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Basicity of Heterocyclic Aromatic Amines01:25

Basicity of Heterocyclic Aromatic Amines

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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).
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The basicity of aromatic amines is much weaker than that of aliphatic amines due to the involvement of the lone pair of electrons over the N atom in resonance with the aryl rings. Generally, the electron-donating ability of any substituents on the aryl ring of aromatic amines increases the basicity of the amine by increasing electron density, and hence the availability of lone pair on the nitrogen. On the other hand, electron-withdrawing functional groups on the aryl ring of amines decrease the...
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Diels–Alder Reaction: Characteristics of Dienophiles01:24

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In a Diels–Alder reaction, the diene is usually an electron-rich system and acts as a nucleophile, whereas the dienophile is electron-deficient and functions as an electrophile. Much like the diene, the nature of the dienophile significantly impacts the outcome of the reaction. 
Characteristics of Dienophiles
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Adrenergic Agonists: Chemistry and Structure-Activity Relationship01:16

Adrenergic Agonists: Chemistry and Structure-Activity Relationship

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Adrenergic agonists' structure-activity relationship (SAR) determines their selectivity and efficacy. These agonists comprise a phenylethylamine moiety with an aromatic ring and an ethylamine side chain.
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When disubstituted benzenes undergo electrophilic substitution, the product distribution depends on the directing effect of both substituents. When the directing effects of both substituents reinforce each other, a single product is obtained. For example, bromination of p-nitrotoluene occurs ortho to the methyl group and meta to the nitro group, which is the same position, resulting in a single product. However, if the directing effects of the two groups oppose each other, the...
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Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
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1,7-Dithienyl BODIPYs: do thienyls outperform phenyls?

Andrii H Hotynchan1, Vladyslav M Polishchuk1, Svitlana V Shishkina1

  • 1Institute of Organic Chemistry NAS of Ukraine, Akademika Kukharya Street 5, Kyiv, 02094, Ukraine. kovtun@ioch.kiev.ua.

Organic & Biomolecular Chemistry
|November 27, 2025
PubMed
Summary

Researchers developed a modified Grob-Camenish method to synthesize novel NH, α-CH pyrroles. These pyrroles were used to create unique dithienyl BODIPY dyes with tunable properties, expanding synthetic chemistry possibilities.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Photochemistry

Background:

  • Pyrroles are important heterocyclic compounds with diverse applications.
  • Developing efficient synthetic routes for substituted pyrroles is crucial for materials development.
  • BODIPY dyes are known for their strong fluorescence and photostability.

Purpose of the Study:

  • To explore nitrostyrene-based approaches for synthesizing NH, α-CH pyrroles.
  • To develop a modified Grob-Camenish procedure for preparing pyrroles with specific substituents.
  • To synthesize and characterize novel dithienyl BODIPY dyes and compare their properties with phenyl analogues.

Main Methods:

  • Utilized nitrostyrene-based approaches, including modified Gómez-Sánchez and Grob-Camenish methods.
  • Synthesized NH, α-CH pyrroles with electron-rich arene substituents.
  • Prepared 1,7-dithienyl BODIPY dyes from thiophene-substituted pyrroles and performed post-functionalization.

Main Results:

  • A modified Grob-Camenish procedure successfully synthesized previously inaccessible NH, α-CH pyrroles.
  • Thiophene-substituted BODIPY dyes were synthesized and characterized.
  • Detailed investigation of thiophene-substituted chromophores using X-ray diffraction, spectroscopy, and computational methods.

Conclusions:

  • The modified Grob-Camenish method offers a new route to functionalized pyrroles.
  • Thiophene-substituted BODIPY dyes exhibit distinct properties compared to phenyl analogues.
  • This study expands the scope of BODIPY dye synthesis and characterization.