Hexestrol tricarbonyl chromium complexes may be used for oestradiol receptor assay by taking advantage of the high sensitivity of Fourier transform i.r. spectroscopy.
the steroidal hormone 11P-(4-dimethylaminopheny1)-17P-hydroxy-17a-(1-propyny1)-estra-4,9-dien-3-one (RU 38486) or with propynylborneol yields in each case a chiral cluster that exhibits two cyclopentadienyl resonances in both the 'H and I3c NMR regimes. At low temperature the interconversion of diastereomers arising from the different orientations of the semi-bridging carbonyl ligand can be slowed on the NMR time scale. The barrier to diastereomer interchange has been determined for the terpenoid cluster and the mechanism of this process is discussed. La reaction du (C,H,)IMo,(CO)4 avec l'hormone steroidale 11~-(4-dim~thylamino)-17~-hydroxy-17a-(l-propynyl)-estra-4,9-dikn-3-one (RU 38486) ou avec le propynylborneol conduit dans chaque cas h un cluster chiral qui presente deux resonances de cyclopentadienyles en RMN tant du 'H que du I3c. A basses temperatures, sur 17Cchelle de temps de la RMN, on peut ralentir l'interconversion des diaster~oisom&res provenant des differentes orientations dans le ligand carbonyle agissant comme demi-pont.[Traduit par la redaction]
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