Uaturated ketones of formula
possessing two single or two double bonds in the positions indicated by the dotted lines (n = 1 or 2) are prepared by reacting, in the presence of a basic reagent, a dialdehyde of formula
wherein the index n and the dotted lines have the above meaning with a diphosphonate of formula
wherein R represents an alkyl radical.
Compounds of formula (I), which are new, are also useful perfuming and flavouring ingredients.
式中的不饱和
酮
在虚线所示位置(n = 1 或 2)具有两个单键或两个双键的式不饱和
酮,是在碱性试剂存在下,通过与式 2 的二醛反应制备的。
式中的指数 n 和虚线具有上述含义。
其中 R 代表烷基。
新型的式 (I) 化合物也是有用的香
水和
香料成分。