18 a Unlike complexes of type A that exhibit a clear trend between the effect of steric environment and the outcome of the possible reductive transformations, when the analogous complexes in which the SiMe 3 group had been replaced by the bulkier Si i Pr 3 group were reacted with CO 2 , either intractable reaction mixtures were obtained or the reductive disproportionation of CO 2 was promoted exclusively. 18 b In order to better understand this observation, we envisaged that a study of the reactivity towards other heteroallenes ( e.g.
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Steric control of redox events in organo-uranium chemistry: synthesis and characterisation of U(v) oxo and nitrido complexes.
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