Gold complexes electron-deficient

As already mentioned, CAAC ligands can stabilize electron-deficient metal centers such as in cationic gold complexes. Complex 29 catalyzes a very unique reaction of enamines with acetylene, which produces a cumulene and an imine... 

Ferrocenylgold compounds have been prepared by the organoUthium method and auration of one or both of the cyclopentadienyl rings could be achieved. Similar to tetraphenylcyclopentadienylgold(l) phosphine complexes, these compounds can incorporate additional (phosphine)gold(l) units upon interaction with (triphenylphosphine)gold(l) tetrafluoroborate to give electron-deficient species as described below. 

The palladium catalyst when combined with a gold co-catalyst is effective for vinylstannylation of electron-deficient alkynes to give 1-stannyl-1,3-butadienes (Scheme 3-227). " The key to achieve the transformation is the formation of an alkyne-coordinated Au complex. 

Corma A, Gonzalez-Arellano C, Iglesias M, Sanchez R Efficient synthesis of vinyl and alkyl sulfides via hydrothiolation of alkynes and electron-deficient olefins using soluble and hetereogeneous gold complexes catalysts. Appl. Catal. A 2010 375 49-54. 

---