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→Mechanism: Swapped mechanism figure to 2 Cu mechanism which is described in the text and is now the generally accepted mechanism. |
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In the uncatalysed reaction the alkyne remains a poor electrophile. Thus high energy barriers lead to slow reaction rates.<ref>{{cite journal |author1=V. D. Bock |author2=H. Hiemstra |author3=J. H. van Maarseveen | title = CuI-Catalyzed Alkyne–Azide "Click" Cycloadditions from a Mechanistic and Synthetic Perspective | year = 2006 | journal = [[European Journal of Organic Chemistry]] | pages = 51–68 | doi = 10.1002/ejoc.200500483 | volume = 2006}}</ref>
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===Ligand assistance===
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