𝔖 Bobbio Scriptorium
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β-Methyl-umbelliferon als fluorescierender Indikator

✍ Scribed by C. Bülow; W. Dick


Book ID
112533326
Publisher
Springer
Year
1928
Tongue
English
Weight
302 KB
Volume
75
Category
Article
ISSN
1618-2650

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✍ Hans Jörg Koch; Hans Pfenninger; Walter Graf 📂 Article 📅 1975 🏛 John Wiley and Sons 🌐 German ⚖ 647 KB

## Abstract Starting from 3‐oxo‐17β‐hydroxy‐Δ^1^‐5α‐androstene (2b) the preparation of 1‐oxo‐2‐methoxy‐4α‐methyl‐17β‐hydroxy‐Δ^2^‐5α‐androstene (9), a compound with the ring A structure of quassine (1) is described. The key problem of the reaction sequence is shown to be the monomethylation at C(4)