Structural Formula Vector Image
Title: Allopregnane-3b,17a,20a-triol
CAS Registry Number: 570-50-3
CAS Name: 5a-Pregnane-3b,17,20a-triol
Additional Names: 3b,17,20a-trihydroxy-5a-pregnane; Reichstein's substance O
Molecular Formula: C21H36O3
Molecular Weight: 336.51
Percent Composition: C 74.95%, H 10.78%, O 14.26%
Literature References: Isoln from adrenal glands: Steiger, Reichstein, Helv. Chim. Acta 21, 546 (1938). Prepn from allopregn-16-en-3b-ol-20-one: Plattner et al., ibid. 31, 2210 (1948); Julian et al., US 2662904 (1953 to Glidden).
Properties: Leaflets from dil methanol, mp 222-223°. [a]D20 -12.55° (c = 1.195 in methanol).
Melting point: mp 222-223°
Optical Rotation: [a]D20 -12.55° (c = 1.195 in methanol)
Derivative Type: 3,20-Diacetate
Molecular Formula: C25H40O5
Molecular Weight: 420.58
Percent Composition: C 71.39%, H 9.59%, O 19.02%
Properties: Crystals by sublimation, mp 252°. [a]D21 -30.1° (c = 1.097 in acetone).
Melting point: mp 252°
Optical Rotation: [a]D21 -30.1° (c = 1.097 in acetone)
Status: This monograph has been retired and is no longer subject to revision or update.

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