Structural Formula Vector Image
Title: Allopregnane-3b,21-diol-11,20-dione
CAS Registry Number: 566-02-9
CAS Name: 3b,21-Dihydroxy-5a-pregnane-11,20-dione
Additional Names: 3b,21-dihydroxy-11,20-dioxo-5a-pregnane; Kendall's compound H; Reichstein's substance N
Molecular Formula: C21H32O4
Molecular Weight: 348.48
Percent Composition: C 72.38%, H 9.26%, O 18.36%
Literature References: Isoln from adrenal glands: Steiger, Reichstein, Helv. Chim. Acta 21, 546 (1938). Prepn by reduction of allopregnan-21-ol-3,11,20-trione acetate: Mancera et al., J. Am. Chem. Soc. 77, 5669 (1955).
Properties: Hydrated crystals from dil acetone; anhydr shiny spears from benzene or acetone, mp 189-191°. [a]D19 +93.8° (c = 1.4 in abs ethanol).
Melting point: mp 189-191°
Optical Rotation: [a]D19 +93.8° (c = 1.4 in abs ethanol)
Derivative Type: 3,21-Diacetate
Molecular Formula: C25H36O6
Molecular Weight: 432.55
Percent Composition: C 69.42%, H 8.39%, O 22.19%
Properties: Clusters of needles from ether-pentane, mp 148-149.5°. [a]D18 +77.5 ± 2.5° (acetone); [a]D19 +85.6 ± 2° (dioxane).
Melting point: mp 148-149.5°
Optical Rotation: [a]D18 +77.5 ± 2.5° (acetone); [a]D19 +85.6 ± 2° (dioxane)
Status: This monograph has been retired and is no longer subject to revision or update.

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