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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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Catalysis

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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.
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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.
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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Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride01:26

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Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
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Esters to Carboxylic Acids: Saponification01:25

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Esters can be hydrolyzed to carboxylic acids under acidic or basic conditions. Base-promoted hydrolysis of esters is a nucleophilic acyl substitution reaction in which esters react with an aqueous base, followed by an acid to give carboxylic acids. This reaction is also known as saponification because it forms the basis for making soaps from fats.
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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
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Updated: May 30, 2025

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Bio-Based Surfactants via Borrowing Hydrogen Catalysis.

Maximilian Koy1, Maximilian Fellert1, Chuting Deng2

  • 1Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 3, 9747 AG, Groningen, The, Netherlands.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|January 31, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a sustainable method for creating bio-based surfactants from amino acids and alcohols. This efficient, single-step process yields versatile surfactants with potential for biodegradability, offering a greener alternative.

Keywords:
Borrowing hydrogenFoaming agentGreen chemistrySurfactantsSustainability

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Area of Science:

  • Green Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • Traditional surfactant production often involves harsh chemicals and multiple steps.
  • There is a growing demand for sustainable and bio-based alternatives in the chemical industry.
  • Amino acids and alcohols are abundant and renewable feedstocks.

Purpose of the Study:

  • To develop a novel, efficient, and sustainable method for synthesizing bio-based surfactants.
  • To explore the derivatization of these surfactants into advanced structures like Gemini surfactants.
  • To evaluate the surfactant properties and biodegradability of the synthesized compounds.

Main Methods:

  • A borrowing hydrogen strategy was employed for surfactant synthesis.
  • Ubiquitous amino acids and common alcohols were used as starting materials.
  • A commercially available ruthenium-based catalyst facilitated a single-step, waste-free reaction with high atom economy.

Main Results:

  • Bio-based surfactants were successfully synthesized in a single step without protecting group manipulations.
  • The synthesized surfactants demonstrated versatility through further derivatization into novel Gemini surfactants and quaternary ammonia salts.
  • Selected compounds exhibited remarkable surfactant properties and potential for biodegradability.

Conclusions:

  • The borrowing hydrogen approach offers a highly efficient and sustainable route to bio-based surfactants.
  • The developed method provides access to novel surfactant structures with desirable properties.
  • These sustainable surfactants hold significant potential for broad applications due to their performance and environmental profile.