Allopregnane
Title: Allopregnane
CAS Registry Number: 641-85-0
CAS Name: (5a)-Pregnane
Molecular Formula: C21H36
Molecular Weight: 288.51
Percent Composition: C 87.42%, H 12.58%
Literature References: Prepn from corticosterone: Steiger, Reichstein, Helv. Chim. Acta 21, 161 (1938); from allopregnan-3-one: Ruzicka et al., ibid. 22, 1294 (1939); from 21-hydroxyallopregnane: Plattner et al., ibid. 27, 1177 (1944); Casanova, Reichstein, ibid. 32, 647 (1949); by degradation of conessine: Haworth et al., J. Chem. Soc. 1949, 831; by Hofmann decomposition of 3b- and 3a-dimethylaminopregnanes: Haworth et al., ibid. 1953, 1110.
Properties: Crystals from acetone + methanol, mp 84-85°. [a]D19 +18.4° (c = 1.69 in chloroform).
Melting point: mp 84-85°
Optical Rotation: [a]D19 +18.4° (c = 1.69 in chloroform)

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