Protonation of the highly reactive 1:1 intermediates, produced in the reaction between (N-isocyanimino)triphenylphosphorane and dialkyl acetylenecarboxylates, by N-hydroxyimides leads to iminotriphenylphosphorane-containing salts, which undergo a reaction sequence including an addition, a proton transfer, and an elimination to produce the corresponding electron-poor O-vinyl derivatives in high yields under neutral conditions. The reaction is completely stereoselective.
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Ramazani et al. (2009) studied this question.
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