Production of 3-alkylcycloalkanols
    1.
    发明授权
    Production of 3-alkylcycloalkanols 有权
    3-烷基环烷醇的生产

    公开(公告)号:US06900359B2

    公开(公告)日:2005-05-31

    申请号:US10344531

    申请日:2001-08-10

    摘要: A method of making a 3-alkylcycloalkanol of formula 2: where R1 represents a methyl or ethyl group, R2 represents hydrogen, R3 represents an ethyl, propyl, butyl, isobutyl or isoamyl group, R4 represents hydrogen and R5 represents hydrogen, or a methyl, ethyl, propyl, isobutyl or isoamyl group comprises the following steps: (1) carrying out an electrophilic substitution reaction of an alkyl group or precursor thereof, on an ortho-substituted alkylbenzene compound of formula 3: where R6 represents hydrogen, or a methyl or ethyl group; (2) hydrogenating the reaction product of step (1); (3) performing an elimination reaction on one or more reaction products of step (2) to produce one or more alkene products; and (4) hydrating the one or more alkene products of step (3) to provide a 3-alkylcycloalkanol of formula 2. The electrophilic substitution reaction of step (1) may be a Friedel-Crafts acylation, e.g. using an isopropyl ketone precursor, or a Friedel-Crafts alkylation, e.g. using an isobutyl group. The 3-alkylcycloalkanols, especially 3-(2-methylpropyl)-1-methylcyclohexanol, are useful fragrance materials and find use in perfumes and perfumed products.

    摘要翻译: 制备式2的3-烷基环烷醇的方法:其中R 1表示甲基或乙基,R 2表示氢,R 3, 代表乙基,丙基,丁基,异丁基或异戊基,R 4表示氢,R 5表示氢,或甲基,乙基,丙基,异丁基或异戊基包括 以下步骤:(1)在式3的邻位取代的烷基苯化合物上进行烷基或其前体的亲电取代反应:其中R 6表示氢,或甲基或乙基 组; (2)氢化步骤(1)的反应产物; (3)对步骤(2)的一种或多种反应产物进行消除反应以产生一种或多种烯烃产物; (4)将步骤(3)的一种或多种烯烃产物水合以提供式2的3-烷基环烷醇。步骤(1)的亲电取代反应可以是Friedel-Crafts酰化反应,例如。 使用异丙基酮前体,或Friedel-Crafts烷基化,例如。 使用异丁基。 3-烷基环烷醇,特别是3-(2-甲基丙基)-1-甲基环己醇是有用的香料,可用于香料和香料产品中。