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Westphalen-Lettré rearrangement
The Westphalen-Lettré rearrangement is a classic organic reaction in organic chemistry (named after its inventors) describing a rearrangement reaction of cholestane-3β,5α,6β-triol diacetate with acetic anhydride and sulfuric acid. In this reaction one equivalent of water is lost, a double bond is formed at C10-C11 and importantly the methyl group at the C10 position migrates to the C5 position T.
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