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This lesson explains the definition, classification, and characteristic features of an electrophile that are key features of nucleophilic substitution reactions. An analysis of their charge and orbital picture helps understand their reactivity for seeking electrons. Electrophiles can be classified into positive and neutral species. Other classes include free radicals and polar functional groups.
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Radicals adjacent to electron‐withdrawing groups are called electrophilic radicals. These radicals readily react with nucleophilic alkenes. For example, the malonate radical, in which the radical center is flanked by two electron‐withdrawing groups, reacts readily with butyl vinyl ether, which consists of an electron‐donating oxygen substituent. The reaction between electrophilic malonate radical and nucleophilic vinyl ether is favored because the radical has a...
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Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores
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Electrophilic boron carboxylate and phosphinate complexes.

Diya Zhu1, James H W LaFortune1, Rebecca L Melen2

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Summary

New boron compounds derived from carboxylic acids yield aldehydes via concurrent reduction. These acyloxyborate derivatives were found inactive in direct amidation reactions.

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Area of Science:

  • Organoboron Chemistry
  • Synthetic Organic Chemistry
  • Catalysis

Background:

  • Carboxylic acids are versatile precursors in organic synthesis.
  • Boron compounds are increasingly explored for catalytic applications.
  • Understanding reaction mechanisms is crucial for developing new synthetic methodologies.

Purpose of the Study:

  • To investigate the reactions of carboxylic acids with H2B(C6F5)·SMe2.
  • To explore the synthesis of novel acyloxyborate derivatives.
  • To elucidate the mechanism of product formation and assess catalytic activity.

Main Methods:

  • Reaction of various carboxylic acids (Tol, Ph, C6F5, Me2BrC, Me) with H2B(C6F5)·SMe2.
  • Synthesis of analogous species using HB(C6F5)2 and H2B(C6F5)·SMe2 with carboxylic and phosphinic acids.
  • Characterization of the resulting acyloxyborate derivatives and assessment of their reactivity in amidation reactions.

Main Results:

  • Formation of [RC(O)OB(C6F5)]2O species in high yields (87-95%) with concurrent reduction of carboxylic acids to aldehydes.
  • Proposed mechanism involving a cyclic eight-membered ring intermediate.
  • Synthesis of novel acyloxyborate derivatives, including [TolC(O)OB(C6F5)2]2, [(C6F5)C(O)OB(C6F5)2]2, and [Ph2P(O)OBH(C6F5)]2.
  • Subsequent reactions of these products yielded TolC(O)OBH(C6F5)(NC5H4NMe2) and Ph2P(O)OBH(C6F5)(NC5H4NMe2).
  • Acyloxyborate derivatives 1-4 showed no activity in direct amidation of carboxylic acids.

Conclusions:

  • The reaction of carboxylic acids with H2B(C6F5)·SMe2 provides a route to aldehydes and novel acyloxyborate compounds.
  • The observed inactivity in amidation suggests a requirement for sterically accessible boron centers.
  • This study expands the scope of organoboron chemistry and offers insights into reaction pathways.