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Titration in Nonaqueous Solvents01:16

Titration in Nonaqueous Solvents

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Most acid-base titrations are performed in an aqueous medium. In aqueous titrations, water competes with weaker acids or bases for proton donation or acceptance, leading to ambiguous endpoints in the titration curve. Water also affects the partial ionization of weak acids or bases. For example, water accepts a proton from acetic acid to form hydronium and acetate ions. The hydronium ion formed is a stronger acid than acetic acid, and the acetate ion is a stronger base than water. As a result,...
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As depicted in the figure below, the unsymmetrical ketones can form two possible enolates: less substituted or more substituted enolates. Usually, the thermodynamic enolates are formed from the more substituted α-carbon atom, while the kinetic enolates are formed faster by deprotonation from the less substituted position. The thermodynamic enolates have lower energy, so they are more stable. But the energy required to form kinetic enolates is less.
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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
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Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...
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The keto and enol forms are known as tautomers and they constantly interconvert (or tautomerize) between the two forms under acid or base catalyzed conditions. Both the reactions involve the same steps—protonation and deprotonation— although in the reverse order.
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This lesson defines the leveling effect in acidic and basic solutions and its role in aqueous and non-aqueous solutions. It is essential to understand the competing nature of various species in a chemical system.
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Functionalized oxatriquinanes and their structural equilibrium in protic solvent.

Hideyuki Suzuki1, Hideaki Muratake

  • 1Research Foundation Itsuu Laboratory.

Chemical & Pharmaceutical Bulletin
|July 11, 2014
PubMed
Summary
This summary is machine-generated.

New organic oxonium cations, oxatriquinanes with specific functional groups, were synthesized. These compounds exist as stable solids but exhibit solvent-dependent stability, equilibrating to ring-opened forms in protic solvents.

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Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Heterocyclic Chemistry

Background:

  • Oxatriquinanes are a class of organic compounds with potential applications in various chemical fields.
  • Understanding the stability and reactivity of these compounds is crucial for their practical use.
  • Previous studies have explored the synthesis and properties of related structures.

Purpose of the Study:

  • To synthesize novel oxatriquinane hexafluorophosphate derivatives.
  • To investigate the structural stability and solvent-dependent behavior of these new compounds.
  • To explore the influence of different functional groups on oxatriquinane properties.

Main Methods:

  • Synthesis of oxatriquinane hexafluorophosphate bearing ethoxycarbonylmethyl and 2-oxopropyl groups.
  • Characterization of synthesized compounds using Nuclear Magnetic Resonance (NMR) spectroscopy, specifically (1)H-NMR.
  • Analysis of compound behavior in both aprotic (CD₃CN) and protic (CD₃OD) solvents.

Main Results:

  • Successful synthesis of stable solid oxatriquinane hexafluorophosphate compounds 7 and 11.
  • Observation of oxatriquinane 7 existing as an oxonium cation in CD₃CN but equilibrating to a ring-opened bicyclic compound 8 in CD₃OD.
  • Similar solvent-dependent equilibrium behavior was noted for oxatriquinane 11 and phenyl-substituted derivatives 12 and 14.

Conclusions:

  • Oxatriquinane hexafluorophosphate derivatives exhibit distinct stability profiles based on solvent polarity.
  • The presence of protic solvents induces ring-opening in these organic oxonium cations.
  • The synthesized compounds serve as valuable models for studying dynamic equilibria in heterocyclic systems.