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SN1 Reaction: Mechanism02:25

SN1 Reaction: Mechanism

12.5K
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...
12.5K
SN2 Reaction: Mechanism02:27

SN2 Reaction: Mechanism

15.0K
The kinetic studies of SN2 reactions suggest an essential feature of its mechanism: it is a single-step process without intermediates. Here, both the nucleophile and the substrate participate in the rate-determining step.
The presence of the more electronegative halogen in the substrate creates a polarized carbon-halide bond. The halide pulls the electron cloud generating an electrophilic center at the carbon atom. Thus, the carbon atom carries a partial positive charge while the halide has a...
15.0K
Reaction Mechanisms03:06

Reaction Mechanisms

27.2K
Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
27.2K
E2 Reaction: Kinetics and Mechanism02:45

E2 Reaction: Kinetics and Mechanism

10.8K
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...
10.8K
E1 Reaction: Kinetics and Mechanism02:46

E1 Reaction: Kinetics and Mechanism

15.9K
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...
15.9K
Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism01:26

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism

3.7K
The Hofmann and Curtius rearrangement reactions can be applied to synthesize primary amines from carboxylic acid derivatives such as amides and acyl azides. In the Hofmann rearrangement, a primary amide undergoes deprotonation in the presence of a base, followed by halogenation to generate an N-haloamide. A second proton abstraction produces a stabilized anionic species, which rearranges to an isocyanate intermediate via an alkyl group migration from the carbonyl carbon to the neighboring...
3.7K

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Related Experiment Video

Updated: Oct 5, 2025

Synthesis of Hypervalent Iodonium Alkynyl Triflates for the Application of Generating Cyanocarbenes
12:27

Synthesis of Hypervalent Iodonium Alkynyl Triflates for the Application of Generating Cyanocarbenes

Published on: September 8, 2013

11.0K

One Soai reaction, two mechanisms?

Yannick Geiger1

  • 1Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands. y.geiger@rug.nl.

Chemical Society Reviews
|January 24, 2022
PubMed
Summary
This summary is machine-generated.

The Soai reaction

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Chemoselective Preparation of 1-Iodoalkynes, 1,2-Diiodoalkenes, and 1,1,2-Triiodoalkenes Based on the Oxidative Iodination of Terminal Alkynes
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Last Updated: Oct 5, 2025

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Chemoselective Preparation of 1-Iodoalkynes, 1,2-Diiodoalkenes, and 1,1,2-Triiodoalkenes Based on the Oxidative Iodination of Terminal Alkynes
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Area of Science:

  • Organic Chemistry
  • Chemical Kinetics
  • Asymmetric Synthesis

Background:

  • The mechanism of the Soai reaction, a chiral symmetry breaking process, has been debated for over 25 years.
  • The reaction combines autocatalysis with asymmetric amplification, leading to a chiral product from achiral starting materials.

Purpose of the Study:

  • To compare two proposed mechanisms for the Soai reaction: the tetrameric product alkoxide aggregate (SMS tetramer) and the product-substrate dimer (hemiacetal).
  • To discuss the implications of these proposed mechanisms on the fundamental understanding of asymmetry-amplifying autocatalysis.

Main Methods:

  • In-depth comparison of experimental data from the Denmark and Trapp studies.
  • Analysis of previously reported data on the Soai reaction.

Main Results:

  • The two proposed models for the Soai reaction mechanism (tetrameric alkoxide aggregate vs. product-substrate dimer) may not be mutually exclusive.
  • The validity of each model might depend on the specific substrates used in the studies.

Conclusions:

  • Reconciling the proposed mechanisms offers new insights into the fundamental understanding of asymmetry-amplifying autocatalysis.
  • Further research is needed to fully elucidate the catalytic species and mechanism across different substrates.