A variable-temperature I3C NMR study on a series of monocyclic oxyphosphoranes enabled us to examine the influence of the conformational transmission effect on the barriers to pseudorotation in pentacoordinated phosphorus compounds. It is demonstrated that the pseudorotation rate of monocyclic oxyphosphoranes exhibiting the conformational transmission effect is 2-4 times faster as compared to their counterparts in which the effect is absent. It is shown that the conformational change in the basal ligands of the intermediate SP structures, due to the conformational transmission effect, is responsible for the lowering of the activation barriers by 2-3 kJ.mol-I.

Der Tetracyclus (I) reagiert mit N‐Chlorsuccinimid (NCS) zu den Chlorhydrinen (II) und (III), die über das α‐Epoxid (IV) in das Östrogen‐Analoge (V) übergeführt werden.

075ChemInform Abstract (300-MHz 1H NMR conformational analysis study of (I) and their tetracoordinated counterparts Si(OCH2CH2-XMe)4).

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