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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
Hydrolysis of Chlorobenzene to Phenol: Dow Process01:10

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Simple aryl halides do not react with nucleophiles under normal conditions. However, the reaction can proceed under drastic conditions involving high temperatures and high pressure to give the substituted products. For example, chlorobenzene is converted to phenol using aqueous sodium hydroxide at 350 °C under high pressure by the Dow process. The reaction follows an elimination-addition mechanism involving a benzyne intermediate. Here, the chloride ion is eliminated to generate the benzyne...
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

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 overlap of p...
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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 with both...
Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview01:32

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Cyanohydrins are compounds that contain –CN and –OH groups on the same carbon atom. They are formed by the nucleophilic addition of the cyanide ions to the carbonyl group. Cyanide ions are highly basic and nucleophilic and can be generated from HCN under aqueous conditions. However, since HCN is a weak acid, the number of cyanide ions generated is very small. Hence, a small amount of base or KCN/NaCN is added to HCN to increase the concentration of the cyanide ions in the reaction mixture.
Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism01:10

Aldehydes and Ketones with HCN: Cyanohydrin Formation Mechanism

Cyanohydrins are formed when cyanide nucleophiles and carbonyl compounds like aldehydes and ketones react. A strong base, the cyanide ion, catalyzes cyanohydrin formation. The ions are generated from HCN under aqueous conditions. Once the cyanide ions are generated, the first step involves the nucleophilic attack of the cyanide ions on the electrophilic carbonyl carbon. This attack shifts the π electrons from the C=O to the oxygen atom forming the alkoxide ion intermediate. The alkoxide anion...

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Cyclopentadecanone 2,4-dinitrophenylhydrazone.

Eric A Noe1, Diwakar M Pawar, Frank R Fronczek

  • 1Department of Chemistry, Jackson State University, 1400 J. R. Lynch Street, Jackson, MS 39217-0510, USA.

Acta Crystallographica. Section C, Crystal Structure Communications
|March 7, 2008
PubMed
Summary
This summary is machine-generated.

This study details the crystal structure of a C(21)H(32)N(4)O(4) compound. The 15-membered hydrocarbon ring adopts an unsymmetrical conformation, with the dinitrophenylhydrazone group oriented perpendicularly.

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Area of Science:

  • Crystallography
  • Organic Chemistry
  • Molecular Structure

Background:

  • Understanding the three-dimensional arrangement of atoms in organic molecules is crucial for predicting their properties and reactivity.
  • Detailed structural analysis provides fundamental insights into molecular interactions and conformations.

Purpose of the Study:

  • To elucidate the precise molecular structure and conformation of the title compound, C(21)H(32)N(4)O(4).
  • To investigate the spatial relationship between the hydrocarbon ring and the 2,4-dinitrophenylhydrazone substituent.

Main Methods:

  • Single-crystal X-ray diffraction analysis was employed to determine the molecular structure.
  • The conformation of the 15-membered hydrocarbon ring was analyzed.

Main Results:

  • The title compound, C(21)H(32)N(4)O(4), exhibits no crystallographic disorder.
  • The 15-membered hydrocarbon ring adopts an unsymmetrical quinquangular [12345] conformation.
  • The 2,4-dinitrophenylhydrazone group is positioned nearly perpendicular to the hydrocarbon ring, with a dihedral angle of 84.66 (1) degrees.

Conclusions:

  • The study provides a definitive structural characterization of the C(21)H(32)N(4)O(4) compound.
  • The observed conformation highlights specific stereochemical features relevant to organic molecular design.