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Phosphodiester Linkages01:01

Phosphodiester Linkages

110.1K
Overview
Phosphodiester bond forms when a phosphoric acid molecule (H3PO4) links with two hydroxyl groups (–OH) of two other molecules, forming two ester bonds. Two water molecules are released in this process. The phosphodiester bond is commonly found in nucleic acids (DNA and RNA) and plays a critical role in their structure and function.
Phosphodiester Bonds Link Nucleotides Together
DNA and RNA are polynucleotides or long chains of nucleotides that are linked together. A nucleotide is...
110.1K
Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

3.3K
Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
3.3K
Nomenclature of Aryl and Heterocyclic Amines01:10

Nomenclature of Aryl and Heterocyclic Amines

3.0K
The simplest aromatic amine is phenylamine, which contains an –NH2 functionality directly attached to an aromatic ring. The name aniline is designated for this skeleton. As shown in Figure 1, the common names of the functionalized anilines involve prefixes ortho-, meta-, and para- to indicate the substitution position. Different functionalized aniline derivatives also have notable trivial names.
3.0K
Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

2.6K
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,...
2.6K
Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

3.6K
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para...
3.6K
Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions01:20

Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

2.4K
Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
2.4K

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Related Experiment Video

Updated: Jan 16, 2026

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI
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Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI

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Phosphaza-norbornanes.

Joseph Nazak1, Michael A Land1,2, Jason D Masuda3

  • 1Department of Chemistry, Dalhousie University, 6241 Alumni Crescent, Halifax, Nova Scotia, B3H 4R2, Canada. chitnis@uvic.ca.

Dalton Transactions (Cambridge, England : 2003)
|October 4, 2025
PubMed
Summary
This summary is machine-generated.

Researchers report the first isolation of phosphaza-norbornanes, novel bicyclic compounds with bridgehead phosphorus sites. These structures were synthesized using a modular condensation reaction and analyzed for their stability and electronic properties.

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Area of Science:

  • Organophosphorus chemistry
  • Organic synthesis
  • Bicyclic compounds

Background:

  • Phosphaza-norbornanes are a class of bicyclic compounds containing phosphorus.
  • Previous research has not definitively isolated these specific phosphaza-norbornane frameworks.

Purpose of the Study:

  • To report the first definitive isolation of phosphaza-norbornanes.
  • To investigate the synthesis, molecular structure, electronic properties, stability, and strain energy of these novel compounds.
  • To compare these properties with related bicyclic systems.

Main Methods:

  • Modular condensation reaction utilizing primary amines.
  • Spectroscopic analysis (e.g., NMR, Mass Spectrometry).
  • Computational methods for electronic structure and strain energy calculations.

Main Results:

  • Successful definitive isolation of phosphaza-norbornanes with a bicyclo[2.2.1]heptane skeleton.
  • Identification of bridgehead P(III) sites within the PN frameworks.
  • Characterization of molecular and electronic structures, stability, and strain energies.
  • Comparative analysis with related phosphaza-norbornane and hydrocarbon analogs.

Conclusions:

  • The modular condensation reaction provides a viable route to phosphaza-norbornanes.
  • These novel compounds exhibit unique structural and electronic features due to the bridgehead phosphorus.
  • Comparative studies offer insights into structure-property relationships in bicyclic organophosphorus systems.