Gold complexes ether

Anionic alkoxy Fischer-type carbene complexes were shown to react with (Ph3P)AuGl to give a unique vinyl ether complex, which is bound in a quasi-771 fashion to the Cr/Mo centers. Upon treatment with triphenylphosphine, the gold-vinyl ether ligand can be liberated and isolated. This reaction thus gives access for the first time to aurated vinyl ethers (Scheme 57).38... 

Espinet also investigated liquid crystalline gold complexes (Scheme 76) of crown ether isocyanides 139 [142],... 

The nucleophilic addition of alcohols to alkynes was reported by Utimoto with NaAuCU and later by Teles with cationic gold complexes.The enol ethers formed can be hydrolyzed to form carbonyl compounds or trapped as ketals (equations 4 and 5). An intramolecular version of this reaction was reported by the group of Genet to give bicyclic ketals (equation On the basis of this concept, a glycosidation... 

It is well known that small cations form crown-ether-like associations with PEG polymers (77). The cations interact with pseudocrown ether structures of the polymers formed by coiling of the macromolecules. Furthermore, it has been shown that AuCU" ions become coordinated to the pseudocrown ether structures via ion-pairs (76). The Au(IU) complexes are attracted through electrostatic interactions to cations that are bound to the oxyethylene groups of the polymers. In our systems Na+ ions can bind to the pseudocrown ether structures, and form ion-pairs with the gold complexes. The bound complexes are reduced via oxidation of the oxyethylene groups by the metal center ... 

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