Gold acyls and imidoyls prepared from anionic Fischer-type carbene complexes

CO Extrusion in Homogeneous Gold Catalysis: Reactivity of Gold Acyl Species Generated through Water Addition to Gold Vinylidenes

“…Their transmetalation onto a gold fragment often leads to gold acyl species that are still coordinated to the original metal fragment 6. To date, only one free gold acyl complex has been reported 7. Besides, to the best of our knowledge, no reports on the reactivity of these species exist.…”

“…[1a, 3] On the other hand, such reactions are well known for vinylidene complexes of other metals. [7] Besides, to the best of our knowledge, no reports on the reactivity of these species exist. The latter can either eliminate the whole organic fragment as an aldehyde or extrude CO, thereby forming the respective metal carbonyl and an organic product (Scheme 1, upper part).…”

“…[6] To date, only one free gold acyl complex has been reported. [7] Besides, to the best of our knowledge, no reports on the reactivity of these species exist. Therefore, the addition of water to intermediately formed gold vinylidenes would not only allow a new access to these species without the need for preformed organometallic reagents that require the exclusion of air and moisture, but also enable us to gain first mechanistic insight into the reactivity of these compounds.…”

Pentacarbonyl[methyl(n-propylsulfanyl)carbene]chromium(0)

“…In our ongoing study of the chemistry of Fischer-type carbene complexes, we have focused on the utilization of simple derivatives as organometallic synthons (Raubenheimer et al, 2002(Raubenheimer et al, , 2005. In a recent report (Raubenheimer et al, 2006), we discussed the reaction of deprotonated thiocarbene complexes with the electrophile Ph 3 PAu + to afford mercaptovinyl complexes of Au that are S-coordinated to the M(CO) 5 (M = Cr, W) unit of the original Fischer carbene complex.…”

CO‐Extrusion in der homogenen Gold‐Katalyse: Reaktivität von Goldacyl‐Spezies, erzeugt durch Wasser‐Addition an Goldvinylidene

“…[6] Bislang wurde nur über einen freien GoldacylKomplex berichtet. [7] Auch existieren unseres Wissens keine Berichte über die Reaktivität dieser Spezies. Daher würde die Addition von Wasser an intermediär gebildete Goldvinylidene nicht nur einen neuen Zugang zu diesen Spezies darstellen, der ohne luft-und feuchtigkeitsempflindliche metallorganische Reagentien auskommt, sondern uns auch ermçglichen, erste mechanistische Einblicke in die Reaktivität dieser Verbindungen zu erhalten.…”