The present invention relates to the field of perfumery and concerns the use as perfuming ingredient of ketones of formula wherein n represents 0, 1 or 2, m represents 0, 1 or 2, the dotted lines represent only single bonds or one double bond and two single bonds, R.sup.1 represents a hydrogen atom or a methyl or ethyl group, said R.sup.1 group being located at any of the position of the cyclic moiety, R.sup.2 represents a C.sub.1-C.sub.3 O-alkyl or O-alkenyl group or a substituted or unsubstituted ethylene or cyclopropyl group. Said compounds are useful to impart a clean and natural fruity, pineapple odor type. The present invention concerns also the compositions or articles containing said compounds (I) as well as some of said compounds (I). ##STR00001##

Provided are a fluorine-containing compound suitable to produce rubber having both excellent short-term and long-term heat resistance, a fluorine-containing copolymer using such a compound, and a fluorine-containing copolymer composition. A fluorine-containing compound represented by formula (1) below, a fluorine-containing copolymer using such a compound, and a fluorine-containing copolymer composition. In formula (1), R.sup.1 to R.sup.3 are each independently a hydrogen atom or a fluorine atom; R.sup.4 is a hydrogen atom, a fluorine atom, or a C.sub.1-8 monovalent organic group free from a carbonyl group; Z is an oxygen atom, a sulfur atom, or N(R.sup.5) where R.sup.5 is a hydrogen atom or a C.sub.1-4 monovalent organic group; X is a single bond or a difluoromethylene group; Y.sup.1 to Y.sup.4 are each independently a fluorine atom or a trifluoromethyl group; and Q is a C.sub.1-8 perfluoroalkylene group optionally containing an etheric oxygen atom.

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