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Related Concept Videos

Acidity of 1-Alkynes02:42

Acidity of 1-Alkynes

9.9K

The acidic strength of hydrocarbons follows the order: Alkynes > Alkenes > Alkanes. The strength of an acid is commonly expressed in units of pKa — the lower the pKa, the stronger the acid. Among the hydrocarbons, terminal alkynes have lower pKa values and are, therefore, more acidic. For example, the pKa values for ethane, ethene, and acetylene are 51, 44, and 25, respectively, as shown here.
9.9K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

2.9K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
2.9K
Structure and Physical Properties of Alkynes02:37

Structure and Physical Properties of Alkynes

10.9K
Introduction:
In nature, compounds containing both carbon and hydrogen are known as "hydrocarbons". Aliphatic hydrocarbons are compounds whose molecules contain saturated single bonds (i.e., alkanes) or unsaturated double or triple bonds. Alkenes contain carbon–carbon double bonds and have a structural formula CnH2n. Unsaturated hydrocarbons containing carbon–carbon triple bonds are called "alkynes" and are structurally represented by the formula CnH2n-2.
The...
10.9K
Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

12.7K
This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
12.7K
Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

3.5K
Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
3.5K
Nomenclature of Alkynes02:39

Nomenclature of Alkynes

18.6K
Alkynes are unsaturated hydrocarbons characterized by the presence of carbon-carbon triple bonds and have a general formula CnH2n-2. The nomenclature of alkynes follows a set of rules similar to alkanes and alkenes; however, alkynes bear the suffix "-yne" instead of "-ane" or "-ene." There are two approaches to naming alkynes:
18.6K

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Updated: Aug 3, 2025

Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
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Pyridone-Doped Acenes with Improved Stability.

Chengguo Yan1, Weiwei Ding1, Gang Zhang1

  • 1Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Products, College of Chemical Engineering, Nanjing Forestry University, Longpan Road 159, Nanjing, 210037, P. R. China.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|April 7, 2023
PubMed
Summary

Researchers synthesized pyridone-doped acenes up to heptacene, enhancing stability for organic electronics. The study explored pyridone

Keywords:
acenesacridoneheteroacenesheterocyclespolycyclic aromatic hydrocarbons

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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
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Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
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Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
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Area of Science:

  • Organic electronics
  • Materials science
  • Synthetic chemistry

Background:

  • Heteroatom incorporation in acenes enhances stability for organic electronics.
  • 4-pyridone is a stable unit found in acridone and quinacridone.
  • Decorating higher acenes with pyridone for stability remains unexplored.

Purpose of the Study:

  • To synthesize and investigate monopyridone-doped acenes up to heptacene.
  • To explore the effect of pyridone doping on acene properties.
  • To assess the stability and electronic characteristics of these novel materials.

Main Methods:

  • Palladium-catalyzed Buchwald-Hartwig amination.
  • Synthesis of monopyridone-doped acenes (up to heptacene).
  • Experimental and computational property investigations.

Main Results:

  • Successful synthesis of a series of monopyridone-doped acenes.
  • Pyridone doping enhances solution stability of acenes.
  • Weakened conjugation and gradual loss of aromaticity observed with π-extension.
  • Maintained electronic communication between acene planes.

Conclusions:

  • Monopyridone doping offers a strategy to improve acene stability.
  • Pyridone's electronic influence on acenes varies with π-extension.
  • These doped acenes show promise for organic electronic applications.