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Gold catalysis: on the phenol synthesis
A S Hashmi1, T M Frost, J W Bats
1Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany. hashmi@hashmi.de
Organic Letters
|November 9, 2001
Summary
Gold catalysts facilitate phenol synthesis via oxygen atom migration. While other metals show activity, gold remains the most effective, enabling complex doubly annellated arene formation.
Area of Science:
- Organic Chemistry
- Catalysis
Background:
- Gold catalysis is increasingly recognized for its utility in organic synthesis.
- Understanding the mechanism of gold-catalyzed reactions is crucial for developing new synthetic methodologies.
Purpose of the Study:
- To investigate the mechanism of gold-catalyzed phenol synthesis.
- To explore the catalytic activity of other late transition metals in this transformation.
- To demonstrate the synthesis of doubly annellated arenes using gold catalysts.
Main Methods:
- Gold-catalyzed intramolecular oxygen atom migration.
- Comparative studies with other late transition metals (d(8) configuration).
- Synthesis of arenes with additional alkynyl substituents.
Main Results:
- An intramolecular migration of the oxygen atom was confirmed in gold-catalyzed phenol synthesis.
- Gold(III) was identified as a catalytically active species.
- Gold exhibited superior catalytic activity and selectivity compared to other tested metals.
- Doubly annellated arenes were synthesized through subsequent ring-closing reactions.
Conclusions:
- The mechanism of gold-catalyzed phenol synthesis involves intramolecular oxygen migration.
- Gold is a highly effective catalyst for phenol synthesis and the construction of complex polycyclic aromatic compounds.