| 英文名 | Acetylacetone |
|---|---|
| 英文别名 | 2,4-pentanedione |
| 中文名 | 乙酰丙酮 |
| 类型 | 脂肪族化合物 |
| CAS号 | 123-54-6 |
| 物理性质 | M 100.1, m -23℃, 45℃/30mm, b 140.4℃/atm, d30.2 0.9630, n18.5 1.45178, pK125 -5.0 (enol), -6.6 (keto), pK225 8.95. |
| 提纯方法 | Small amounts of acetic acidare removed by shaking with small portions of 2M NaOH until the aqueous phase remains faintly alkaline. The sample, after washing with water, is dried with anhydrous Na2SO4, and distilled through a modified Vigreux column (p 11) Cartledge J Am Chem Soc 73 4416 1951]. An additional purification step is fractional crystallisation from the liquid. Alternatively, there is less loss of acetylacetone if it is dissolved in four volumes of *benzene and the solution is shaken three times with an equal volume of distilled water (to extract acetic acid): the *benzene is then removed by distillation at 43-53℃ and 20-30 mm through a helices-packed column. It is then refluxed over P2O5 (10g/L) and fractionally distilled under reduced pressure. The distillate (sp conductivity 4 x 10-8 ohm-1cm-1 ) is suitable for polarography [Fujinaga & Lee Talanta 24 395 1977]. |
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Acetylacetone提纯方法
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