Acetal
Title: Acetal
CAS Registry Number: 105-57-7
CAS Name: 1,1-Diethoxyethane
Additional Names: diethylacetal; acetaldehyde diethyl acetal; ethylidene diethyl ether
Molecular Formula: C6H14O2
Molecular Weight: 118.17
Percent Composition: C 60.98%, H 11.94%, O 27.08%
Line Formula: CH3CH(OC2H5)2
Literature References: Made from acetaldehyde and alcohol in the presence of anhydrous calcium chloride or of small quantities of mineral acid: H. Adkins, B. H. Nissen, J. Am. Chem. Soc. 44, 2750 (1922); eidem, Org. Synth. coll. vol. I, 1 (2nd ed., 1941). Toxicity study: H. F. Smyth et al., J. Ind. Hyg. Toxicol. 31, 60 (1949).
Properties: Volatile liquid. d420 0.8254. bp760 102.7°; bp200 66.3°; bp60 39.8°; bp40 31.9°; bp20 19.6°; bp10 8.0°; bp5 -2.3°; bp1.0 -23°. nD20 1.38193. Flash pt, closed cup: 97°F (36°C). uv spectrum: Purvis, J. Chem. Soc. 127, 9 (1925). 100 g water dissolve 5 g acetal. Misc with alcohol, 60% alcohol, ether. Sol in heptane, methylcyclohexane, propyl-, isopropyl-, butyl-, isobutyl alcohol, and ethyl acetate. Tends to polymerize on standing. Stable to alkalies. LD50 orally in rats: 4.57 g/kg (Smyth).
Boiling point: bp760 102.7°; bp200 66.3°; bp60 39.8°; bp40 31.9°; bp20 19.6°; bp10 8.0°; bp5 -2.3°; bp1.0 -23°
Flash point: Flash pt, closed cup: 97°F (36°C)
Index of refraction: nD20 1.38193
Density: d420 0.8254
Toxicity data: LD50 orally in rats: 4.57 g/kg (Smyth)
Use: Solvent; in synthetic perfumes such as jasmine; in organic syntheses.

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