Carboxylate anions, collision-induced

In a very detailed study, using a combined theoretical/experimental approach. Squires et examined the gas phase properties of isomeric C3H5 anions. They were able to generate stable alkyl, 2-propenyl, 1-propenyl and cyclopropyl anions, as well as parent vinyl anions, in the gas phase by collision induced dissociation of the corresponding carboxylate anions, using the reaction sequence in Scheme 36 which was monitored by Fourier transform mass spectrometry. 

Alkyl anions in the gas phase have been generated by collision-induced decarboxylation of carboxylate anions. 

Hvattum, E., Hagelin, G. and Larsen, A., Study of mechanisms involved in the collision-induced dissociation of carboxylate anions from glycerophosphohpids using negative ion electrospray tandem quadrupole mass spectrometry. Rapid Commun. Mass Spectrom., 12, 1405-1409 (1998). 

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