Abstract
Three anion isomers of formula C7H have been synthesised in the mass spectrometer by unequivocal routes. The structures of the isomers are [HCCC(C2)2]−, C6CH− and C2CHC4−. One of these, [HCCC(C2)2]−, is formed in sufficient yield to allow it to be charge stripped to the corresponding neutral radical.
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