Abstract
AbstractPolysubstituted olefins as attractive and useful compounds are generally acquired by traditional acid or metal catalyzed system. Herein, a convenient and environmentally friendly method using acidic ionic liquid as a metal‐free catalyst and dimethyl carbonate (DMC) as a green solvent has been demonstrated to synthesize polysubstituted olefins through construction of new C−C bonds by activating of ethers and alkenes. In the system, the usage of metal, halogen, traditional toxic solvents, and a large number of additives was avoided, neutralization after the reaction was not required, and waste production was reduced. The system was suitable for benzyl ethers and styrene derivatives, and recyclable [MeBs(dio)TMP][OTf] exhibited best activity. Density functional theory (DFT) calculations suggest synergistic functions of the cation and anion of ILs and show hydrogen bonds and π‐π stacking interactions between catalyst and substrates, which can lead to lower barriers.
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