Collision-induced dissociations of negative ions. α-Dicarbonyl parent negative ions

Abstract

α-Dicarbonyl compounds form stable parent negative ions by capture of low-energy electrons. The parent negative ions undergo a variety of collision induced dissociations, the most characteristic being β cleavage to a carbonyl group, i.e.

see diagram in paper

Cyclic α-dicarbonyl parent negative ions may also eliminate molecules of carbon monoxide, for example the fragmentations M- → [M-(R + CO)]^- M- →[M - (R-2CO)]^- and M^- → [M-2CO]^- occur in a number of cases.