAGE> (I) in which R1 is in an ortho or para position relative to the phenol function and denotes <IMAGE> R2 denotes an acyclic radical optionally substituted by alkyl, hydroxy, alkoxycarbonyl, cyano or formyl, or a phenyl or naphthyl radical, and R denotes hydrogen or 1 to 4 substituents chosen from halogen, OH optionally in the form of ether or ester, alkyl, NO2, CHO optionally in the form of acetal, CH3CO-, C6H5CO-, NH2, alkylamino, dialkylamino or alkoxycarbonyl, it being understood that 2 symbols R may form with the phenyl nucleus a condensed aromatic ring, which comprises reacting a butadiene of formula <IMAGE> (II) with a phenol for formula <IMAGE> (III) in water in the presence of a rhodium-based catalyst, a water-soluble phosphine and optionally an inorganic or organic base. The products of formula (I) are intermediates for the synthesis of vitamin E, antioxidants, perfumes or insecticides. |
