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In page Hammick reaction:
"Upon heating α-picolinic acid will spontaneously decarboxylate forming the so-called 'Hammick Intermediate' (2), which can be viewed as an aromatic ylide.[1] In the presence of a strong electrophile, such as an aldehyde or ketone, this species will undergo nucleophilic attack faster than protonation. After nucleophilic attack intramolecular proton transfer yields the desired carbinol (4).
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