| Autor: |
Lu, Xingkai, Li, Yan, He, Xinyuan, Song, Pengfei, Chai, Zhigang |
| Předmět: |
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| Zdroj: |
Chemistry - A European Journal; 7/25/2024, Vol. 30 Issue 42, p1-6, 6p |
| Abstrakt: |
Light‐driven carboxylation offers a promising approach for synthesizing valuable fine chemicals under mild conditions. Here we disclose a heterogeneous photocatalytic strategy of C(sp2)−H activation of formate for hydrocarboxylation of alkenes over zinc indium sulfide (ZnIn2S4) under visible light. This protocol functions well with a variety of substituted styrenes with good to excellent yields; it also works for unactivated alkenes albeit with lower yields. Mechanistic studies confirm the existence of CO2⋅− as a key intermediate. It was found that C(sp2)−H activation of formate is induced by S⋅ species on the surface of ZnIn2S4 via hydrogen atom transfer (HAT) instead of a photogenerated hole oxidation mechanism. Moreover, both cleavage of the C(sp2)−H of HCOO− and formation of a benzylic anion were found to be involved in the rate‐determining step for the hydrocarboxylation of styrene. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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