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Purification of Laboratory Chemicals, 8th Edition by W.L.F. Armarego

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Diosgenin (25R-spirostaen-3β-ol) [512-04-9] C27H42O3, M 414.6, m 204-207°, [α]D25 -129 (in Me2CO). Crystallise the saponin (present in wild yams) from acetone, and chromatograph it on Al2O3 and elute with *C6H6/Et2O (9:1), then recrystallise it from MeOH. Its solubility is ~4% in H2O and 5% in CHCl3. The acetate crystallises from AcOH with m 198°; and has [α]D20 -119 (pyridine). [Marker et al. J Am Chem Soc 65 1199 1943, DOI: 10.1021/ja01246a051; Mazur et al. J Am Chem Soc 82 5889 1960, DOI: 10.1021/ja01507a028; Beilstein 19 IV 862.]

α-Ecdyson (2β,3β,14α,22(R),25-pentahydroxy-7-cholesten-6-one) [3604-87-3] C27H44O6, M 464.7, m 239-242°, 242°, [α]D20 +72 (c 1, EtOH). Recrystallise α-ecdyson from tetrahydrofuran/petroleum ether and from H2O as ...

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