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Gas-Phase Anionic σ-Adduct (Trans)formations in Heteroaromatic Systems.

Magdalena Zimnicka1, Witold Danikiewicz

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Summary

This study explores gas-phase reactions between heteroaromatic anions and C-H acids. Reaction outcomes depend on proton affinity differences, leading to proton transfer, adduct formation, or no ionic products.

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Area of Science:

  • Organic Chemistry
  • Physical Chemistry
  • Reaction Mechanisms

Background:

  • Heteroaromatic compounds like thiophene and furan are crucial in organic synthesis.
  • Understanding gas-phase reactions of their anions provides fundamental insights into chemical reactivity.

Purpose of the Study:

  • To investigate the gas-phase reactions of nitrothiophene and nitrofuran anions with C-H acids.
  • To elucidate the influence of proton affinity differences on reaction pathways and product formation.

Main Methods:

  • Gas-phase ion-molecule reactions were studied.
  • Analysis of ionic products to determine reaction mechanisms.
  • Theoretical calculations to propose reaction pathways and intermediates.

Main Results:

  • Reactions are classified into three groups based on proton affinity difference (ΔPA).
  • Proton transfer dominates when ΔPA < 0 kcal mol⁻¹.
  • Formation of σ-adducts and substitution products (VNS, SNAr, cine, tele) observed for moderate ΔPA.
  • No ionic products formed when ΔPA > 16 kcal mol⁻¹.

Conclusions:

  • Proton affinity difference is a key determinant in the reactivity of heteroaromatic anions with C-H acids.
  • Multiple reaction mechanisms, including addition-elimination and substitution, are operative.
  • The study provides a framework for predicting reaction outcomes based on thermodynamic parameters.