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The mass spectral and pyrolytic dissociations of o‐nitroanisole are reported. The parent ion dissociates by two pathways, principally through loss of CH2O, but a significant fraction through loss of NO. The parent‐less‐30 peak is therefore a doublet, as shown by high resolution measurements. The thermal decomposition at 600°C and above proceeds also by two pathways, but these are the loss of HNO and HNO2, to form 1,2‐methylenedioxybenzene and benzaldehyde respectively.
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Mamer et al. (1970) studied this question.
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