Organogold formation

In Section 2, the principles of formation of gold-to-carbon bonds have been introduced. The primary products can be transformed into other organogold species with the creation of more Au bonds than initially present. Au-C bonds are generally retained and only the other substituents or ligands are replaced. 

Elemental analysis generally poses no problems because of the limited stability of the compounds and the formation of elemental gold in decomposition and combustion, which does not form carbides, nitrides, or other interstitial phases. Atomic absorption and inductively coupled plasma spectroscopy are presently the methods of choice for An estimation. Many organogold compounds are sufficiently volatile to allow registration of good mass spectra by gas-phase electron impact. Field desorption, fast-atom bombardment, and chemical ionization mass spectrometry have also been successfully applied. 

In intramolecular reactions, both exo- and endo-mode cyclizations may be observed. In a study of chromene formation, endo-cyclization giving the chromene 6.194 was generally the preferred pathway the observation of the 5-exo product 6.193 was attributed to fragmentation of the organogold intermediate 6.191 prior to protonation, to give an allenic intermediate 6.192, followed by cyclization (Scheme 6.90). ... 

Then, we studied the reactivity of different organogold complexes with electrophiles. While with (D" ), I", Br, and Cl" donors always a formation of a bond between carbon and these electrophiles was observed, with donors, always a C-C bond formation was induced, in this case a homodimerization (Scheme 9) [71] for a detailed full paper on this chemistry, see [72]. 

Scheme 9 A new reactivity pattern - F -induced C-C bond formation in stoichiranetric reactions of organogold(I) compounds...

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