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PYRIDINE THEORY
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This reaction forms organolithiums from a halogenated pyridine. Organolithics allow the attack of very varied carbon electrophiles, such as: primary alkyl halides, aldehydes, ketones, nitriles, esters, epoxides...

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a) Alkylation of pyridinyl lithium

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b) Reaction with aldehydes and ketones

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c) Opening of oxacyclopropanes

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d) Reaction with nitriles

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