Process for preparing aloe-emodin
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United States of America Patent
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Nov 18, 2008
Grant Date -
May 29, 2008
app pub date -
Nov 11, 2005
filing date -
Nov 12, 2004
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Abstract
A process for preparing aloe-emodin from aloin by oxidizing aloin by treatment with an oxygen-containing gas in the presence of an acid. The aloe-emodin may be used for the production of rhein and diacerein by oxidizing aloe-emodin by treatment with a chromium-free oxidizing medium to obtain rhein and purifying the rhein obtained. The rhein may be acetylated to obtain diacerein.
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