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Related Concept Videos

Preparation of Alkynes: Alkylation Reaction02:27

Preparation of Alkynes: Alkylation Reaction

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Introduction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
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Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

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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.
The hydrogenation process takes place on the...
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Aldehydes and Ketones with Amines: Imine Formation Mechanism01:23

Aldehydes and Ketones with Amines: Imine Formation Mechanism

6.4K
Imine formation involves the addition of carbonyl compounds to a primary amine. It begins with the generation of carbinolamine through a series of steps involving an initial nucleophilic attack and then several proton transfer reactions. The second part includes the elimination of water, as a leaving group, to give the imine.
Imines are formed under mildly acidic conditions. A pH of 4.5 is ideal for the reaction.
If the pH is low or the solution is too acidic, the reaction slows down in the...
6.4K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

8.1K
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.
8.1K
Amines to Alkenes: Hofmann Elimination01:16

Amines to Alkenes: Hofmann Elimination

2.7K
Alkenes can be obtained from amines via an E2 elimination. The amine is first converted into a good leaving group, such as a quaternary ammonium salt. This is accomplished by treating the amine with an excess of alkyl halide, which results in a halide salt. Next, the halide salt is transformed into a hydroxide salt that functions as a base to enable elimination.
Under thermal conditions, the hydroxide can abstract a proton from the β carbon; this generates an alkene with the simultaneous...
2.7K
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

2.0K
Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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Sustainable Imine Production Using Alkanes as Substrates via a Plasma-Microdroplet Approach.

Shuang Sun1, Yijie Fu1, Xiangrui Bu2

  • 1Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China.

Journal of the American Chemical Society
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This study introduces a novel plasma-microdroplet method for converting alkanes into imines. This green chemistry approach efficiently activates inert C-H bonds under mild conditions, offering a sustainable alternative for chemical synthesis.

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Area of Science:

  • Synthetic Chemistry
  • Green Chemistry
  • Plasma Science

Background:

  • Direct alkane functionalization is a significant challenge.
  • Conventional methods often require harsh conditions.
  • Sustainable alternatives are needed for inert substrate transformation.

Purpose of the Study:

  • To develop an efficient method for converting alkanes into imines.
  • To utilize plasma-microdroplet technology for C-H bond activation.
  • To establish a mild and sustainable synthetic route.

Main Methods:

  • Integrated plasma-microdroplet system.
  • Nonthermal plasma discharge in a nitrogen atmosphere for C-H activation.
  • Electrosprayed microdroplets for capturing intermediates and transimination with primary amines.

Main Results:

  • Selective activation of inert C-H bonds and generation of N-insertion intermediates.
  • High efficiency conversion of alkanes to imines via microdroplet-accelerated transimination.
  • Real-time mass spectrometry confirmed a two-step mechanism.

Conclusions:

  • The plasma-microdroplet approach enables efficient alkane-to-imine conversion under mild conditions.
  • This method offers a green alternative to traditional thermal catalysis.
  • Synergistic combination of plasma activation and microdroplet dynamics is key to success.