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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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Crystalline Diboryldiazomethane: Synthesis and Reactivities.

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Researchers developed a stable method to synthesize diboryldiazomethanes, a new class of diazo compounds. These compounds show unique reactivity with Lewis acids and methoxide, opening new avenues in main-group chemistry.

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Area of Science:

  • Organometallic Chemistry
  • Main-Group Chemistry
  • Synthetic Organic Chemistry

Background:

  • Diboryldiazomethanes are highly desirable but synthetically challenging diazo compounds.
  • Dual boryl substitution offers potential for stabilizing and diversifying the diazo carbon center.
  • Previous methods have limited access to this important class of compounds.

Purpose of the Study:

  • To establish a stable synthetic route to diboryldiazomethanes.
  • To investigate the reactivity of diboryldiazomethanes with electrophiles and nucleophiles.
  • To explore the potential of diboryldiazomethanes in main-group controlled chemistry.

Main Methods:

  • Synthesis of diboryldiazomethanes via N2O-mediated diazo transfer from a preorganized B2N2C scaffold.
  • Reactivity studies using Lewis acids to probe binding sites.
  • Reactions with methoxide to investigate nucleophilic addition.
  • Characterization using multinuclear NMR spectroscopy and single-crystal X-ray diffraction (SC-XRD).

Main Results:

  • Successful synthesis of a stable diboryldiazomethane precursor.
  • Demonstrated selective binding of Lewis acids to either the terminal nitrogen or carbon center of the diazo unit.
  • Observed methoxide-induced B-C bond addition and ring-opening to yield a monoboryl diazo derivative.
  • Full characterization of all synthesized species confirmed their structures.

Conclusions:

  • This study provides a robust entry point into diboryldiazo chemistry.
  • The reactivity of diboryldiazomethanes can be tuned by the nature of the attacking reagent.
  • These findings establish a versatile platform for main-group-controlled diazo chemistry.