Gibberelline—XLVI

ChemInform Abstract: CYCLOADDITION OF SINGLET OXYGEN AND 4‐PHENYL‐4H‐1,2,4‐TRIAZOLE‐3,5‐DIONE TO 7‐SUBSTITUTED 1,3,5‐CYCLOOCTATRIENES

“…Except for the two alkyl derivatives 6 (R = Me) and 7 (R = iPr), all the other 7-substituted 1,3,5-cyclooctatrienes in Scheme 1 are known and our physical constants and spectral data matched those reported. The hitherto 'unknown 7-methyland 7-isopropyl-1,3,5-cyclooctatrienes 6 and 7 were fully characterized on the basis of 'H and "C NMR data (Experimental Part). It suffices to say here that the 400 MHz 'H NMR and 100 MHz 13C NMR spectra were rather complex in view of the mixture of stereoisomers of the monocyclic and bicyclic forms 6a, b (X = Me; Y = H) and 7a, b (X = iPr; Y = H) due to the valence isomerization') shown in Eq.…”

Gibberelline. CIII. Synthese von 8‐Amino‐gibbanen

“…BROWN und CROSS [ 21 berichteten uber Versuche zur Darstellung von 8-Amino-gibbanen, die jedoch nur irn Falle der Gibberinsaure zum Erfolg fuhrten. ADAM et al beschrieben die Synthesc von neutralen und basischen Amiden der Gibberellin A,und A,-Reihe [ 31 wowie die S ynthese von Gibberellin-Aniinosiiure-Konjugaten [4]. Weiterhin wurde die Darstellung von 1,2-seco-Gibbanamiden [5] und beschrieben.…”