Formation of the σ-acetonyl Pt(IV) complex in the reaction of iodoacetone with PtCl 4 2− in aqueous solution

Conclusions The reaction of K₂PtCl₄ with iodoacetone in aqueous solution at about 20C gives the -acetonyl Pt(IV) complex which is more stable to the action of nucleophilic reagents than the analogous methyl and ethyl complexes.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1657–1660, July, 1984.     

Catalytic hydrochlorination of acetylene on mechanochemically-activated K<Subscript>2</Subscript>PdCl<Subscript>4</Subscript>

We report the catalysis of the hydrochlorination of acetylene on the surface of dry K₂PdCl₄ subjected to prior mechanical activation in an atmosphere of acetylene or propylene. The stereochemistry of the reaction corresponds to trans addition of the halogen and hydrogen atoms to the C-C triple bond. The hydrogen halide is the source of the halogen atom in the reaction product. The mechanical activation of K₂PdCl₄, in contrast to the case of K₂PtCl₄, is also capable of activating the C-C double bond: propylene is hydrochlorinated under similar conditions to isopropyl chloride. Translated from Teoreticheskaya i éksperimental'naya Khimiya, Vol. 44, No. 5, pp. 306–309, September–October, 2008.     

Platinum-catalyzed addition of iodomethane to acetylene

The reaction of iodomethane and acetylene in the presence of Pt^II and NaI in acetone gives (E)-1-iodopropene. A possible mechanism involves the intermediate formation of a Pt^IV methyl vinyl derivative by the iodoplatination of acetylene with a reversibly formed a Pt^IV methyl complex and assumes the catalytic character of the process.     

Effect of molecular oxygen on the kinetics and mechanism of the reaction of 2-bromo-1-ethylpyridinium bromide with triethylamine in acetonitrile

The nucleophilic aromatic substitution of bromine into 2-bromo-1-ethylpyridinium bromide (I) in its reaction with triethylamine (II) is accompanied by subsequent oxidation of the intermediates by molecular oxygen dissolved in acetonitrile. The following reaction products were identified: 1-ethyl-2-pyridone, triethylamine N-oxide, and the hydrobromide salt of triethylamine. The reaction kinetics was studied with reagents ratios     

Detection of a β-Chlorovinyl Complex of Platinum(IV) (an Intermediate of Hydrochlorination of Acetylene by HCl Gas) on the Surface of the Mechanically Activated Salt K2PtCl6

We have used NMR spectroscopy to detect an intermediate of catalytic hydrochlorination of acetylene on the surface of the mechanically activated solid salt K₂PtCl₆: a -chlorovinyl complex of platinum(IV).     

Kinetics of Methyl Iodide Tribosorption on the Solid-Phase Salt KI

It was found that the tribosorption of methyl iodide from the gas phase of a closed reactor onto a matrix of KI is described by the rate equation for a reversible first-order reaction v _g – v _{, g} = mv _ts ^* exp(–_td D _sp), where v _g and v _{, g} are, respectively, the current and equilibrium amounts of methyl iodide in the gas phase; v _ts ^* is the equilibrium amount of methyl iodide tribosorbed per gram of salt; m is the mass of potassium iodide; _td is a constant, which characterizes the efficiency of tribodesorption (_td = 0.011 ± 0.005 g/J); and D _sp is the specific dose of mechanical energy absorbed by the KI powder. The value of v _ts ^* monotonically increased with increasing equilibrium partial pressure of methyl iodide and reached a maximum value of 25 mol/g. The lower limit of the constant _td, which characterizes the efficiency of tribosorption, was estimated at 0.1 g/J.     

Estimates of the Catalytic Efficiency of a Heterogeneous Catalyst for Acetylene Hydrochlorination on the Surface of Mechanically Activated K2PtCl6 Salt

Acetylene hydrochlorination by gaseous HCl on the surface of the mechanically activated salt K₂PtCl₆ is shown to occur as a catalytic reaction. Using a modified kinetic distribution method, the specific catalytic activity of the mechanically activated catalyst was found to be equal to 0.2 (mol C₂H₂) (mol Pt)^–1 s^–1.     

Mechanism of alkyl iodide reduction to alkanes in aqueous solutions of Na2PtCl4?NaI?HClO4

Platinum(II) catalyzes the reduction of alkyl iodides to alkanes according to a mechanism involving oxidative addition of RI to Pt(II), reduction of the product complex RPt(IV) to RPt(II) by iodide ions and protolysis of the latter particle.

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(II) , RI Pt^II, - RPt^IV RPt^II .