|Preferred IUPAC name
|Systematic IUPAC name
3D model (JSmol)
|Molar mass||151.164 g·mol−1|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Sodium naphthalenide, also known as sodium naphthalide, is an organic salt with the chemical formula Na+C10H8−. In the research laboratory, it is used as a reductant in the synthesis of organic, organometallic, and inorganic chemistry. It has not been isolated as a solid, but it is usually prepared fresh before use.
Preparation and properties
The alkali metal naphthalenides are prepared by stirring the metal with naphthalene in an ethereal solvent, usually as tetrahydrofuran or dimethoxyethane. The resulting salt is dark green. The anion is a radical, giving a strong EPR signal near g = 2.0, with a reduction potential near -2.5 V vs NHE. Its deep green color arises from absorptions centered at 463, 735 nm.
The anion is strongly basic, and a typical degradation pathway involves reaction with water and related protic sources. These reactions afford dihydronaphthalene:
- 2 NaC10H8 + 2 H2O → C10H10 + C10H8 + 2 NaOH
For some synthetic operations, sodium naphthalenide is excessively reducing (too negative) or too insoluble. In such cases, alternative reductants are selected.
- Sodium acenaphthalenide is milder by about 0.75 V, reflecting the milder reduction potential of polycyclic aromatic compounds.
- Lithium biphenyl is a THF-soluble species related to lithium naphthalenide except that it is a poorer ligand.
- Sodium 1-methylnaphthalenide is more soluble than sodium naphthalenide, which is useful for low-temperature reductions.
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