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Published on: October 10, 2016
Synthesis and structural characterisation of lithium and sodium 2,6-dibenzylphenolate complexes
Marcus L Cole1, Peter C Junk, Kathryn M Proctor
1School of Chemistry, Monash University, Victoria, 3800, Australia.
Dalton Transactions (Cambridge, England : 2003)
|July 6, 2006
Summary
This study synthesizes novel dimeric alkali metal phenolates from 2,6-dibenzylphenol and its dimethoxy derivative. Unexpectedly, direct sodiation of 2,6-dibenzylphenol resulted in benzyl C-C bond cleavage.
Area of Science:
- Organometallic Chemistry
- Coordination Chemistry
- Synthetic Chemistry
Background:
- Alkali metal phenolates are versatile building blocks in inorganic and organometallic synthesis.
- Understanding the coordination behavior of substituted phenolates with alkali metals is crucial for designing new materials and catalysts.
- Previous studies have explored various alkali metal complexes, but the specific behavior of dibenzylphenolates remains less characterized.
Purpose of the Study:
- To synthesize and characterize novel dimeric alkali metal phenolates of 2,6-dibenzylphenol (HOdbp) and 2,2"-dimethoxy-2,6-dibenzylphenol (HOdbpOMe).
- To investigate the structural features, including coordination modes and intermolecular interactions, of these newly synthesized complexes.
- To explore the reactivity of HOdbp towards direct sodiation, particularly concerning potential C-C bond cleavage.
Main Methods:
- Stoichiometric treatment of substituted phenols (HOdbp, HODbpOMe) with strong bases (n-butyllithium, sodium bis(trimethylsilyl)amide).
- Reactions conducted in ethereal solvents (Et2O, DME, THF) to afford alkali metal phenolates.
- Characterization of the resulting dimeric complexes, including structural elucidation of coordination and bonding.
Main Results:
- Successful synthesis of dimeric alkali metal phenolates [{M(Odbp)(L)}2] and [{M(OdbpOMe)(L)}2] (M = Li, Na; L = solvent).
- Complexes 3 and 7 showed methoxy coordination, while sodium complexes (5-8) exhibited pi-aryl contacts.
- Attempted direct sodiation of HOdbp unexpectedly yielded a 2-benzylphenolate complex (9) via benzyl C-C bond scission.
Conclusions:
- The study successfully synthesized and characterized a series of dimeric alkali metal phenolates with unique structural motifs.
- The coordination behavior varies with the alkali metal, solvent, and phenol substituents, showcasing interesting intermolecular interactions.
- The unexpected C-C bond cleavage during direct sodiation highlights a novel reactivity pathway for benzylphenolates.
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