Details

Autor(en) / Beteiligte

• Tondu, Sylvie
• Jaouen, Gérard
• D'Agostino, Michael F.
• Malisza, Krisztina L.
• McGlinchey, Michael J.

Titel

A variable-temperature 13 C NMR study of (η 5 -C 5 H 5 ) 2 Mo 2 (CO) 4 complexes of chiral alkynes derived from a terpene or a hormonal steroid: interconversion of diastereomers via exchange of terminal and semi-bridging carbonyls

Ist Teil von

• Canadian journal of chemistry, 1992-06, Vol.70 (6), p.1743-1749

Erscheinungsjahr

1992

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• The reaction of (C 5 H 5 ) 2 Mo 2 (CO) 4 with the steroidal hormone 11β-(4-dimethylaminophenyl)-17β-hydroxy-17α-(1-propynyl)-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 1 H and 13 C 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.