Abstract

The distonic radical cation HC + (OH)OĊH 2, an isomer of ionized methyl formate HC(O)OCH + 3, has been generated from fragmentation of ionized isobutyl formate and ionized 2-methylbutyl formate and characterized by collisional activation (CA) and neutralization—reionization (NR) mass spectrometries. A mixture of both methyl formate and distonic radical cations has been detected following ionization of methyl formate. MO calculations at the UHF/6-31G ** level showed that the distonic species is more stable its conventional isomer and that the energy difference between both isomers is essentially due to the difference of the OH and CH energies.

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