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Mixed Aggregates of 1-Methoxyallenyllithium with Lithium Chloride

Journal Article · · ChemistryOpen
 [1];  [2];  [2]
  1. City Univ. of New York (CUNY), NY (United States); DOE/OSTI
  2. Univ. of Hawaii at Manoa, Honolulu, HI (United States); Univ. of Hawaii Cancer Center, Honolulu, HI (United States)

A combined computational and 13C NMR study was used to investigate the formation of mixed aggregates of 1-methoxyallenyllithium and lithium chloride in tetrahydrofuran (THF) solution. The observed and calculated chemical shifts, as well as the calculated free energies of mixed aggregate formation (MP2/6-31+G(d)), are consistent with the formation of a mixed dimer as the major species in solution. Free energies of mixed dimer, trimer, and tetramer formation were calculated by using the B3LYP and MP2 methods and the 6-31+G(d) basis set. The two methods generated different predictions of which mixed aggregates will be formed, with B3LYP/6-31+ G(d) favoring mixed trimers and tetramers in THF solution, and MP2/6-31+G(d) favoring mixed dimers. Formation of the sterically unhindered mixed dimers is also consistent with the enhanced reactivity of these compounds in the presence of lithium chloride. The spectra are also consistent with some residual 1-methoxyallenyllithium tetramer, as well as small amounts of higher mixed aggregates. Although neither computational method is perfect, for this particular system, the calculated free energies derived using the MP2 method are in better agreement with experimental data than those derived using the B3LYP method.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE; National Science Foundation (NSF); National Institutes of Health (NIH)
Grant/Contract Number:
AC03-76SF00098
OSTI ID:
1623577
Journal Information:
ChemistryOpen, Journal Name: ChemistryOpen Journal Issue: 6 Vol. 3; ISSN 2191-1363
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (11)