Transfert d'Hétéroatomes (Cl,Br, OH) lors de la Fragmentation d'Acétyléniques δ-Fonctionnalisés

The mass spectra of three δ-functionalized alkynes provide evidence for the migration of chlorine, bromine and hydroxyl towards the unsaturated portion of the molecules. The strong resemblance between these spectra and those of the isomeric allenes suggests that an acetylene→allene isomerization occurs after electron impact.