Etiocholanic Acid
Title: Etiocholanic Acid
CAS Registry Number: 438-08-4
CAS Name: (5b,17b)-Androstane-17-carboxylic acid
Additional Names: aetiocholanic acid; etianic acid; etiocholane-17b-carboxylic acid
Molecular Formula: C20H32O2
Molecular Weight: 304.47
Percent Composition: C 78.90%, H 10.59%, O 10.51%
Literature References: Prepn: Wieland et al., Z. Physiol. Chem. 161, 80 (1926); Jacobs, Elderfield, J. Biol. Chem. 108, 497 (1935); Tschesche, Ber. 68, 9 (1935); Steiger, Reichstein, Helv. Chim. Acta 21, 841 (1938).
Properties: Needles from glacial acetic acid; elongated leaflets from acetic acid. Sublimes at 0.002 mm press. and 160° bath temp, mp 228-229°. Insol in water; sol in pentane.
Melting point: mp 228-229°
Derivative Type: Methyl ester
Molecular Formula: C21H34O2
Molecular Weight: 318.49
Percent Composition: C 79.19%, H 10.76%, O 10.05%
Properties: Needles from methanol, mp 99-101°.
Melting point: mp 99-101°
NOTE: The stem name "etianic acid" was proposed by the Subcommittee on Steroid Nomenclature of the National Research Council as a replacement for "etiocholanic acid" in order to avoid the use of the same name for parent hydrocarbons of different carbon content: J. Am. Chem. Soc. 74, 2817 (1952).

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