Butatrienedione is also detectable mass spectroscopically: electron impact ionization of 1 affords, via elimination of CO2 and Me2CO, the radical anion OC4O•⊖, which can be converted by vertical charge reversal into the corresponding cation. In neutralization-reionization experiments, starting from both species it was possible to obtain the neutral molecule.
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Sülzle et al. (1990) studied this question.
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