The mass spectra of some ozonides are reported, and the modes of formation of the major fragment ions tentatively described. The use of 180-labelled compounds has proven to be useful in establishing fragmentation patterns. It is concluded that these follow a characteristic path, which is common to all the ozonides studied and permits mass spectrometric identification.Les spectres de masse d'une serie d'ozonides sont rapport& ainsi qu'une rationalisation des modes de fragmentation conduisant aux principaux ions. Dans certains cas, des ozonides marques avec 180 ont servi a etablir plus fermement les divers modes de fragmentation. I1 s'avGre que tous les produits Ctudiks se decomposent par impact tlectronique, selon un mode qui leur est caracteristique et qui perlnet leur identification par spectromktrie de masse.
Triphenylphosphine has been found to reduce "0 labelled ozonides of styrene, stilbene, p-methylstyrene, and triphenylethylene by a very selective attack on the peroxidic oxygen atonls of the ozonides. The presence of an electron withdraning phenyl group attached to a C atoll1 of the ozonide ring enhances the attack on the peroxidic oxygen adjacent to this C atom, \?;hereas the presence of an electron releasing methyl group enhances the attack on the other peroxidic oxqgen atom.La reduction, par la tripl~Cnylphospl~ine, des ozonides ~L I styrene, stilbene, p-methylstyrene et du triphinylethylene, marques par 180 dans la position ether, iuontre que I'attaque a lieu tres selective~nent sur les oxygenes peroxpdiques. Le groupe phenyle, relie a un atome de carbone du noyau ozonique, favorise l'attaque siir l'atome d'oxygene peroxydique voisin a cet atome de carbone. Le groupe niethyle exerce une influence contraire.
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