UNSATURATED MACROCYCLIC KETONES; THEIR PREPARATION; PREPARATION OF SATURATED MACROCYCLIC KETONES; APPLICATION IN PERFUME AND FLAVOUR COMPOSITIONS OF SOME UNSATURATED MACROCYCLIC KETONES

摘要

Unsaturated 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 ……(RO)2-@-CH2-@-CH2-@(OR)2 (III)… wherein R represents an alkyl radical. …Preparation of unsaturated ketones of formula …… wherein R<1> represents a lower alkyl radial and n stands for 1 or 2, and ……