X-Ray and nuclear magnetic resonance spectroscopic determination of the structure of chloro-[4-(chloro-t-butyl)methylene-2,5-di-t-butyl-1–3-η-cyclopent-2-enyl]triphenylphosphinepalladium and a novel example of stereochemically non-rigid behaviour in allylic complexes

Abstract
The structure of the t-butylacetylene trimer complex [Pd{Cl(Me3CC2H)3}Cl]2(I) has been elucidated from its 1H and 13C n.m.r. spectra as well as by an X-ray structure determination of its triphenylphosphine adduct, [Pd{Cl(Me3CC2H)3}Cl(PPh3)]; complex (I) exists in two η3-allylic forms, an exocyclic and an endocyclic one, which interconvert.

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