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- W2073284196 abstract "Abstract The relative losses of unlabelled vs. labelled HCN from the [M] + ˙ and [M – 1] + ions of a number of specifically labelled 1‐methylimidazoles (I) and 1‐methylpyrazoles (II) have been determined. Hydrogen randomisation in the molecular ions prior to fragmentation is insignificant. Expulsion of HCN follows two distinct pathways: elimination involving positions 2 and 3 (predominant in I) and elimination involving the methyl group and the nitrogen atom at position 1 (predominant in II). The molecular ions eject H˙ from the methyl groups to a high degree of specificity. In both cases some contribution by position 5 is observed. The resultant [M – 1] + ions exhibit extensive, but incomplete hydrogen randomisation. Loss of HCN from these ions is consistent with intermediacy of ring‐expanded ions, but notably in II a proportion of the HCN is generated from the group. A mechanism for this observation is presented." @default.
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- W2073284196 date "1973-10-01" @default.
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- W2073284196 title "Fragmentation behaviour and ring expansion of 1-methylimidazole and 1-methylpyrazole upon electron-impact" @default.
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- W2073284196 doi "https://doi.org/10.1002/oms.1210071005" @default.
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