Use of unsaturated macrocyclic lactones as perfuming ingredients

A method to impart a musk-ambrette, fruity pear fragrance character to a perfuming composition or a perfumed article, which method comprises adding to said composition or article a fragrance effective amount of a perfuming agent consisting essentially of a trans-pentadecenolide of formula ##STR6## to impart said musk-ambrette, fruity pear fragrance character to said composition or perfumed article.

A method to impart a musk-ambrette, fruity pear fragrance character to a perfuming composition or a perfumed article, which method comprises adding to said composition or article a fragrance effective amount of a perfuming agent mixture containing a pentadecenolide of formula ##STR7## together with an equivalent or lesser amount of a pentadecenolide of formula ##STR8## to impart said musk-ambrette, fruity pear fragrance character to said composition or perfumed article.

A method to impart a musk-ambrette, fruity pear fragrance character to a perfuming composition or a perfumed article, which method comprises adding to said composition or article a fragrance effective amount of a mixture containing a predominant amount of pentadecenolides of formula ##STR9## having a double bond of trans configuration in one of the positions 11 or 12 such as indicated by the dotted lines, together with lesser amounts of a pentadecenolide of formula ##STR10## having a double bond of cis configuration in one of the positions indicated by the dotted lines to impart said musk-ambrette, fruity pear fragrance character to said composition or perfumed article.