Issue Date: July 21, 2014
Caged Lithium Speeds Fullerene Cycloadditions
To get more zip out of Diels-Alder reactions, chemists often employ a Lewis acid catalyst to starve the cycloaddition’s dienophile of electron density as it seeks out the electron-rich diene. One problem with this approach is that a heteroatom is needed in the dienophile to coordinate with certain Lewis acids, such as lithium ions. This coordination adds a steric component to the reaction, making it difficult to separate electronic and steric effects when teasing out . . .
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