Give any example of preparation of bis-arene by Fischer aluminium reduction method?
Answer (1)
The Fischer aluminum reduction method is a technique used in the preparation of bis-arene compounds, where an example involves the reduction of a metal salt to form a sandwich compound. Here's a step-by-step explanation of how this process typically works:
Preparation of the Metal Salt : A common starting material for the Fischer aluminum reduction is a metal salt, such as chromium chloride (CrCl 3 ).
Formation of a Complex : This metal salt is first dissolved in a suitable solvent, often in the presence of an arene compound like benzene. The arene acts as a ligand that will form part of the final sandwich compound structure.
Reduction : Aluminum powder, sometimes activated with iodine, is added to the solution. Aluminum acts as a reducing agent, donating electrons to reduce the metal salt (e.g., CrCl 3 ) to a lower oxidation state.
Complexation : During the reduction process, the metal center forms a complex with the arene ligands, resulting in the bis-arene product. For example, in the case of chromium and benzene, the product could be a bis-benzene chromium complex (C 6 H 6 ) 2 Cr.
Product Isolation : The bis-arene complex is then isolated from the reaction mixture, often through filtration or another separation method, and can be purified as needed.
Characterization : The final product is usually characterized by spectroscopic methods like NMR and mass spectrometry to confirm its structure.
The Fischer aluminum reduction method is particularly useful for creating stable and interesting organometallic structures that have applications in catalysis and materials science.
