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An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...
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The acidic strength of hydrocarbons follows the order: Alkynes > Alkenes > Alkanes. The strength of an acid is commonly expressed in units of pKa — the lower the pKa, the stronger the acid. Among the hydrocarbons, terminal alkynes have lower pKa values and are, therefore, more acidic. For example, the pKa values for ethane, ethene, and acetylene are 51, 44, and 25, respectively, as shown here.
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Aggregation and Solvation of n-Butyllithium.

Onkei Tai1, Russell Hopson1, Paul G Williard1

  • 1Department of Chemistry, Brown University , Providence, Rhode Island 02912, United States.

Organic Letters
|July 28, 2017
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n-butyllithium aggregation state varies with solvent and temperature. In hydrocarbons, it forms octamers and hexamers, while ethereal solvents lead to tetra-solvated tetramers and dimers, with binding constants measured.

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Area of Science:

  • Organometallic Chemistry
  • Solution-State NMR Spectroscopy
  • Supramolecular Chemistry

Background:

  • n-Butyllithium is a key organometallic reagent in organic synthesis.
  • Its aggregation state significantly influences reactivity and solubility.
  • Understanding aggregation in different solvents is crucial for reaction control.

Purpose of the Study:

  • To characterize the solution-state aggregation of n-butyllithium.
  • To determine the influence of hydrocarbon and ethereal solvents on aggregation.
  • To quantify ligand binding constants for solvated n-butyllithium species.

Main Methods:

  • Diffusion-Ordered Nuclear Magnetic Resonance (DOSY) spectroscopy was employed for solution characterization.
  • Variable temperature studies were conducted in hydrocarbon solvents.
  • Titration experiments using 1H NMR/DOSY were performed in ethereal solvents (THF, diethyl ether).

Main Results:

  • In hydrocarbon solvents, n-butyllithium aggregated as octamers at -40 °C, deaggregating to hexamers upon warming.
  • In ethereal solvents, n-butyllithium formed tetra-solvated tetramers.
  • Excess ethereal solvent led to deaggregation to tetra-solvated dimers.

Conclusions:

  • Solvent polarity and temperature profoundly affect n-butyllithium aggregation state.
  • DOSY NMR is effective for elucidating aggregation behavior and solvation.
  • Ligand binding constants provide insights into the stability of solvated species.