Vitamin D4
Title: Vitamin D4
CAS Registry Number: 511-28-4
CAS Name: (3b,5Z,7E)-9,10-Secoergosta-5,7,10(19)-trien-3-ol
Additional Names: 22:23-dihydrovitamin D2; 22,23-dihydroergocalciferol
Molecular Formula: C28H46O
Molecular Weight: 398.66
Percent Composition: C 84.36%, H 11.63%, O 4.01%
Literature References: Prepd from 22:23-dihydroergosterol by irradiation with light of the magnesium arc: Windaus, Trautmann, Z. Physiol. Chem. 247, 185 (1937). Synthesis: P. J. Kocienski et al., J. Chem. Soc. Perkin Trans. 1 1979, 1290.
Properties: Platelets from dil acetone, mp 96-98°. Originally given as mp 107-108°, see Windaus, Guntzel, Ann. 538, 122 (1939). [a]D18 +89.3° (c = 0.47 in acetone). uv max: 265 nm. Not precipitated by digitonin. Practically insol in water. Sol in the usual organic solvents except petr ether; slightly sol in vegetable oils.
Melting point: mp 96-98°; mp 107-108°
Optical Rotation: [a]D18 +89.3° (c = 0.47 in acetone)
Absorption maximum: uv max: 265 nm

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