Abstract
Abstract The crystal structures of the cyclic adduct 1 of 4-quinolinone with methyl isocyanate and its dehydrogenated derivative 2 have been determined by X-ray crystal structure analysis. Both crystal structure data of the C–N bond lengths in the triazinedione-ring skeleton suggest which bonds are broken in the initial EI mass fragmentation followed by the subsequent loss of a neutral MeNCO moiety.
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