beta-Tocopherol
Title: b-Tocopherol
CAS Registry Number: 16698-35-4; 148-03-8 (dl-form)
CAS Name: (2R)-3,4-Dihydro-2,5,8-trimethyl-2-[(4R,8R)-4,8,12-trimethyltridecyl]-2H-1-benzopyran-6-ol
Additional Names: (+)-2,5,8-trimethyl-2-(4,8,12-trimethyltridecyl)-6-chromanol; 5,8-dimethyltocol; cumotocopherol; neotocopherol; p-xylotocopherol
Molecular Formula: C28H48O2
Molecular Weight: 416.68
Percent Composition: C 80.71%, H 11.61%, O 7.68%
Literature References: One of the naturally occurring forms of vitamin E, q.v. Is biologically less active than a-tocopherol. May be separated by fractional crystn: Emerson et al., Science 83, 421 (1936); J. Biol. Chem. 113, 319 (1936); Baxter et al., J. Am. Chem. Soc. 65, 918 (1943).
Properties: Pale yellow, viscous oil. bp0.1 200-210°. [a]546.125 +2.9° (c = 7.15 in ethanol). uv max: 297 nm (E1cm1% 87.6). Insol in water. Freely sol in oils, fats, acetone, alcohol, chloroform, ether, other fat solvents. Very stable to heat and alkalies. Slowly oxidized by atmospheric oxygen, rapidly by ferric and silver salts. Gradually darkens on exposure to light.
Boiling point: bp0.1 200-210°
Optical Rotation: [a]546.125 +2.9°
Absorption maximum: uv max: 297 nm (E1cm1% 87.6)

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