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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.
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The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
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Oxymercuration–reduction of alkenes is one of the major reactions converting alkenes to alcohols. It involves the hydration of alkenes with mercuric acetate in a mixture of tetrahydrofuran and water, forming an organomercury adduct. This is followed by a demercuration step in which the adduct is reduced to an alcohol using sodium borohydride.
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By replacing an α-hydrogen with a halogen, acid-catalyzed α-halogenation of aldehydes or ketones yields a monohalogenated product
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Nucleophilic acyl substitution is an important class of substitution reactions involving a nucleophile and an acyl compound, such as carboxylic acids and their derivatives. In these reactions, the leaving group attached to the acyl group is substituted by a nucleophile. The general mechanism proceeds via two steps.
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Updated: Jul 30, 2025

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Catalytic Deracemization Reactions.

Mouxin Huang1,2, Tianrun Pan1, Xieyang Jiang1

  • 1Center of Basic Molecular Science, Department of Chemistry, Tsinghua University, Beijing 100084, China.

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|May 13, 2023
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Catalytic deracemization converts racemates to single enantiomers efficiently. This perspective explores chemical, photo-, and mechanical energy inputs for this advanced asymmetric synthesis technique.

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Area of Science:

  • Organic Chemistry
  • Asymmetric Synthesis
  • Catalysis

Background:

  • Deracemization offers atomic economy and efficiency in converting racemates to single enantiomers without intermediate separation.
  • This process faces thermodynamic and kinetic challenges, requiring precise energy input and reaction design.
  • Catalytic strategies combined with external energy sources are emerging to achieve nonspontaneous enantioenrichment.

Purpose of the Study:

  • To review and categorize catalytic deracemization strategies.
  • To highlight the role of exogenous energy sources in deracemization.
  • To discuss future perspectives in the field.

Main Methods:

  • Categorization of deracemization methods based on energy source: chemical (redox), photo-, and mechanical energy.
  • Analysis of catalytic features and underlying mechanisms for each energy input.
  • Literature review of recent advancements in catalytic deracemization.

Main Results:

  • Identified chemical, photo-, and mechanical energy as key drivers for catalytic deracemization.
  • Detailed the mechanisms by which these energy sources facilitate enantioenrichment.
  • Highlighted the importance of catalyst design and reaction conditions.

Conclusions:

  • Catalytic deracemization is a promising approach for efficient enantiomer production.
  • Exogenous energy input is crucial for overcoming limitations in deracemization.
  • Further research into novel catalytic systems and energy inputs will advance the field.