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Related Concept Videos

Nucleophiles02:30

Nucleophiles

The word “nucleophile” has a Greek root and translates to nucleus-loving. Nucleophiles are either negatively charged or neutral species with a pair of electrons in a high-energy occupied molecular orbital (HOMO). As these species tend to donate electron pairs, nucleophiles are considered Lewis bases as well. Negatively charged species, like OH−, Cl−, or HS−, with one or several pairs of electrons, are typically nucleophiles. Similarly, neutral species such as ammonia, amines, water, and alcohol...
Electrophiles02:28

Electrophiles

This lesson explains the definition, classification, and characteristic features of an electrophile that are key features of nucleophilic substitution reactions. An analysis of their charge and orbital picture helps understand their reactivity for seeking electrons. Electrophiles can be classified into positive and neutral species. Other classes include free radicals and polar functional groups.
While a positive electrophile, like a proton, reacts due to its vacant, low-energy 1s orbital, the...
Carbocations02:10

Carbocations

Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo, or cyano...
Nucleophilic Aromatic Substitution: Elimination–Addition01:11

Nucleophilic Aromatic Substitution: Elimination–Addition

Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is confirmed through isotopic...
Nucleophilic Substitution Reactions02:34

Nucleophilic Substitution Reactions

Historical perspective
In 1896, the German chemist Paul Walden discovered that he could interconvert pure enantiomeric (+) and (-) malic acids through a series of reactions. This conversion suggested the involvement of optical inversion during the substitution reaction. Further, in 1930, Sir Christopher Ingold described for the first time two different forms of nucleophilic substitution reactions, which are known as SN1 (nucleophilic substitution unimolecular) and SN2 (nucleophilic substitution...

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A Protocol for Safe Lithiation Reactions Using Organolithium Reagents
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A Protocol for Safe Lithiation Reactions Using Organolithium Reagents

Published on: November 12, 2016

Nucleophilic cationization reagents.

Souvik Biswas1, Xuan Huang, Wesley R Badger

  • 1Department of Chemistry, University of Louisville, Louisville, KY 40292, United States.

Tetrahedron Letters
|March 6, 2010
PubMed
Summary
This summary is machine-generated.

New aminooxy-functionalized tetraalkylammonium iodides were synthesized. These novel nucleophilic cationization reagents enable the creation of advanced cationic materials through oximation reactions.

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Area of Science:

  • Organic Chemistry
  • Materials Science

Background:

  • Aminooxy groups are versatile functional groups in organic synthesis.
  • Tetraalkylammonium salts are widely used as phase-transfer catalysts and ionic liquids.

Purpose of the Study:

  • To develop novel nucleophilic cationization reagents incorporating aminooxy functionalities.
  • To synthesize and characterize mono- and bis-aminooxy tetraalkylammonium iodides, including functionalized analogs.
  • To demonstrate the utility of these reagents in the synthesis of cationic materials.

Main Methods:

  • Synthesis of novel mono- and bis-aminooxy tetraalkylammonium iodides.
  • Characterization of synthesized compounds.
  • Application of reagents in oximation reactions for material synthesis.

Main Results:

  • Successful synthesis of various aminooxy-functionalized tetraalkylammonium iodides.
  • Demonstration of N-hydroxyethyl-functionalized analogs.
  • Oximation reaction successfully employed to create cationic materials.

Conclusions:

  • The developed aminooxy-functionalized tetraalkylammonium iodides are effective nucleophilic cationization reagents.
  • These reagents offer a practical route for synthesizing diverse cationic materials.
  • The methodology provides a valuable tool for materials science and organic synthesis.