Mass spectra of dihydroxy stereoisomers of 3-methoxy-1,3,5(10)-estratrienes
✍ Scribed by Wolfgang Schade; Gerd Schubert; Bruno Schönecker
- Publisher
- John Wiley and Sons
- Year
- 1988
- Tongue
- English
- Weight
- 414 KB
- Volume
- 23
- Category
- Article
- ISSN
- 1076-5174
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## Abstract The enantiomerically pure (+)‐3‐methoxy‐1, 3, 5 (10)‐estratrien‐11, 17‐dione **11** (with __trans‐anti‐trans__ configuration) was synthesized in a highly stereocontrolled fashion from (±)‐__t__‐butyl 4‐methoxy‐1‐benzocyclobutene carboxylate **(8)** and the (+)‐carboxylic acid **6**, obt
Electron impact-induced fragmentations of 2-substituted 5,5-bis(carboethoxy)l,3-dioxanes were studied by exact mass measurements and metastable ion analysis. The substituent R on C(2) of the heterocyclic ring has little influence on the principal cleavage reactions. Elimination of CH,O/CO and C,H,O/