Process for the preparation of polycyclic ethers of formula ##STR1## wherein X represents --(CH.sub.2).sub.n --, index n stands for integer 0 or 1, symbol R.sup.4 designates a hydrogen atom or a methyl radical, symbols R.sup.1 and R.sup.2, identical or different, represent each a hydrogen atom or a lower alkyl radical from C.sub.1 to C.sub.3 and R designates either a C.sub.1 to C.sub.6 linear or branched alkyl radical, or a substituted or unsubstituted alkylene radical having 2 or 3 carbon atoms in the main chain, said alkylene radical forming a ring such as indicated by the dotted line, which process comprises the cyclization by means of an acidic agent of an unsaturated compound: a) of formula ##STR2## having a double bond in one of the positions indicated by the dotted lines, and wherein index m defines an integer number equal to 1 or 2, symbol R.sup.3 stands for a hydrogen atom or a protecting group of the hydroxyl function bound to the oxygen atom and able to dissociate itself from the latter under the reaction conditions, the wavy line represents a C-C bond of cis or trans configuration and index n and symbols R, R.sup.2 and R.sup.4 are defined as above; or b) of formula ##STR3## wherein symbols R.sup.2, R.sup.3 and R.sup.4, index n and the wavy line are defined as above; or c) of formula ##STR4## wherein symbols R.sup.2, R.sup.3 and R.sup.4, index n and the wavy line are defined as above. Some of the compounds (I) are novel and can be used in the perfume industry.
制备多
环醚化合物的方法,其中
化学式为 ##STR1## 其中 X 代表 --(CH.sub.2).sub.n --,指数 n 为整数 0 或 1,符号 R.sup.4 表示氢原子或甲基基团,符号 R.sup.1 和 R.sup.2,相同或不同,分别表示氢原子或碳原子数为 C.sub.1 到 C.sub.3 的较低烷基基团,R 表示 C.sub.1 到 C.sub.6 的线性或支链烷基基团,或者有 2 或 3 个碳原子的主链上形成环的取代或未取代的烷基基团,该烷基基团形成一个如虚线所示的环,所述方法包括通过酸性试剂对不饱和化合物进行环化:a)
化学式为 ##STR2## 且其中指数 m 定义为整数 1 或 2,符号 R.sup.3 代表氢原子或与氧原子结合的羟基功能的保护基,能够在反应条件下与后者解离,波浪线表示顺式或反式构型的 C-C 键,指数 n 和符号 R、R.sup.2 和 R.sup.4 如上所定义;或 b)
化学式为 ##STR3## 其中符号 R.sup.2、R.sup.3 和 R.sup.4、指数 n 和波浪线如上所定义;或 c)
化学式为 ##STR4## 其中符号 R.sup.2、R.sup.3 和 R.sup.4、指数 n 和波浪线如上所定义。其中一些化合物 (I) 是新颖的,可用于
香料工业。