Process for preparing high purity 3-.alpha.-7-.beta.-dihydroxycholanic acid
US5117017A · kind A · utility
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Key dates
| Filing date | Sep 6, 1991 |
| Grant date | May 26, 1992 |
| Priority date | — |
| Expiry date | Sep 6, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07J9/005
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for preparing 3-.alpha.-7-.beta.-dihydroxycholanic acid from a crude product containing up to 15% by weight of 3-.alpha.-7-.alpha.-dihydroxycholanic acid and up to 1% by weight of 3.alpha.-hydroxycholanic acid, by esterifying with methanol, crystallizing from a mixture of solvents consisting of methanol, an aromatic solvent and water and recrystallizing from a mixture of methanol, aromatic solvent and water.
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