Senecialdehyde
Title: Senecialdehyde
CAS Registry Number: 107-86-8
CAS Name: 3-Methyl-2-butenal
Additional Names: 3,3-dimethylacrolein; 3-methylcrotonaldehyde; senecioaldehyde; b,b-dimethylacrolein
Molecular Formula: C5H8O
Molecular Weight: 84.12
Percent Composition: C 71.39%, H 9.59%, O 19.02%
Line Formula: (CH3)2C=CHCHO
Literature References: Prepn from isoamyl alcohol: Fischer et al., Ber. 64, 30 (1931); Fischer, Löwenberg, Ann. 494, 272 (1932); cf. Burkhardt et al., GB 512465 (1939); Montavon, Saucy, US 2902515 (1959 to Hoffmann-La Roche).
Properties: Liquid. Odor more pungent than that of isovaleraldehyde. Autooxidizes easily, but the pure substance can be stored under vacuum. d420 0.8722; bp730 133°; nD20 1.4526. Absorption spectrum: Forbes, Skilton, J. Org. Chem. 24, 436 (1959).
Boiling point: bp730 133°
Index of refraction: nD20 1.4526
Density: d420 0.8722
CAUTION: Irritant to mucous membranes. Narcotic in high concentrations.

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