1H-NMR.-, 13C-NMR.-, UV.- und CD.-Daten von synthetischem (3S, 3′S)-Astaxanthin,seinem 15-cis-Isomeren und einigen analogen Verbindungen

¹H-NMR., ¹³C-NMR., UV. and CD. spectral data of synthetic (3S, 3′S)-astaxanthin, its 15-cis isomer, and some related compounds ¹H-NMR., ¹³C-NMR., UV. and CD. spectra are reported for synthetic (3S, 3′S)-astaxanthin ( 1 ), its 15-cis isomer ( 2 ), its diacetate ( 3 ), and the 15, 15′-didehydro compound ( 5 ). These data prove the identity of the synthetic and the naturally occuring compound 1 . A full interpretation of the ¹H- and ¹³C-NMR. spectra is given and confirms the configuration of all the double bonds. The conformation of the cyclohexene end group of all the compounds is shown to be identical. The signs of the different CD. maxima of 15-cis-astaxanthin are found to be opposite to those of the all-trans compound.     

Arylsulfonylureido- und Arylsulfonylamidoacyl-Derivate von Hydroxy- und Oxo-cycloalkanen als potentielle Antidiabetica, 5. Mitt.: (1R)-, (1S)-, (1RS)-3-endo-Tosylureido-borneol und (1R)-3-endo-Tosylureido-isoborneol

Ohne Zusammenfassung

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Arylsulfonylureido- and Arylsulfonylamidoacyl Derivatives of Hydroxy cycloalkanes as potential antidiabetica (V): (1R)-, (1S)-, and (1RS)-3-endo-tosylureido borneol and (1R)-3-endo-tosylureido isoborneol

     

α- und β-Phenylazo-styrole Oxidationsprodukte von Arylhydrazon-Verbindungen, 13. Mitt.

The reaction of phenylhydrazones of phenyl- and benzylketones2 with I₂ in pyridine followed by alkali treatment yields - and -phenylazo-styrene derivatives4 and5 respectively. The increasing bulkiness of an additional hydrocarbon substituent attached to the olefinic moiety affects the stereochemistry of the heterodiene system of these compounds as evidenced by their spectra.

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12. Mitt.:J. Schantl, Mh. Chem.105, 427 (1974).