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Computational studies of lithium diisopropylamide deaggregation.
Alexander C Hoepker1, David B Collum
1Department of Chemistry and Chemical Biology Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, United States.
The Journal of Organic Chemistry
|September 6, 2011
Summary
Density functional theory computations reveal eight distinct structures for the deaggregation of lithium diisopropylamide (LDA) dimer. These findings suggest deaggregation rates may limit LDA reactivity in synthesis.
Area of Science:
- Computational Chemistry
- Organometallic Chemistry
- Reaction Mechanisms
Background:
- Lithium diisopropylamide (LDA) is a crucial strong, non-nucleophilic base in organic synthesis.
- The aggregation state of LDA significantly influences its reactivity and selectivity.
- Understanding LDA deaggregation is key to controlling its synthetic applications.
Purpose of the Study:
- To computationally investigate the deaggregation process of a lithium diisopropylamide (LDA) dimer.
- To elucidate the structural landscape and energy barriers involved in LDA deaggregation.
- To correlate deaggregation dynamics with LDA reactivity in synthetic contexts.
Main Methods:
- Density functional theory (DFT) calculations were employed using specific basis sets ([MP2/6-31G(d)//B3LYP/6-31G(d)]).
- The study focused on the deaggregation of an LDA dimer solvated by two tetrahydrofuran (THF) ligands.
- Analysis included identifying distinct structural minima and calculating energy barriers for exchange.
Main Results:
- Eight distinct structural minima were identified for the trisolvated LDA monomer formed from deaggregation.
- Calculated energy barriers for deaggregation were found to be comparable to experimentally observed values.
- The findings indicate that deaggregation processes can be rate-limiting under certain conditions.
Conclusions:
- The deaggregation of lithium diisopropylamide (LDA) dimer involves multiple distinct conformational isomers.
- Computed barriers suggest that deaggregation kinetics play a significant role in dictating LDA's reactivity.
- These insights are vital for optimizing synthetic strategies employing LDA.
