Add time:07/26/2019         Source:sciencedirect.com

Sonogashira cross-coupling of 2-chloro-3-iodopyridines with buta-1,3-diynes gave products of only iodine substitution; in the case of 2-bromo-3-iodopyridine either 2-bromo-3-(buta-1,3-diynyl)- or 2,3-bis(buta-1,3-diynyl)pyridines were obtained depending on the reaction conditions.

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