Title: Vitamin D1
CAS Registry Number: 520-91-2
Molecular Formula: C56H88O2
Molecular Weight: 793.30
Percent Composition: C 84.78%, H 11.18%, O 4.03%
Line Formula: C28H44O.C28H44O
Literature References: A 1:1 molecular compd of lumisterol and vitamin D2. Prepn: Windaus et al., Ann. 489, 252 (1931); 493, 259 (1932).
Properties: Crystals from acetone, mp 124-125°. Sublimes in high vacuum at 135°. Dec 180°. Soly at 16° (g/ml): 0.037 of acetone; 0.024 of petr ether (bp 35-40°); 0.020 of methanol. uv max (0.02% sol in petr ether): 265 nm (e 1.56). [a]D20 +140.5° (8.9 mg in 2 ml acetone), +140.5° (ethanol), +127° (chloroform).
Melting point: mp 124-125°
Boiling point: bp 35-40°
Optical Rotation: [a]D20 +140.5° (8.9 mg in 2 ml acetone), +140.5° (ethanol), +127° (chloroform)
Absorption maximum: uv max (0.02% sol in petr ether): 265 nm (e 1.56) |