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E2 Reaction: Kinetics and Mechanism02:45

E2 Reaction: Kinetics and Mechanism

12.9K
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...
12.9K
Weak Base Solutions03:21

Weak Base Solutions

25.9K
Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
25.9K
Crossed Aldol Reaction Using Weak Bases01:14

Crossed Aldol Reaction Using Weak Bases

2.7K
This lesson deals with the crossed aldol reaction using weak bases. The self-condensation of an aldehyde having α hydrogen is prevented by adding it slowly to a mixture of formaldehyde and weak bases like hydroxide and alkoxide. Upon slow addition of the aldehyde, the base deprotonates the α carbon of the aldehyde to form the corresponding enolate. The enolate subsequently attacks the formaldehyde to form a single crossed product. Figure 1 depicts the aforementioned reaction.
2.7K
The Small x Assumption02:20

The Small x Assumption

50.2K
If a reaction has a small equilibrium constant, the equilibrium position favors the reactants. In such reactions, a negligible change in concentration may occur if the initial concentrations of reactants are high and the Kc value is small. In such circumstances, the equilibrium concentration is approximately equal to its initial concentration.  This estimation can be used to simplify the equilibrium calculations by assuming that some equilibrium concentrations are equal to the initial...
50.2K
E1 Reaction: Kinetics and Mechanism02:46

E1 Reaction: Kinetics and Mechanism

18.1K
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...
18.1K
Factors Affecting α-Alkylation of Ketones: Choice of Base01:10

Factors Affecting α-Alkylation of Ketones: Choice of Base

3.7K
α-Alkylation of ketones is achieved in the presence of alkyl halides and a base. The reaction proceeds via the formation of an enolate ion followed by nucleophilic substitution. The choice of base employed is essential as it is the key factor in determining the reaction outcome.
The reaction involving bases like EtO− whose conjugate acid EtOH (pKa = 15.9) is stronger than the ketone (pKa = 19.2) results in an equilibrium mixture with higher ketone concentration. As a consequence,...
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Related Experiment Video

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Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
05:30

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Published on: September 8, 2023

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Algorithms for Lightweight Key Exchange.

Rafael Alvarez1, Cándido Caballero-Gil2, Juan Santonja3

  • 1Department of Computer Science and Artificial Intelligence, University of Alicante, 03690 Alicante, Spain. ralvarez@dccia.ua.es.

Sensors (Basel, Switzerland)
|June 28, 2017
PubMed
Summary
This summary is machine-generated.

Public-key cryptography is slow, but essential for secure communication. This study identifies efficient algorithms for critical infrastructure and mobile devices, proposing a new security framework for resilient networks.

Keywords:
elliptic curveinternet of thingskey exchangelightweight cryptographyprivacypublic-keysecuritysensor networks

Related Experiment Videos

Last Updated: Feb 27, 2026

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
05:30

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

Published on: September 8, 2023

1.2K

Area of Science:

  • Computer Science
  • Cryptography
  • Network Security

Background:

  • Public-key cryptography is computationally intensive, limiting its use in general encryption.
  • Secure protocols requiring forward secrecy heavily rely on public-key cryptography.
  • Low-powered and mobile devices, as well as critical infrastructure, demand lightweight cryptographic solutions.

Purpose of the Study:

  • To benchmark public-key key-exchange algorithms for efficiency.
  • To identify optimal algorithms for critical infrastructure and emergency applications.
  • To propose a security framework for decentralized networks using these algorithms.

Main Methods:

  • Benchmarking of various public-key key-exchange algorithms.
  • Performance analysis under constraints relevant to mobile and critical infrastructure.
  • Development and application study of a novel security framework.

Main Results:

  • Identification of specific public-key algorithms suitable for resource-constrained environments.
  • Demonstration of improved performance for key exchange in critical infrastructure scenarios.
  • Validation of the proposed security framework's applicability to decentralized node and sensor networks.

Conclusions:

  • Efficient public-key cryptography is achievable for demanding applications.
  • The proposed framework enhances security and resilience in critical infrastructure and emergency networks.
  • Lightweight cryptosystems are crucial for the future of secure, low-power, and mobile computing.