Dehydroergosterol

Title: Dehydroergosterol
CAS Registry Number: 516-85-8
CAS Name: (3b,22E)-Ergosta-5,7,9(11),22-tetraen-3-ol
Molecular Formula: C28H42O
Molecular Weight: 394.63
Percent Composition: C 85.22%, H 10.73%, O 4.05%
Literature References: Prepd from ergosterol: Windhaus, Linsert, Ann. 465, 148 (1928); Callow, Rosenheim, J. Chem. Soc. 1933, 387. From isopyrocalciferol: Windhaus, Dimroth, Ber. 70, 376 (1937).
Properties: Solvated plates from alcohol, needles from ether. When dry, mp 146°. bp0.5 230°. [a]D15 +149.2° (c = 1.9 in chloroform). Absorption spectrum: Morton, de Gouveia, J. Chem. Soc. 1934, 916. One gram dissolves in 800 ml methanol. Freely sol in ether, chloroform, benzene.
Melting point: mp 146°
Boiling point: bp0.5 230°
Optical Rotation: [a]D15 +149.2° (c = 1.9 in chloroform)
Derivative Type: Acetate
Molecular Formula: C30H44O2
Molecular Weight: 436.67
Percent Composition: C 82.52%, H 10.16%, O 7.33%
Properties: mp 146°. [a]D16 +204° (c = 1.1 in chloroform).
Melting point: mp 146°
Optical Rotation: [a]D16 +204° (c = 1.1 in chloroform)
Derivative Type: Methyl ether
Molecular Formula: C29H44O
Molecular Weight: 408.66
Percent Composition: C 85.23%, H 10.85%, O 3.92%
Properties: mp 106°. [a]D20 +166° (c = 2 in chloroform).
Melting point: mp 106°
Optical Rotation: [a]D20 +166° (c = 2 in chloroform)
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