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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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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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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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Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
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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...
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N'-[(E)-2-Fluoro-benzyl-idene]benzo-hydrazide.

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This study details the crystal structure of C14H11FN2O, revealing two independent molecules adopting an E conformation. Molecular structure and crystal packing were elucidated through hydrogen bonding and pi-pi interactions.

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Area of Science:

  • Crystallography
  • Organic Chemistry
  • Materials Science

Background:

  • Understanding molecular conformation and crystal packing is crucial for predicting material properties.
  • The specific compound C14H11FN2O presents an interesting case for structural analysis due to its functional groups.

Purpose of the Study:

  • To determine the precise three-dimensional structure of the title compound, C14H11FN2O.
  • To investigate the intermolecular interactions governing its crystal packing.

Main Methods:

  • Single-crystal X-ray diffraction was employed to analyze the crystal structure.
  • Analysis of bond lengths, bond angles, dihedral angles, and intermolecular contacts (hydrogen bonds, van der Waals forces, pi-pi interactions).

Main Results:

  • The asymmetric unit contains two independent molecules, both exhibiting E conformation around the azomethine bond.
  • Non-planar molecular geometry with significant dihedral angles between aromatic rings.
  • Crystal structure features N-H⋯O=C and N-H⋯N hydrogen bonds forming chains, and C-H⋯O contacts forming layers.
  • Stabilized three-dimensional crystal packing facilitated by pi-pi interactions with a shortest centroid separation of 3.884 Å.

Conclusions:

  • The study provides a detailed structural characterization of C14H11FN2O.
  • The identified hydrogen bonding and pi-pi interactions are key to the compound's crystal architecture.
  • This structural insight can inform future research on related compounds and their potential applications.