Abstract
Abstract The reaction of dimeric π-allyl palladium chloride with 1-azadienes 1 ( R -N = CH-CH = CH-R') affords the mononuclear complexes (π-Allyl)Pd(L)Cl 2. Two independent intramolecular rotational motions are detected by NMR methods. These complexes (with R ' = Aryl) react with silver tetrafluoroborate, preferentially in the presence of 1, to the cationic complexes [(π-Allyl)Pd(L)2]+ BF4 -, 3, which are also non-rigid with respect to ligand rotation on the NMR time scale. Complexes 3 catalyse the 2 :1-cyclo-cooligomerization of butadiene and 1-azadienes. This reaction to compounds 4 constitutes the first example of a very regio- and stereoselective formation of cyclohexanes from three C = C double bonds. The structure, substitution pattern and conformation of 4 are assigned on the basis of 2D -correlation NMR spectroscopy.
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