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Related Concept Videos

Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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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...
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Disubstituted Cyclohexanes: cis-trans Isomerism02:37

Disubstituted Cyclohexanes: cis-trans Isomerism

15.1K
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....
15.1K
Parkinson's Disease: Treatment01:24

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Neurodegenerative disorders, such as Parkinson's Disease (PD), involve the gradual and irreversible destruction of neurons in particular brain areas. These disorders exhibit standard features like proteinopathies, selective vulnerability of some neurons, and an interaction of intrinsic properties, genetics, and environmental influences in neural injury.
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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...
17.4K
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

4.3K
Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
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A Tricyclic Hexaphosphane.

Jonas Bresien1, Axel Schulz2,3, Alexander Villinger1

  • 1Institut für Chemie, Universität Rostock, Albert-Einstein-Straße 3a, 18059 Rostock (Germany).

Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 15, 2015
PubMed
Summary

Researchers discovered a novel Mes*P6 Mes* compound through a unique ring expansion reaction involving a functionalized cyclo-tetraphosphane and Lewis bases. This finding expands the known chemistry of phosphorus compounds.

Keywords:
4-(N,N-dimethylamino)pyridineLewis baseNMR spectroscopyphosphorus compoundspolycyclic phosphanesstructure elucidation

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Area of Science:

  • Organophosphorus chemistry
  • Inorganic chemistry
  • Synthetic chemistry

Background:

  • Cyclo-tetraphosphanes are known phosphorus ring structures.
  • Functionalized phosphanes can undergo complex reactions.
  • Lewis bases are crucial in mediating chemical transformations.

Purpose of the Study:

  • To synthesize and characterize a novel phosphorus compound.
  • To investigate the reaction mechanism of cyclo-tetraphosphane derivatives.
  • To explore the formation of unusual phosphorus ring systems.

Main Methods:

  • Reaction of [ClP(μ-PMes*)]2 with various Lewis bases.
  • Spectroscopic analysis (e.g., NMR, Mass Spectrometry).
  • Theoretical calculations (e.g., DFT) to elucidate reaction pathways.

Main Results:

  • Formation of an unprecedented tricyclic hexaphosphane, Mes*P6 Mes*.
  • Identification of an unusual ring expansion mechanism.
  • Comprehensive characterization of the novel hexaphosphane structure.

Conclusions:

  • The reaction of functionalized cyclo-tetraphosphanes with Lewis bases can lead to novel phosphorus allotropes.
  • Ring expansion is a viable pathway for constructing complex phosphorus cages.
  • The Mes*P6 Mes* compound represents a new structural motif in organophosphorus chemistry.