Unsaturated macrocyclic ketones; their preparation; preparation of other unsaturated macrocyclic ketones; preparation of saturated macrocyclic ketones; application in perfume and flavour compositions of some unsaturated macrocyclic ketones

摘要

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.