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SN1 Reaction: Kinetics

S_N1 Reaction: Kinetics

In an SN2 reaction, the reaction rate depends on both the type of nucleophile and the substrate. A hindered tertiary alkyl halide is practically inert to the SN2 mechanism despite using a strong nucleophile.
However, Sir Christopher Ingold and Edward D. Hughes, who studied the kinetics of various nucleophilic substitution reactions, noticed that a tertiary alkyl halide does undergo a nucleophilic substitution reaction in the presence of a weak nucleophile. While studying the substitution...

SN2 Reaction: Kinetics

S_N2 Reaction: Kinetics

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...

E2 Reaction: Kinetics and Mechanism

E2 Reaction: Kinetics and Mechanism

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...

E1 Reaction: Kinetics and Mechanism

E1 Reaction: Kinetics and Mechanism

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...

Enzyme Kinetics

Enzyme Kinetics

Enzymes speed up reactions by lowering the activation energy of the reactants. The speed at which the enzyme turns reactants into products is called the rate of reaction. Several factors impact the rate of reaction, including the number of available reactants. Enzyme kinetics is the study of how an enzyme changes the rate of a reaction.
Scientists typically study enzyme kinetics with a fixed amount of enzyme in the controlled environment of a test tube. When more reactant, or substrate, is...

Reaction Mechanisms

Reaction Mechanisms

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:

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Related Experiment Video

Updated: Jan 27, 2026

Reaction Kinetics and Combustion Dynamics of I4O9 and Aluminum Mixtures

Reaction Kinetics and Combustion Dynamics of I4O9 and Aluminum Mixtures

Published on: November 7, 2016

Using Microfluidics and Imaging SAMDI-MS To Characterize Reaction Kinetics.

Jennifer Grant¹, Patrick T O'Kane¹, Blaise R Kimmel¹

¹Department of Chemistry, Department of Chemical & Biological Engineering, and Department of Biomedical Engineering, Northwestern University, Evanston, Illinois 60208, United States.

ACS Central Science

|April 3, 2019

Summary

This study presents a microfluidic device using functionalized monolayers to measure chemical reaction rates. The method enables time-resolved monitoring of reactions within microfluidic channels for broader applications.

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Last Updated: Jan 27, 2026

Reaction Kinetics and Combustion Dynamics of I4O9 and Aluminum Mixtures

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Published on: November 7, 2016

A Microfluidic Platform for Longitudinal Imaging in Caenorhabditis elegans

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Hot Biological Catalysis: Isothermal Titration Calorimetry to Characterize Enzymatic Reactions

Hot Biological Catalysis: Isothermal Titration Calorimetry to Characterize Enzymatic Reactions

Published on: April 4, 2014

Area of Science:

Biochemistry
Analytical Chemistry
Chemical Engineering

Background:

Microfluidic platforms offer reagent reduction for biochemical assays.
Current product analysis methods limit microfluidic applications.
A need exists for advanced reaction monitoring in microfluidics.

Purpose of the Study:

To demonstrate a microfluidic device for measuring chemical reaction rate constants.
To establish a label-free method for studying dispersive reaction processes.
To expand microfluidic applications in chemical reaction monitoring.

Main Methods:

A microfluidic device with a functionalized self-assembled monolayer was designed.
Reactants were mixed and selectively immobilized to the monolayer in a time-dependent manner.
Imaging self-assembled monolayers for matrix-assisted laser desorption/ionization mass spectrometry (iSAMDI-MS) was employed for quantitative imaging.

Main Results:

The device enabled time-resolved monitoring of reaction progress within the microfluidic channel.
Quantitative images of reaction progression were acquired using iSAMDI-MS.
The chemical reaction rate constant was determined by analyzing surface immobilization and fluid front characteristics.

Conclusions:

This approach expands the applicability of microfluidics for chemical reaction monitoring.
A label-free method was established for studying processes in a dispersive regime.
The developed microfluidic device offers a simplified approach to biochemical assay analysis.