Tris- and Tetrakis triphenylphosphine platinum

Tris- and tetrakis (triphenylphosphine) platinum (0) are the source of many platinum compounds. They react with carbon monoxide, acids/ methyl iodide/ fluoroalkyl derivatives/ carbon disulfide/ oxygen/ chloro/ fluoro/ and activated olefins/ hydrogen sulfide and selenide/ and sulfur dioxide/ yielding many platinum (II) or platinum (0) compounds which cannot be obtained easily by other routes. 

Tris- and tetrakis(triphenylphosphine) derivatives of zerovalent platinum can be obtained by reduction of platinum(II) tri-phenylphosphine compounds by alcoholic potassium hydroxide or hydrazine. 1 The tris(triphenylphosphine) derivative is easily obtained from the tetrakis derivative by treatment with hot ethanol, t... 

A solution of tetrakis(triphenylphosphine)platinum (1.24 g., 0.001 mole) [Inorganic Syntheses, 11, 105 (1968)] in benzene (10 ml.) is added to a solution of triphenyl phosphite (1.55 g., 0.005 mole) in benzene (5 ml.). The resultant pale-colored solution is filtered, diluted with n-hexane (25 ml.), and cooled overnight at 5°. The white crystalline product is filtered off, extracted with warm n-hexane (25 ml.) to remove coprecipitated tri-phenylphosphine, and dried in vacuo. Yield is 1.2 g. (84%). The product may be further purified by dissolving in the minimum volume of benzene and reprecipitating by addition of n-hexane (m.p. 148-154°). Anal. Calcd. for C72H60Oi2P4Pt ... 

Tetrachloropalladate(II) ion catalyzes the interconversion of 1- and 2-butenes in aqueous solutions containing chloride and hydronium ions. Sodium tetrachloropalladate(II) catalyzes the conversion of allylbenzene to propenyl-benzene in acetic acid solutions. Tetrakis(ethylene))Lt,/x -dichlororhodium(l) catalyzes butene isomerization in methanolic hydrogen chloride solutions . Cyclooctadienes isomerize in benzene-methanol solutions of dichlorobis-(triphenylphosphine)platinum(11) and stannous chloride. Chloroplatinic acid-stannous chloride catalyzes the isomerization of pentenes. Coordination complexes of zero-valent nickel with tris(2-biphenylyl)phosphite or triphenyl-phosphine catalyze the isomerization of cis-1,2-divinylcyclobutane to a mixture of c/5,m-l, 5-cyclooctadiene and 4-vinylcyclohexene . Detailed discussions of reaction kinetics and mechanisms appear in the papers cited. 

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