通过二核催化,二元化-水利化,通过二核催化形成替代的1,3-二烯
Ke Chen1,2, Hongdan Zhu3, Shuxin Jiang1
1State Key Laboratory of Organometallic Chemistry and Shanghai Hongkong Joint Laboratory in Chemical Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, P. R. China.
Nature communications
|March 30, 2025
概括
迪尼克尔催化使内部基因的选择性二分化-碳水化合物功能化成为可能,产生具有挑战性的酸替代1,3-基因. 这种双核融合催化方法提供了与传统单金属方法不同的新型反应性.
科学领域:
- 有机金属化学 有机金属化学
- 催化科学 催化科学
背景情况:
- 单金属催化剂在同质催化中普遍存在,反应发生在单个金属位点.
- 酶和异质催化剂中的双金属活性位点激发了用于新型反应性的双核催化剂的开发.
- 传统的单金属催化与基二元化-碳水化合物功能化作斗争,通常产生单基合并.
研究的目的:
- 为了实现高度选择性的二分化-碳化合物功能化内部基.
- 为了合成具有挑战性的酸替代1,3-dienes.
- 探索双核催化对新型反应途径的潜力.
主要方法:
- 在反应中使用迪尼克尔催化剂.
- 进行机理学研究以阐明反应途径.
- 使用内部基因作为基质.
主要成果:
- 实现了高度选择性的二分化-碳化合物功能化内部基.
- 成功合成了酸替代的1,3-dienes.
- 提出了一种机制,涉及每个Ni位点的不同作用,形成一个二维尼尔二-Ni中间体.
结论:
- 迪尼克尔催化使得一种新的催化方式成为可能.
- 双核融合催化剂的发生.
- 这种方法与单金属方法不同.
- 这项研究为原子和分子层面的双核协同效应提供了新的见解.
- 开发的方法为合成有价值的酸替代1,3-二烯提供了一条新途径.
相关概念视频
02:50Catalysis
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
02:13Reduction of Alkenes: Catalytic Hydrogenation
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.
The hydrogenation process takes place on the surface of...
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.
The hydrogenation process takes place on the surface of...
02:17Reduction 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...
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...
02:34Preparation of Alkynes: Dehydrohalogenation
Introduction
Alkynes can be prepared by dehydrohalogenation of vicinal or geminal dihalides in the presence of a strong base like sodium amide in liquid ammonia. The reaction proceeds with the loss of two equivalents of hydrogen halide (HX) via two successive E2 elimination reactions.
Alkynes can be prepared by dehydrohalogenation of vicinal or geminal dihalides in the presence of a strong base like sodium amide in liquid ammonia. The reaction proceeds with the loss of two equivalents of hydrogen halide (HX) via two successive E2 elimination reactions.
02:47Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.