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Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
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Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
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Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
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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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Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
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(E)-N'-(4-Hydroxy-benzyl-idene)-2-methoxy-benzohydrazide.

Xue-Hui Zhan1

  • 1College of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha 410076, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online
|January 5, 2011
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This study details the E configuration of a C(15)H(14)N(2)O(3) compound, revealing specific molecular geometry and crystal packing via hydrogen bonding. The research highlights intramolecular and intermolecular interactions influencing crystal structure.

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Area of Science:

  • Organic Chemistry
  • Crystallography
  • Molecular Structure

Background:

  • Understanding molecular configurations and intermolecular interactions is crucial in chemistry.
  • Crystal structure analysis provides insights into material properties and chemical bonding.

Purpose of the Study:

  • To characterize the molecular structure and crystal packing of a specific organic compound, C(15)H(14)N(2)O(3).
  • To investigate the stereochemistry, specifically the E configuration around the methyl-idene unit.
  • To analyze the hydrogen bonding network within the crystal lattice.

Main Methods:

  • X-ray crystallography was employed to determine the three-dimensional structure.
  • Analysis of bond lengths, bond angles, and dihedral angles to define molecular geometry.
  • Identification and analysis of intra- and intermolecular hydrogen bonds.

Main Results:

  • The compound C(15)H(14)N(2)O(3) was confirmed to possess E configuration.
  • A dihedral angle of 22.0(2)° was measured between the two substituted benzene rings.
  • An intramolecular N-H⋯O hydrogen bond was observed.
  • Intermolecular O-H⋯O hydrogen bonds form zigzag chains along the b direction in the crystal structure.

Conclusions:

  • The study provides a detailed structural description of the title compound.
  • The identified hydrogen bonding patterns are key features of its crystal packing.
  • This structural information is valuable for understanding the compound's physical and chemical properties.