Radical‐cations of iminopropadienones (RNCCCO +˙ ) have been generated by dissociative ionization of isoxazle precursors a structurally characterized by collisional activation mass spectrometry; the corresponding neutral cumulenes have also been produced in a tandem mass spectrometer by neutralization and/or flash‐vacuum pyrolysis experiments.
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Flammang et al. (1992) studied this question.
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