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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

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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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α-Halogenation of aldehydes and ketones is a reaction involving the substitution of α hydrogens with halogens in the presence of a base.  The reaction begins with the abstraction of  α hydrogen by the base to produce a nucleophilic enolate ion. This intermediate undergoes a subsequent nucleophilic substitution with the halogen to produce a monohalogenated carbonyl compound. If the starting substrate has more than one α hydrogen, it is difficult to stop the reaction...
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Introduction
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Reduction of Alkenes: Catalytic Hydrogenation02:13

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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.
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Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
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A method involving the transformation of methyl ketones to carboxylic acids using excess base and halogen is called the haloform reaction. It begins with the deprotonation of α hydrogen to form an enolate ion which reacts with the electrophilic halogen to give an α-halo ketone. The step continues until all the α protons are substituted to form a trihalomethyl ketone. The resulting molecule is unstable, and in the presence of a hydroxide base, it readily undergoes nucleophilic...
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Toward a mild dehydroformylation using base-metal catalysis.

Dylan J Abrams1, Julian G West1, Erik J Sorensen1

  • 1Department of Chemistry , Princeton University , Princeton , NJ 08544 , USA . Email: ejs@princeton.edu ; http://www.chemists.princeton.edu/sorensen.

Chemical Science
|April 29, 2017
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Summary
This summary is machine-generated.

Researchers developed a novel base-metal catalyst for mild dehydroformylation, producing alkenes from aldehydes. This method avoids harsh conditions and precious metals, offering a sustainable alternative to existing processes.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Sustainable Chemistry

Background:

  • Dehydroformylation, the conversion of aldehydes to alkenes, hydrogen, and carbon monoxide, is an industrially relevant but underdeveloped reaction.
  • Nature utilizes oxidative dehydroformylation for sterol biosynthesis using base-metal catalysts under mild conditions.
  • Current chemical methods for non-oxidative dehydroformylation require high temperatures and precious-metal catalysts.

Purpose of the Study:

  • To design a mild dehydroformylation method utilizing base-metal catalysis.
  • To combine the advantages of natural oxidative dehydroformylation and existing chemical methods.
  • To overcome the limitations of high temperatures and precious-metal catalysts in dehydroformylation.

Main Methods:

  • Investigated both natural oxidative dehydroformylation and existing chemical non-oxidative dehydroformylation approaches.
  • Designed a novel catalytic system based on cooperative base metal catalysis.
  • Focused on achieving mild reaction conditions.

Main Results:

  • Developed a base-metal catalyzed method for dehydroformylation under mild conditions.
  • Demonstrated the effectiveness of cooperative base metal catalysis for challenging transformations.
  • Avoided the need for high temperatures and precious-metal catalysts.

Conclusions:

  • Cooperative base metal catalysis offers a powerful and mechanistically unique approach to dehydroformylation.
  • The developed method provides a more sustainable and efficient alternative to current dehydroformylation processes.
  • This work advances the field of catalysis by enabling difficult reactions with earth-abundant metals.