Abstract: The mechanisms of formation of the major negative ions produced in the collision- induced fragmentations of the enolate ion of heptan-cone have been studied by using a series of D-and 13C-labeled compounds. H atom loss is specific, involving position 3 (relative to the enolate position, 5). Methane elimination, the most abundant collision- generated fragment ion, largely involves the 1 (7) C& group together with a hydrogen ...
