Gold complexes bromides

There is evidence for the formation of an unstable gold(III)-styrenc complex during the reduction of gold(III) bromide by styrene 18). 

Reactions with lodomethane, Hydrogen Bromide, Borane, Organometallic Lewis Acids and Gold Complexes... 

Many homoleptic organogold compounds are Lewis acidic. For example, trimethylgold, prepared from gold(III) bromide and methyllithium, is stabilized by complexation with amines or tertiary phosphines, in Me3Au L. The dimeric compounds, (R2AuX)2, are prepared from [Au(py)Cl3] and me thy lmagnesium iodide76. 

The ligand iso-maleonitriledithiolate was synthesized as the potassium salt, according to the procedure of Gomper and Topel [9]. Its gold complex was obtained by the reaction of potassium tetrachloroaurate with K2(i-mnt)2 in die presence of tetra-n-butylammonium bromide [10]. 

Propargyl alcohols can be converted into vinyl iodides and bromides using a dual catalyst approach (Scheme 7.119) [183]. The combination of a common gold complex with a molybdenum species generated a highly active catalyst for this reaction. The precise... 

Rubidium metal alloys with the other alkaU metals, the alkaline-earth metals, antimony, bismuth, gold, and mercury. Rubidium forms double haUde salts with antimony, bismuth, cadmium, cobalt, copper, iron, lead, manganese, mercury, nickel, thorium, and 2iac. These complexes are generally water iasoluble and not hygroscopic. The soluble mbidium compounds are acetate, bromide, carbonate, chloride, chromate, fluoride, formate, hydroxide, iodide. 

THE CONSTANTS OF REPLACEMENT AND THE CONSTANT OF STABILITE MIXED BROMID-THIOUREA COMPLEXES OF GOLD (HI)... 

Determination. To an aliquot of the silver(I) solution containing between 10 and 50 pg of silver, add sufficient EDTA to complex all those cations present which form an EDTA complex. If gold is present (>250 xg) it is masked by adding sufficient bromide ion to form the AuBr4 complex. Cyanide, thiocyanate or iodide ions are masked by adding sufficient mercury(II) ions to complex these anions followed by sufficient EDTA to complex any excess mercury(II). Add 1 mL of 20 per cent ammonium acetate solution, etc., and proceed as described under Calibration. 

Most Intensification treatments accelerate development as well as increase the effective speed of the photographic material. The gold Intensification is especially notable in this respect, and is of interest in relation to the mechanism of development. A simple motion picture positive film responds well to the gold treatment, which consists simply in bathing the exposed film for a few minutes in a solution containing the aurous thiocyanate complex in the presence of excess thiocyanate and bromide ions. Figure 7 shows the developed densities for several... 

Univalent halides—e.g. NH l.AgCl CsCl.CuCl 2KCl.CuCl etc. The halides of the alkali metals do not often unite together to form stable complexes. Univalent copper, silver, and gold form double chlorides with the alkali halides, while the corresponding double bromides of silver and gold and the double iodide of silver have not been made. The facts can be summarized in the form of a scheme due to P. Pfeiffer (1902), where the hyphens represent compounds which have not yet been prepared ... 

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