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

Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride

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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.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation reactions,...
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SN2 Reaction: Kinetics02:14

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Kinetic Studies and Significance
In a chemical reaction, a relationship exists between the concentration of reactants and the rate at which the reaction proceeds. The study to measure this relationship is known as the kinetics of a chemical reaction. Kinetic studies are used to deduce the rate law of a chemical reaction, which provides information about the species involved during the transition state of the rate-determining step. Thus, kinetic studies help to derive the mechanism of a...
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SN1 Reaction: Mechanism02:25

SN1 Reaction: Mechanism

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Kinetic studies of ionization of a tertiary halide in a protic solvent suggest that only the substrate participates in the rate-determining step (slow step). The nucleophile is involved only after the slowest step. The SN1 reaction takes place in a multiple-step mechanism. 
Firstly, the haloalkane ionizes to generate a carbocation intermediate and a halide ion. This heterolytic cleavage is highly endothermic with large activation energy. The ionization of the substrate, facilitated by a...
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Electrophilic Aromatic Substitution: Nitration of Benzene01:20

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The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.
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Predicting Products: SN1 vs. SN202:27

Predicting Products: SN1 vs. SN2

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Nucleophilic substitution reactions of alkyl halides can proceed via an SN1 or an SN2 mechanism. While in SN2 reactions, the nucleophile attacks the substrate simultaneously as the leaving group departs, in SN1 reactions, the substrate first dissociates to give the carbocation intermediate. Various factors such as the structure of the substrate, the strength of the nucleophile, and the nature of the solvent promote one mechanism over the other.
With increased substitution on the alkyl halide,...
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Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Microdroplets Catalyze C(sp2)-H Nitration Reactions.

Shengkai Chen1, Ziying Qi1, Ke Dong1

  • 1College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou, 311121, Zhejiang, People's Republic of China.

Organic Letters
|December 16, 2025
PubMed
Summary

This study introduces a microdroplet method for greener organic synthesis, improving nitration reactions. Adding TfOH enhances yields and scalability for producing nitrated compounds.

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Area of Science:

  • Organic Chemistry
  • Green Chemistry
  • Sustainable Synthesis

Background:

  • Microdroplet chemistry offers unique catalytic and redox environments at the gas-liquid interface, promoting sustainable organic synthesis.
  • Traditional nitration methods often require large amounts of nitric acid, harsh conditions (high temperatures, long durations), and specific catalysts, posing sustainability challenges.

Purpose of the Study:

  • To develop a more efficient and milder method for nitration reactions using microdroplet chemistry.
  • To overcome the limitations of scale and conversion in catalyst-free microdroplet nitration.

Main Methods:

  • Development of a catalyst-free microdroplet method for nitration.
  • Optimization of the microdroplet nitration by introducing triflic acid (TfOH) at the molar scale.
  • Evaluation of substrate scope and scalability for the optimized nitration process.

Main Results:

  • Catalyst-free microdroplet nitration achieved good conversions (up to 61%) but was limited to the micromolar scale.
  • The addition of 1 equivalent of TfOH enabled nitration of 11 (hetero)arenes with yields ranging from 53-98% at the molar scale.
  • The optimized method demonstrated high scalability (1.06 g h⁻¹) with short reaction times and broad substrate applicability.

Conclusions:

  • The TfOH-mediated microdroplet nitration presents an attractive, scalable, and efficient alternative for synthesizing nitrated (hetero)arenes.
  • This approach addresses the sustainability concerns associated with traditional nitration techniques.
  • The method's efficiency, mild conditions, and gram-scale capability make it valuable for organic synthesis.