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Related Concept Videos

SN1 Reaction: Mechanism02:25

SN1 Reaction: Mechanism

11.4K
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...
11.4K
E1 Reaction: Kinetics and Mechanism02:46

E1 Reaction: Kinetics and Mechanism

15.0K
Here, in contrast to the E2 reaction mechanism, we delve into the aspects of the E1 reaction mechanism, which has two steps: rate-limiting loss of the leaving group and abstraction of the beta hydrogen by a weak base. Typically, the experimental proof for the E1 mechanism is via kinetic studies or isotope studies. While the former demonstrates the first-order kinetics—the dependence of the reaction solely on substrate concentration—the latter proves the abstraction of hydrogen only...
15.0K
E2 Reaction: Kinetics and Mechanism02:45

E2 Reaction: Kinetics and Mechanism

9.7K
SN2 substitutions and E2 eliminations of alkyl halides proceed via a concerted pathway. While the nucleophile attacks the alpha carbon in SN2 reactions, it functions as a strong base and abstracts a beta hydrogen in the E2 mechanism. The rate-limiting transition state in E2 elimination reactions is characterized by partially broken carbon–hydrogen and carbon–halogen bonds and a partially formed pi bond between the alpha and beta carbons. The beta hydrogen and halide are eliminated...
9.7K
Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Overview01:20

Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Overview

17.7K
The Fischer esterification reaction was developed by the German chemist Emil Fischer in 1895. It is a condensation reaction between carboxylic acids and alcohols in an acidic medium to give esters and water.
17.7K
Alkylation of β-Diester Enolates: Malonic Ester Synthesis01:14

Alkylation of β-Diester Enolates: Malonic Ester Synthesis

3.3K
Malonic ester synthesis is a method to obtain α substituted carboxylic acids from ꞵ-diesters such as diethyl malonate and alkyl halides.
3.3K
E1 Reaction: Stereochemistry and Regiochemistry02:43

E1 Reaction: Stereochemistry and Regiochemistry

9.0K
One of the critical aspects of the E1 reaction mechanism, as also observed in E2, is the regiochemistry, with multiple regioisomers obtained as products. In the example discussed, the presence of water as a weak base favors elimination over substitution to generate two alkenes. Given that alkenes’ stability increases with the number of alkyl groups across the double bond, typically, E1 reactions lead to the Zaitsev product, for this is more substituted and stable than the Hofmann product.
9.0K

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Related Experiment Video

Updated: May 13, 2025

Double Emulsion Generation Using a Polydimethylsiloxane PDMS Co-axial Flow Focus Device
08:58

Double Emulsion Generation Using a Polydimethylsiloxane PDMS Co-axial Flow Focus Device

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One-Step Multiple Emulsions Driven by Interfacial Neutralization Reaction.

Jingwen Luo1, Mingshuo Cui1, Xiaodong Lian1,2

  • 1Key Laboratory of Advanced Light Conversion Materials and Biophotonics, School of Chemistry and Life Resources, Renmin University of China, Beijing 100872, PR China.

Langmuir : the ACS Journal of Surfaces and Colloids
|April 15, 2025
PubMed
Summary

This study introduces a one-step method for creating multiple emulsions using an interfacial acid-base reaction. This low-energy approach reduces emulsifier use and environmental impact, offering a sustainable alternative for various industries.

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Area of Science:

  • Colloid and Surface Science
  • Materials Chemistry
  • Green Chemistry

Background:

  • Multiple emulsions offer significant potential in cosmetics, food, and agriculture due to their complex structures and large interfacial areas.
  • Conventional methods for preparing multiple emulsions are energy-intensive and require substantial emulsifier usage, posing limitations and environmental concerns.

Purpose of the Study:

  • To develop a simple, efficient, and low-energy strategy for the one-step preparation of multiple emulsions.
  • To utilize an interfacial acid-base neutralization reaction as a driving force for spontaneous emulsification.
  • To reduce energy consumption and emulsifier dosage in multiple emulsion formation.

Main Methods:

  • Employing an interfacial acid-base neutralization reaction between oleic acid and ammonia to create a spontaneous emulsifying system.
  • Utilizing the reaction products as in-situ emulsifiers to stabilize both oil-in-water (O/W) and water-in-oil (W/O) interfaces.
  • Constructing oil-in-water-in-oil (O/W/O) multiple emulsions in a single step.

Main Results:

  • Successfully demonstrated a one-step method for producing multiple emulsions with an O/W/O structure.
  • Achieved emulsion formation through a spontaneous, low-energy process driven by interfacial neutralization.
  • Significantly reduced energy input and emulsifier requirements compared to traditional methods.
  • Minimized environmental issues associated with residual emulsifiers.

Conclusions:

  • The interfacial neutralization reaction provides an efficient, low-energy pathway for one-step multiple emulsion preparation.
  • This method offers a sustainable alternative to conventional emulsification techniques, reducing environmental impact.
  • The study promotes the development of advanced, low-surfactant emulsification strategies for industrial applications.