Structural Formula Vector Image
Title: Allopregnane-3a,20b-diol
CAS Registry Number: 566-57-4
CAS Name: (3a,5a,20R)-Pregnane-3,20-diol
Additional Names: 3a,20b-dihydroxy-5a-pregnane
Molecular Formula: C21H36O2
Molecular Weight: 320.51
Percent Composition: C 78.69%, H 11.32%, O 9.98%
Literature References: Progesterone metabolite. Prepn by hydrogenation of progesterone: Marker, Lawson, J. Am. Chem. Soc. 61, 588 (1939); by catalytic hydrogenation of epiallopregnane-3-ol-20-one: Marker, US 2231019 (1941 to Parke, Davis); by reduction of 5a-pregn-1-ene-3,20-dione with lithium aluminum hydride: Schütt, Tamm, Helv. Chim. Acta 41, 1751 (1958).
Properties: Needles from acetone, mp 207-209°. [a]D26 +12° (c = 1.132 in chloroform).
Melting point: mp 207-209°
Optical Rotation: [a]D26 +12° (c = 1.132 in chloroform)

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