Dibromoethane chemical ionization mass spectra of ten pairs of methyl (E)‐ and (Z)‐cinnamates were studied. C2H4Br+ ion forms stable adducts with E‐isomers and the adducts of Z‐isomers show preferential loss of methanol. The observed results suggest that the probability of ring alkylation is greater than with the carbonyl group.
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Vairamani et al. (1991) studied this question.
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