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Related Concept Videos

Nomenclature of Aryl and Heterocyclic Amines01:10

Nomenclature of Aryl and Heterocyclic Amines

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.
Physical Properties of Amines01:26

Physical Properties of Amines

Amines with low molecular weight are usually gaseous at room temperature, while those with high molecular weight are liquid or solids in nature. Usually, low molecular weight amines have a rotten fish-like smell. Diamines typically have a pungent smell. For instance, cadaverine and putrescine, depicted in Figure 1, are two molecules responsible for decaying tissue.
Biosynthesis of Nucleic Acids01:28

Biosynthesis of Nucleic Acids

Nucleic acid biosynthesis is a fundamental biochemical process that produces the purine and pyrimidine nucleotides essential for DNA and RNA synthesis. This pathway maintains a balanced nucleotide pool, preventing imbalances that could jeopardize genetic integrity and cellular function. Given the crucial role of nucleotides, their synthesis is tightly regulated to ensure proper cellular homeostasis.Purine BiosynthesisThe biosynthesis of purine nucleotides begins with ribose-5-phosphate, a...
Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

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 position.
Basicity of Heterocyclic Aromatic Amines01:25

Basicity of Heterocyclic Aromatic Amines

Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
IUPAC Nomenclature of Aldehydes01:16

IUPAC Nomenclature of Aldehydes

Aldehydes are named based on the systematic nomenclature rules set by the IUPAC. For acyclic aldehydes, the longest carbon chain containing the aldehydic (–CHO) group is considered the parent chain. The aldehyde is named by replacing the last letter “e” in the hydrocarbon name with “al”. For instance, a simple, seven-carbon-membered acyclic aldehyde is called heptanal, derived from heptane. The carbon chain is numbered starting from the aldehydic carbon, although the aldehydic carbon’s locant...

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Naphthiporphyrins.

Timothy D Lash1, Alexandra M Young, Jane M Rasmussen

  • 1Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States. tdlash@ilstu.edu

The Journal of Organic Chemistry
|May 25, 2011
PubMed
Summary
This summary is machine-generated.

Naphthiporphyrins, a new class of porphyrin analogues, were synthesized and studied. While some naphthiporphyrins showed enhanced aromaticity and diatropicity as predicted, steric factors in certain structures reduced these effects.

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Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Benziporphyrins are cross-conjugated porphyrin analogues featuring a benzene ring.
  • Their macrocyclic aromaticity varies due to the need for conjugation.
  • Naphthalene analogues (naphthiporphyrins) were proposed to enhance aromaticity.

Purpose of the Study:

  • To synthesize and characterize naphthiporphyrins.
  • To investigate their aromaticity and diatropicity compared to benziporphyrins.
  • To explore their potential in organometallic chemistry.

Main Methods:

  • Synthesis via MacDonald condensation using naphthalenedicarbaldehydes and tripyrrane.
  • Oxidation using DDQ (2,3-dichloro-5,6-dicyano-1,4-benzoquinone).
  • Characterization using NMR spectroscopy, X-ray crystallography, and complexation with palladium(II) and silver(I).

Main Results:

  • Naphthiporphyrin dications exhibited significant diatropic ring currents.
  • Palladium(II) and silver(III) complexes of naphthiporphyrins were successfully prepared.
  • Oxynaphthiporphyrins showed slightly enhanced diatropicity over oxybenziporphyrins.
  • A specific 1,4-naphthiporphyrin isomer displayed reduced diatropicity due to steric hindrance.

Conclusions:

  • Naphthiporphyrins can exhibit enhanced aromatic properties as hypothesized.
  • Steric interactions within certain naphthiporphyrin structures can reduce macrocyclic planarity and diatropicity.
  • These findings highlight the complex interplay of electronic and steric factors in porphyrin analogue design.