Absolute configuration of teucrin-A
ConclusionsThe absolute configuration of teucrin-A, a norditerpenoid fromTeucrium chamaedrys L. has been shown.
Circular dichroism of some steroidal α-ketols and their acetates
Abstract An examination of the CD spectra of certain steroidal α-ketols and their acetates revealed instances where the Cotton effect of the ketone n → π * transition does not obey the octant rule. This was discussed in terms of the conformational preferences of the α-substituents. The relevance of these results to earlier configurational assignments on A-ring α-ketols in the cucurbitacin series was assessed.
Photochemische Reaktionen 7. Mitteilung. Zum photochemischen Zerfall von 3‐Keto‐10β, 17β‐diacetoxy‐Δ1,4‐östradien
Irradiation of 3-keto-10β,17β-diacetoxy-Δ1,4-estradiene (I) with monochromatic light of 254 mμ yielded 17-O-acetyl-estradiol (II) as the major product.