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Pseudoacids. II. 2-Acylbenzoic acid derivatives

E J Valente1, S B Martin, L D Sullivan

  • 1Department of Chemistry, Mississippi College, Clinton, MS 39058, USA. valente@mc.edu

Acta Crystallographica. Section B, Structural Science
|July 11, 1998
PubMed
Summary

This study details the crystal structures of cyclic o-acylbenzoic acid derivatives, revealing how bond lengths in isobenzofuran and isoindole rings vary with attached group basicity. These findings offer insights into the chemical properties of these pseudoacid compounds.

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Area of Science:

  • Organic Chemistry
  • Crystallography
  • Structural Analysis

Background:

  • Cyclic o-acylbenzoic acids and their derivatives are important chemical entities with diverse applications.
  • Understanding the structural nuances of these compounds is crucial for predicting their reactivity and properties.
  • Previous studies have explored various derivatives, but a comprehensive structural analysis of pseudoacid derivatives was lacking.

Purpose of the Study:

  • To elucidate the crystal structures of a range of cyclic o-acylbenzoic acid derivatives, including chlorides, amides, esters, and anhydrides.
  • To investigate the relationship between the basicity of attached groups and the observed bond length variations in the isobenzofuran and isoindole ring systems.
  • To characterize both endocyclic and exocyclic nitrogen pseudoamides, as well as pseudoanhydride structures.

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Main Methods:

  • Single-crystal X-ray diffraction was employed to determine the three-dimensional structures of the synthesized compounds.
  • Detailed crystallographic data, including space group and lattice parameters, were collected and refined for each derivative.
  • Analysis of bond distances and angles within the isobenzofuran and isoindole cores was performed.

Main Results:

  • The crystal structures of seven derivatives of cyclic o-acylbenzoic acids were determined, including chlorides, amides, esters, and anhydrides.
  • Planar isobenzofuran and isoindole ring systems were observed in the pseudoacid derivatives.
  • Significant variations in carbon-heteroatom bond distances were found to correlate with the relative basicities of the attached functional groups.

Conclusions:

  • The study provides detailed structural insights into cyclic o-acylbenzoic acid derivatives and their pseudoacid forms.
  • The observed bond length variations offer a quantitative understanding of electronic effects within these heterocyclic systems.
  • The findings contribute to the broader knowledge of organic structural chemistry and the design of novel functional molecules.