Hexachloroplatinic acid

Controlled synthesis of AB, ABA and (AB)n type PEO (A) and PDMS (B) copolymers by hydrosilation of mono- or diallyl-terminated PEO oligomers and telechelic (Si—H) terminated PDMS oligomers were reported by Haesslin 263). Hydrosilation reactions were conducted in bulk, at 90 °C, in the presence of hexachloroplatinic acid catalyst. Completion of the reactions were monitored by H-NMR, GPC and VPO. The molecular weights obtained were in good agreement with theoretical expecta-... 

Figure 9.13. Preparation of a bifunctional Pt/Al203 catalyst. The alumina support is impregnated with an aqueous solution of hexachloroplatinic acid (H2PtCl6) and HCl.The competitive adsorption between C and...

Silicon substituents can be introduced into alkenes and alkynes by hydrosilation.70 This reaction, in contrast to hydroboration, does not occur spontaneously, but it can be carried out in the presence of catalysts such as H2PtCl6, hexachloroplatinic acid. Other catalysts are also available.71 Halosilanes are more reactive than trialkylsilanes.72... 

For transition-metal catalyzed hydroxylation of alkane C-H bonds, the reactions of alkanes with platinum(II) complexes were the most successful. In an aqueous solution of hexachloroplatinic acid and Na2PtCl4, alkanes were converted into a mixture of isomeric alkyl chlorides, alcohols, and ketones, and the platinum(IV) is reduced to platinum(II).7 The kinetics of the reaction with methane as the alkane have been described in detail.8... 

The NH4-Y (CBV712, ao = 24.35 A), H-Beta (CP811E-75), NH4-Beta (CP814E) zeolites were obtained from Zeolyst International. The NH4-Y and Beta zeolites were transformed to proton forms through step calcination procedure in a muffle oven. Zeolites containing 1 wt-% platinum were prepared by wet-impregnation method using hexachloroplatinic acid as the Pt-source. 

Evaporation of a solution of hexachloroplatinic acid with a deficiency of potassium azide, or with an equivalence of ammonium azide gives explosive residues. Evaporation of a solution of the acid with an equivalence (8 mol) of potassium azide leads to explosion of the cone, solution of the title compound. 

G.S. Attard, P.N. Bartlett, N.R.B. Coleman, J.M. Elliott, and J.R. Owen, Lyotropic liquid crystalline properties of nonionic surfactant/H20/hexachloroplatinic acid ternary mixtures used for the production of nanostructured platinum. Langmuir 14, 7340-7342 (1998). 

Most alkaloids are isolated from plant extracts by conversion into the difficultly soluble salts which they form with complex acids such as hexachloroplatinic acid, chlorauric add, phosphotungstic add, hydroferro-cyanic add, Rdnecke s add, etc. Perchloric add, picric add, flavianic add, mercuric chloride, iodine in potassium iodide are also used. 

Formula H2PtCl6 MW 409.81 crystallized as a hexahydrate, H2PtCl6 6H2O Synonyms chloroplatinic acid hexachloroplatinic acid hexachloro platinic-(IV) acid... 

Hexachloroplatinic acid is obtained in an intermediate step during extraction of platinum from minerals. The compound is formed when platinum is dissolved in aqua regia containing a higher proportion of HCl and subsequently is evaporated repeatedly with hydrochloric acid, preferably in a chlorine atmosphere. Alternatively, hexachloroplatinic acid may be obtained by dissolving platinum tetrachloride, PtCh, in water. 

Pure hexachloroplatinic acid may be prepared by dissolving platinum sponge in hydrochloric acid under chlorine. 

Hexachloroplatinic acid decomposes completely when ignited, leaving a residue of spongy platinum. Hexachloroplatinic acid on heating at 300°C in chlorine forms platinum tetrachloride ... 

Hexachloroplatinic acid may be reduced to tetrachloroplatinic(II) acid, H2PtCl4, by sulfur dioxide and other reducing agents. 

It also may be obtained by thermal decomposition of platinum tetrachloride, PtCh, or hexachloroplatinic acid ... 

Harris and Dranoff [115] appear to have been the first to use the LSPP model to study the performance of a photochemical reactor for scale-up purposes. Experimentally, two sizes of perfectly mixed photochemical reactor were used for the decomposition of hexachloroplatinic acid in dilute aqueous solution, and the result of the theoretical analysis was acceptable in comparison with the experimental data. 

Evaporation of a solution of hexachloroplatinic acid with a deficiency of potassium azide, or with an equivalence of ammonium azide gives explosive residues. 

If platinum/carbon or hexachloroplatinic acid is taken as catalyst the trans products 3a, b are obtained stereospecifically via cis addition whereas peroxide catalysis leads to the cis-products 4a, b under trans addition with equal selectivity. 

Hydrosilylation is by far the most important route for obtaining monomers and other precursors to fluorinated polysiloxanes. Hydrosylilation80 is the addition of silicon hydride moiety across an unsaturated linkage using transition metal complexes of platinum or rhodium such as Speier s catalyst, hexachloroplatinic acid in isopro-... 

The next step is the hydrosilation reaction that is used to attach an organic moiety [22,23], An olefin/catalyst (usually hexachloroplatinic acid) solution (pure olefin or olefin dissolved in toulene) is heated to 60-70°C for a period of 1 h. The hydride capillary filled with toluene is then flushed with the reacting solution for a period of 45 h at 100°C. After completion of the hydrosilation reaction, the capillary is washed successively with toluene and THF for 1 h. After the washing step, the capillary is then dried at 100°C under a nitrogen flow overnight. 

The hydrosilylation/methanolysis reaction sequence. One of the most convenient methods is to use a sequence of hydrosilylation/methanolysis reactions as shown in equation 4 for the formation of 39. This direct synthetic pathway was reported in cases of the alkyl family of precursors 1290. This sequence is also used for the preparation of dendrimers and arborols121,123. Alternatively, hydrosilylation with HSi(OEt)3 can be performed advantageously in the case of dendrimers125,126 but it is of more interest in the case of carbonate precursors 26111. Indeed, hydrosilylation of double bonds can be achieved selectively in the presence of a carbonyl group with hexachloroplatinic acid or a rhenium catalyst130. 

The relative weights of hexachloroplatinic acid to sodium nitrate used for fusion, f Each (1 wt% of Pt oxide) was added dissolved in a drop of water. 

Reactions of the hexachloroplatinate(IV) ion lPtCl6]2 To study these reactions use a 0-5m solution of hexachloroplatinic acid [hydrogen hexachloro-platinate(IV)]. 

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