Narcissus tazetta L. (Amaryllidaceae) grows widely in Egypt. It is also cultivated as an ornamental plant and for the production of volatile oil. From N . tazetta a number of alkaloids were isolated',2) which were of great interest because of their effective antitumour3) and antiviral activities, pa
Nitrogen inversion in 9-O-Demethylhomolycorine
✍ Scribed by Anita Latvala; Mustafa A Önür; Tekant Gözler; Anthony Linden; Bijen Kivçak; Manfred Hesse
- Book ID
- 103977080
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 205 KB
- Volume
- 6
- Category
- Article
- ISSN
- 0957-4166
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📜 SIMILAR VOLUMES
We wish to disclose our preliminary studies concerning a new example of relatively slow nitrogen inversion. At room temperature (22') the 60 MHz nmr spectra of 7-methyl-7-azatetrafluorobenzonorbornadienel (I) and 7-methyl-7-azatetrachlorobenzonorbornadiene2 (II) show the expected proton absorption
## Abstract The nitrogen inversion barriers of nine 3,6‐dihydro‐1,2‐oxazines are discussed. Polar solvents were found to increase the nitrogen inversion barriers which, in turn, decrease with increasing size of the __N__‐substituent.