## Abstract The configurations of 1,4:3,6‐dianhydro‐2,5‐di‐__O__‐mesyl‐D‐mannitol, 1,4:3,6‐dianhydro‐2,5‐di‐__O__‐mesyl‐D‐glucitol, 1,4:3,6‐dianhydro‐2,5‐di‐__O__‐mesyl‐L‐iditol, 1,4:3:6‐dianhtydro‐2‐deoxy‐2‐iodo‐5‐__O__‐mesyl‐D‐mannitol, 1,4:3:6‐dianhtydro‐2‐deoxy‐2‐iodo‐5‐__O__‐mesyl‐D‐glucitol,
Revision of the configuration of the C-4 hydroxymethylene group in buxus alkaloids by N NMR spectroscopy
✍ Scribed by M. Sangare; F. Khuong-Huu; D. Herlem; A. Milliet; B. Septe; G. Berenger; G. Lukacs
- Book ID
- 104215161
- Publisher
- Elsevier Science
- Year
- 1975
- Tongue
- French
- Weight
- 231 KB
- Volume
- 16
- Category
- Article
- ISSN
- 0040-4039
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## Abstract The relative configuration of 11 1,4‐diazaspiro[4.5]decanes (**1a–1j** and **1m**), 15 1,4‐oxazaspiro[4.5]decanes (**2a–2o**) and 10 1,4‐dioxaspiro[4.5]decanes (**3a–3n**) substituted at the 2‐, 6‐, 7‐ or 8‐position by a methyl group or using the __tert__‐butyl group as a model for the
## REFERENCE DATA of the alcohol into the acetate (7) and ketone (ll), respectively. The C-29 signal in 2, however, is virtually unaffected by acetylation (6), while it is appreciably shielded (3.9 ppm) on conversion to ketone 10. Similar shift behaviour was also observed for the C-29 and C-30 sig