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The formation of the styryl ion {article}{empty}{document}PhCH = C⁺ H{document} in the mass spectra of some cinnamic compounds is shown to occur via the intermediate formation of the cinnamoyl ion {article}{empty}{document}Ph - CH = CH - C ≡ O⁺{document} rather than by direct cleavage of the bond α to the double bond.
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Brittain et al. (1969) studied this question.
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