1,3-Dipolar Cycloaddition

The 1,3-dipolar cycloaddition is a chemical reaction between a 1,3-dipole and a dipolarophile to form a five-membered ring. The earliest 1,3-dipolar cycloadditions were described in the late 19th century to the early 20th century, following the discovery of 1,3-dipoles. Mechanistic investigation and synthetic application were established in the 1960s, primarily through the work of Rolf Huisgen. Hence, the reaction is sometimes referred to as the Huisgen cycloaddition, although this term is often used to specifically describe the 1,3-dipolar cycloaddition between an organic azide and an alkyne to generate 1,2,3-triazole. Currently, 1,3-dipolar cycloaddition is an important route to the regio- and stereoselective synthesis of five-membered heterocycles and their ring-opened acyclic derivatives.



Read more about 1,3-Dipolar CycloadditionMechanistic Overview, Frontier Molecular Orbital Theory, Reactivity, Stereospecificity, Diastereoselectivity, Regioselectivity

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1,3-Dipolar Cycloaddition - Regioselectivity - Product Orientation
... there are general guidelines for orientation of products, the actual selectivity in these cycloaddition reactions is varied ...