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Updated: Jun 5, 2025

Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
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Published on: June 21, 2017

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合理设计的横向冷凝催化剂在乙烯化中为乙烯生产提供了强大的活性和选择性

Zehua Li1, Eylül Öztuna1,2, Katarzyna Skorupska3

  • 1Department of Inorganic Chemistry, Fritz-Haber Institute of the Max Planck Society, Berlin, Germany.

Nature communications
|December 10, 2024
PubMed
概括

新的碳 (Pd:C) 催化剂为将二氧化碳 (CO2) 转化为乙烯等有价值产品提供了更高的选择性. 在催化中取得的这一突破使得有效的碳管理和可持续的化学生产成为可能.

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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
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Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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