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Related Concept Videos

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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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Naming Amides
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Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.
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The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.
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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...
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Carbocations

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Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
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1-Nitro-9H-carbazole.

Paul Kautny1, Berthold Stöger2

  • 1Institute for Applied Synthetic Chemistry, Division Organic Chemistry, Vienna University of Technology, Getreidemarkt 9/163-OC, A-1060 Vienna, Austria.

Acta Crystallographica. Section E, Structure Reports Online
|February 15, 2014
PubMed
Summary
This summary is machine-generated.

This study details the crystal structure of a C12H8N2O2 molecule, revealing a slight tilt in the nitro group relative to the carbazole moiety. Molecules form dimers through hydrogen bonds, arranging into layers within the crystal lattice.

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Area of Science:

  • Crystallography
  • Molecular structure analysis
  • Organic chemistry

Background:

  • Carbazole derivatives are important in materials science and medicinal chemistry.
  • Understanding molecular packing and intermolecular interactions is crucial for predicting material properties.

Purpose of the Study:

  • To elucidate the crystal structure and intermolecular interactions of a specific C12H8N2O2 molecule.
  • To analyze the spatial arrangement and hydrogen bonding patterns in the solid state.

Main Methods:

  • Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
  • Analysis of bond lengths, bond angles, and intermolecular contacts was performed.

Main Results:

  • The crystal structure of C12H8N2O2 was determined, with a nitro group exhibiting a slight tilt (4.43(9)°) relative to the carbazole moiety.
  • Molecules self-assemble into centrosymmetric dimers through N-H⋯O hydrogen bonds.
  • These dimers are further organized into layered structures parallel to the (10-1) crystallographic plane.

Conclusions:

  • The study provides detailed insights into the solid-state packing of this carbazole derivative.
  • The observed hydrogen bonding and layered arrangement are key factors influencing the molecule's physical properties.