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Disubstituted Cyclohexanes: cis-trans Isomerism02:37

Disubstituted Cyclohexanes: cis-trans Isomerism

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Depending upon the different spatial orientation of the substituents, the disubstituted cycloalkanes exhibit two types of stereoisomers. The cis isomers have the substituents on the same side of the ring, whereas the trans isomers have the substituents on the opposite sides. These stereoisomers exhibit different physical properties and cannot be interconverted without breaking the carbon-carbon bonds.
In cyclohexane, the substituents can occupy different positions generating distinct isomers....
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Structure of Benzene: Kekulé Model01:07

Structure of Benzene: Kekulé Model

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In 1865, August Kekule suggested the structure of benzene according to the structural theory of organic chemistry based on the three assertions—formula of benzene is C6H6, all the hydrogens of benzene are equivalent, and each carbon must have four bonds due to its tetravalency.
He proposed that benzene has a cyclic structure of six carbon atoms attached to one hydrogen atom each, with three alternating pi bonds.
9.2K
Structure of Conjugated Dienes01:16

Structure of Conjugated Dienes

5.2K
Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
5.2K
Structures of Carboxylic Acid Derivatives01:28

Structures of Carboxylic Acid Derivatives

2.7K
Structure of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the...
2.7K
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
meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H01:13

meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H

5.6K
All meta-directing substituents are deactivating groups. These substituents withdraw electrons from the aromatic ring, making the ring less reactive toward electrophilic substitution. For example, the nitration of nitrobenzene is 100,000 times slower than that of benzene because of the deactivating effect of the nitro group. The first step in an electrophilic aromatic substitution is the addition of an electrophile to form a resonance-stabilized carbocation. The energy diagrams for...
5.6K

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Sensitive 1,4-Disubstituted Nitro-Containing Cubanes: Structures and Properties.

Andreas Bartonek1, Thomas M Klapötke1, Burkhard Krumm1

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The Journal of Organic Chemistry
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Cubane derivatives show high strain energy, making them promising for energetic materials. Researchers developed a new synthesis for cubane-1,4-dicarboxylic acid dimethyl ester and its energetic derivatives.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Energetic Materials

Background:

  • Cubane cage systems possess high strain energy.
  • This characteristic makes them suitable precursors for energetic materials.
  • 1,4-Disubstituted cubanes are readily accessible derivatives.

Purpose of the Study:

  • To present a developed laboratory-scale procedure for cubane-1,4-dicarboxylic acid dimethyl ester.
  • To synthesize and characterize novel energetic cubane derivatives.
  • To investigate the physical and energetic properties of these new compounds.

Main Methods:

  • Laboratory-scale synthesis of cubane-1,4-dicarboxylic acid dimethyl ester.
  • Synthesis of bis-trinitroethyl and bis-nitromethyl esters, bis-methylcarbamate, and bis-methylnitrocarbamate derivatives.
  • Characterization using multinuclear NMR spectroscopy and X-ray crystallography.
  • Determination of physical and energetic properties.

Main Results:

  • A refined laboratory procedure for cubane-1,4-dicarboxylic acid dimethyl ester was established.
  • Several novel energetic cubane derivatives were successfully synthesized and characterized.
  • The physical and energetic properties of the synthesized compounds were evaluated.

Conclusions:

  • The developed synthetic route provides access to valuable energetic cubane derivatives.
  • The characterized compounds demonstrate potential for applications in energetic materials.
  • Further studies on the properties and applications of these cubane derivatives are warranted.