Gold(III) π-Allyl Complexes
Résumé
Gold(III) pi-complexes have been authenticated recently with alkenes, alkynes and arenes. The key importance of Pd(II) pi-allyl complexes in organometallic chemistry (Tsuji-Trost reaction) prompted us to explore gold(III) pi-allyl complexes, which have remained so far elusive species. The (P,C)Au(III)(allyl) and (methallyl) complexes 3 and 3' were readily prepared and isolated as thermally and air-stable solids. Spectroscopic and crystallographic analyses combined with detailed DFT calculations support tight quasi-symmetric eta3-coordination of the allyl moiety. The pi-allyl gold(III) complexes are activated towards nucleophilic additions, as substantiated with β-diketo enolates.
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