Etikkahappoanhydridi

Etikkahappoanhydridi
Tunnisteet
CAS-numero 108-24-7
PubChem CID 7918
Ominaisuudet
Molekyylikaava C4H6O3
Moolimassa 102,1 g/mol
Ulkomuoto neste (väritöntä, herkkäliikkeistä,
pistävänhajuista)
Sulamispiste –73 °C (200 K)
Kiehumispiste 139 °C (412 K)
Tiheys 1,08 g/cm3
Liukoisuus veteen reagoi veden kanssa

Etikkahappoanhydridi on orgaaninen yhdiste (etikkahapon anhydridi), joka on huoneenlämmössä (20 °C) olomuodoltaan väritöntä, herkkäliikkeistä ja pistävänhajuista nestettä. Sen kemiallinen kaava on C4H6O3 ja rakennekaava on (CH3CO)2O.[1] Etikkahappoanhydridistä käytetään myös nimityksiä asetanhydridi, etikka-anhydridi ja asetyylioksidi.

Etikkahappoanhydridin moolimassa on 102,09 g/mol,[1] sulamispiste –73 °C, kiehumispiste 139 °C, tiheys 1,08 g/cm3, hajukynnys 0,1–0,4 ppm (0,4–1,7 mg/m3, leimahduspiste 49 °C c.c., itsesyttymislämpötila 316 °C ja CAS-numero 108-24-7. Etikkahappoanhydridi voi palaa, mutta se ei syty helposti. Sen palamistuotteita ovat hiilidioksidi, hiilimonoksidi ja etikkahappo.

Etikkahappoanhydridi reagoi nopeasti kuuman veden kanssa, jolloin muodostuu etikkahappoa.

(CH3CO)2O + H2O → 2CH3COOH

Etikkahappoanhydridiä käytetään asetaattiestereiden kuten selluloosa-asetaatin valmistukseen ja lääkeraaka-aineiden kuten asetyylisalisyylihapon eli aspiriinin valmistuksessa sekä synteettisten kuitujen, muovien, räjähdysaineiden ja hajuvesien valmistukseen. Lisäksi etikkahappoanhydridiä käytetään tärkkelyksen modifiointiin ja laboratorioreagenssina.

Lähteet

  1. ↑ a b Acetic Anhydride PubChem. Viitattu 23.7.2024. (englanniksi)

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