Organogold compounds aryls

Apart from these compounds with l,l/-bis(diphenylphosphino)ferrocene, other organogold(I) complexes containing lj -ferrocenediyl (Fc/) or 2,2/-bis(dimethylamino-methyl)ferrocenediyl (FcN/), such as bidentate aryl ligands, have been reported.106 They are also obtained via the organolithium, which is treated in this case with [AuCl(PPh3)] in a 1 2 molar ratio [see Eq. (40)]. 

The stability of the c-metal IB-carbon bond follows the order alkyl-M < aryl-M alkenyl-M < alkynyl-M [M = Cu(I), Ag(I), Au(I)L]. However, for Cu(I) and Ag(I), most alkyl, aryl and alkenyl compounds are only stable at < 0°C Furthermore, the stable organogold(I) species, with a few exceptions, have the general formula RAu(I)L, in which L is a neutral two-electron donor ligand. 

Complexes of this type may contain a variety of orgaiuc residues R, such as alkyl, vinyl, alkynyl or aryl. The neutral donor group L is most commonly a tertiary phosphine or an isocyanide ligand, and polynuclear complexes with bridging polyfunctional donor ligands are also known . From a practical point of view, the series of organogold(I) and isocyanide complexes is of particular interest since some of its members hold promise as precursors for the chemical vapour deposition of gold films. A selection of these and other compounds of the type [RAuL] is presented in Tables 1-3. 

Additional examples of Au(I)/Pd(II) transmetallation have been reported [322], and palladium has been found essential to catalyze couplings involving organogold(I) compounds [314]. Complexes [AuR(PPh3)] also react with aryl and allyl electrophiles in cross-coupling reactions in the presence of palladium [323, 324] or nickel catalyst [325]. 

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