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Updated: Jul 13, 2025

Protocol for the Synthesis of Ortho-trifluoromethoxylated Aniline Derivatives
Published on: January 19, 2016
2,6-Di-bromo-3,4,5-tri-meth-oxy-benzoic acid
Florian Meurer1, Tanya Dimova2, Michael Bodensteiner1
1Faculty of Chemistry and Pharmacy, University of Regensburg, Universitaetsstr. 31, 93053 Regensburg, Germany.
Researchers synthesized 2,6-dibromo-3,4,5-trimethoxybenzoic acid (DBrTMBA) and found its crystal structure forms stable chains via carboxylic acid interactions. This catameric arrangement is further stabilized by potential lone pair-π-hole interactions.
Area of Science:
- Organic Chemistry
- Crystallography
- Supramolecular Chemistry
Background:
- Understanding the self-assembly of organic molecules is crucial for designing new materials.
- Halogenated aromatic compounds exhibit unique intermolecular interactions influencing crystal packing.
- Previous studies reported the structure of 2,6-diiodo-3,4,5-trimethoxybenzoic acid (DITMBA).
Purpose of the Study:
- To synthesize and characterize 2,6-dibromo-3,4,5-trimethoxybenzoic acid (DBrTMBA).
- To investigate the crystal structure and intermolecular interactions of DBrTMBA.
- To compare the structural features of DBrTMBA with DITMBA.
Main Methods:
- Synthesis of DBrTMBA via bromination and transhalogenation of 2-iodo-3,4,5-trimethoxybenzoic acid.
- X-ray crystallography to determine the molecular and crystal structure of DBrTMBA.
- Analysis of intermolecular interactions, including hydrogen bonding and potential lone pair-π-hole interactions.
Main Results:
- DBrTMBA was successfully synthesized and characterized.
- The crystal structure reveals a catameric arrangement of DBrTMBA molecules.
- Carboxylic acid groups form an endless chain of hydrogen bonds (carbonyl-H interactions).
- A short carbonyl-phenyl contact suggests a stabilizing lone pair(O)-π-hole interaction.
Conclusions:
- DBrTMBA forms a stable chain-like supramolecular structure in the solid state.
- The observed catameric arrangement is driven by carboxylic acid hydrogen bonding.
- Lone pair-π-hole interactions may play a significant role in stabilizing the structure.
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