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Related Concept Videos

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

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All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
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Directing Effect of Substituents: ortho–para-Directing Groups01:14

Directing Effect of Substituents: ortho–para-Directing Groups

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Ortho–para directors are substituent groups attached to the benzene ring and direct the addition of an electrophile to the positions ortho or para to the substituent. All electron-donating groups are considered ortho–para directors. They donate electrons to the ring and make the ring more electron-rich. The ring is therefore susceptible to the addition of electrophiles. Substituents such as amino, hydroxy, or alkoxy, containing lone pairs on the atom adjacent to the ring, donate...
9.5K
ortho–para-Directing Deactivators: Halogens01:24

ortho–para-Directing Deactivators: Halogens

7.1K
Halogens are ortho–para directors. They are more electronegative than carbon. Therefore, as ring substituents, they can withdraw electrons through the inductive effect and deactivate the aromatic ring towards electrophilic substitution. Halogens also have an electron-donating resonance effect on the ring, which influences the orientation of the incoming electrophile. If an electrophile attacks at the ortho or the para position, the halogen donates electrons and stabilizes the intermediate...
7.1K
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

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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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Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene01:13

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

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Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
8.0K
π Molecular Orbitals of 1,3-Butadiene01:24

π Molecular Orbitals of 1,3-Butadiene

12.7K
Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...
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Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
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β-Functionalized Push-Pull opp-Dibenzoporphyrins.

R G Waruna Jinadasa1, Yuanyuan Fang2, Siddhartha Kumar1

  • 1Department of Chemistry and Biochemistry, Miami University , 701 E High Street, Oxford, Ohio 45056, United States.

The Journal of Organic Chemistry
|November 19, 2015
PubMed
Summary

Researchers synthesized novel push-pull dibenzoporphyrins with tunable electronic properties. These porphyrins exhibit unique spectral features and near-infrared emission, with potential applications in advanced materials and therapies.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Photochemistry

Background:

  • Dibenzoporphyrins are versatile macrocycles with tunable optoelectronic properties.
  • Push-pull systems are crucial for developing advanced functional materials.

Purpose of the Study:

  • To synthesize novel β-functionalized push-pull dibenzoporphyrins.
  • To investigate the structure-property relationships of these new porphyrins.
  • To explore their potential applications in various fields.

Main Methods:

  • Synthesis of β-functionalized push-pull dibenzoporphyrins.
  • UV-vis and fluorescence spectroscopy for property characterization.
  • Trifluoroacetic acid (TFA) titration to study fluorescence quenching mechanisms.

Main Results:

  • Successful synthesis of push-pull dibenzoporphyrins with tunable electronic and electrochemical properties.
  • Observed unique absorption patterns (shouldered Soret bands, Q-band absorptions) and strong near-infrared emission (600-850 nm).
  • Demonstrated fluorescence quenching in pyridyl-containing porphyrin 4c upon acid addition, attributed to pyridyl protonation.

Conclusions:

  • The developed synthetic methods provide access to a wide range of functionalized organic materials.
  • Structure-property insights guide the design of next-generation materials for dye-sensitized solar cells, nonlinear optics, fluorescence probes, and photodynamic therapy.