M.C. Woods

The bitter principle of Jasminum primulinum—II : Structure and reactions of jasminim

Abstract The structure of jasminim 1 , a bitter principle of Jasminum primulinum Hemsl., based on a study of the chemical and physical properties has been confirmed by x-ray analysis.

The structures of fibraurin and a minor product from fibraurea chloroleuca

Abstract Fibraurin, a diterpernoid extracted from Fibraurea chloroleuca, has been shown to have structure 1; a minor product from the same extract has been identified as 6-hydroxyfibraurin (16).

The NMR spectra of taxinine and its derivatives

Abstract The 60 and 100 Mc NMR spectra of taxinine and several of its more important derivatives are assigned and discussed.

Conformation of cyclohexenones : Application of long-range coupling to conformational analysis☆

Abstract NMR spectra of several α,β-unsaturated cyclohexenone derivatives were investigated. Long-range coupling between β-hydrogen and a hydrogenwhich is is observed in magnitude of 1-2 Hz for some compounds. By the application of W-rule to this result and by analysis of vicinal coupling, the conformations of cyclohexenone rings of the above compounds were determined as follows :decalen-1-on-3 derivatives which, show the long-range coupling, exist in cis juncture and non-steroidal conformation. Results obtained were further confirmed by conformational analysis and by consideration of their ORD and CD spectra.