1,2-プロパンジエン-1,3-ジオン

1,2-プロパンジエン-1,3-ジオン 化学特性,用途語,生産方法

• 化学的特性

  colorless, highly refractive liquid or colorless gas, which burns with a blue sooty flame; odor like acrolein or mustard oil; structure: O=C=C=C=O [MER06]

• 物理的性質

  Colorless gas; strong, pungent odor; gas density 2.985 g/L; liquid density 1.114 g/mL at 0°C; refractive index 1.4538 (at 0°C); vapor pressure 588 torr at 0°C; liquefies at 6.8°C; freezes at -111.3°C; burns with a blue sooty flame; reacts with water. The compound is unstable, polymerizing on storage.

• 使用

  preparation of malonates; improving dye affinity of fibers.

• 製造方法

  Carbon suboxide is prepared by dehydration of malonic acid with phosphorus pentoxide in vacuum at 140 to 150°C:
  CH₂(COOH)₂→ C₃O₂ + 2H₂O
  Alternatively, the compound may be prepared by thermal dissociation of diacetyltartaric anhydride.

• 危険性

  Carbon suboxide forms explosive mixtures in air. The lower and upper explosive limits are 6 to 30% by volume in air, respectively. The gas is a strong lacrimator and an irritant to eyes, nose and respiratory tract. Exposure to high concentations is dangerous. .

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