Mass spectrometry in structural and stereochemical problems. CCXXXIII. Stereochemical dependence of the retro-Diels-Alder reaction
β Scribed by Hammerum, Steen.; Djerassi, Carl.
- Book ID
- 125974778
- Publisher
- American Chemical Society
- Year
- 1973
- Tongue
- English
- Weight
- 250 KB
- Volume
- 95
- Category
- Article
- ISSN
- 0002-7863
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π SIMILAR VOLUMES
IN continuation of our studies3 on the alkaloidal constituents of Brazilian Aspidosperma species, we have investigated the stem bark of Aspidosperma album (Vahl) R. Bent., which was collected in Manaus, Amaronas. The non-phenolic portion yielded the lcnown alkaloid4 (-)-quebmchamine, while from the
SOMETIME ago,2 there was isolated from Amsonia Tabernaemontana Walt. (fam. Aoocvnaceae) a new alkaloid, named tabersonine. The analytical data (C H 2. 24\_26N202), the high rotation of the hydrochloride ([a],-310"), and especially the characteristic ultraviolet and infrared spectral properties 3 ind