References
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- Optical rotations of 5 from the DIBAH reduction of 6 were taken after flash chromatography but without subsequent recrystallization in order to avoid enantiomeric enrichment in the purification process.
- For general experimental details, see reference 1b.
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- It is necessary to perform the chromatographic purification via suction filtration. Lengthy chromatographic procedures result in significant loss of optical activity.