The Cadiot–Chodkiewicz coupling in organic chemistry is a coupling reaction between a terminal alkyne and a haloalkyne catalyzed by a copper(I) salt such as copper(I) bromide and an amine base. The reaction product is a di-acetylene or di-alkyne.
The reaction mechanism involves deprotonation by base of the acetylenic proton followed by formation of a copper(I) acetylide. A cycle of oxidative addition and reductive elimination on the copper center then creates a new carbon-carbon bond.
Related couplings are the Glaser coupling and the Eglinton coupling.
In one study the Cadiot–Chodkiewicz coupling has been applied in the synthesis of acetylene macrocycles starting from cis-1,4-diethynyl-1,4-dimethoxycyclohexa-2,5-diene. This compound is also the starting material for the dibromide through NBS and silver nitrate:
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- Synthesis of 1,4-Cyclohexadiene-Based Acetylenic Macrocycles with Cadiot–Chodkiewicz Coupling. Structure of a Tub-Shaped Tetrameric Container Arkasish Bandyopadhyay, Babu Varghese, and Sethuraman Sankararaman J. Org. Chem.; 2006; 71(12) pp 4544–48; (Article) doi:10.1021/jo0605290
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