Process for selective C-alkylation of phenols
    171.
    发明授权
    Process for selective C-alkylation of phenols 失效
    苯酚选择性C烷基化方法

    公开(公告)号:US4594460A

    公开(公告)日:1986-06-10

    申请号:US713691

    申请日:1985-03-19

    CPC classification number: C07C67/343 C07C213/08 C07C37/14 C07C41/30

    Abstract: Substituted phenols of formula ##STR1## in which R.sub.1 is in an ortho or para position relative to the phenol function and denotes ##STR2## R.sub.2 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, NO.sub.2, CHO optionally in the form of acetal, CH.sub.3 CO--, C.sub.6 H.sub.5 CO--, NH.sub.2, 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 ##STR3## with a phenol for formula ##STR4## 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.

    Abstract translation: 其中R 1相对于苯酚官能团为邻位或对位的式(I)的取代酚,表示任选被烷基,羟基,烷氧基羰基,氰基或甲酰基取代的无环基,或 苯基或萘基,R表示氢或1至4个选自卤素,任选以醚或酯形式的OH的取代基,烷基,NO 2,CHO,任选以缩醛,CH 3 CO-,C 6 H 5 CO-,NH 2,烷基氨基, 二烷基氨基或烷氧基羰基,应理解为可以与苯基一起形成2个符号R的稠合芳香环,其包括在式(III)中的水中使式(VIII)的二醇与式 存在铑基催化剂,水溶性膦和任选的无机或有机碱。 式(I)的产物是用于合成维生素E,抗氧化剂,香料或杀虫剂的中间体。

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