Dichlorobis pyridine 2-phenyl-1,3-propanediyl platinum

The bis(pyridine) derivatives are prepared by stirring dichloro(l,3-pro-panediyl)- or dichloro-substituted(l,3-propanediyl)platinum (0.2 g) with pure pyridine (0.2 g) in dry chloroform (2 ml) for a few minutes. The solution is passed through a short column of silica gel (6 g) and washed through with chloroform (10 ml). Evaporation of the eluate in vacuo and recrystallization of the residue gives the derivatives listed in Table I. Anal. Calcd. for trans-dichlorobis(pyridine)(2-phenyl-l,3-propanediyl)platinum C, 42.1 H, 3.7 Cl, 13.9 N, 5.2 Pt, 36.0. Found C, 41.7 H, 3.7 Cl, 13.2 N, 5.2 Pt, 36.6. 

Dichloro(l, 3-propanediyl)platinum and its bis(pyridine) derivative have been studied by a number of authors. Dichloro(l,3-propanediyl)platinum, and the corresponding substituted 1,3-propanediyl platinum compounds release the parent cyclopropane on treatment with potassium cyanide, potassium iodide, a tertiary phosphine, carbon monoxide, and other ligands.2,6 Reduction by means of hydrogen or lithium aluminum hydride yields chiefly isomeric substituted propanes. Dichlorobis(pyridine)(l,3-propanediyl)platinum in refluxing benzene yields a pyridinium ylid complex, - (CH3CH2CHNC5Hs)-PtpyCla. 

Silver olefin compounds have been studied extensively for over 30 years. The majority of the compounds are stable only in solution and many have been characterized via stability constant studies. Solid relatively unstable salts have been prepared having the stoichiometry Ag ,(olefin)nX , where X is usually the nitrate, tetrafluoroborate, or perchlorate anion, m = 1,2, and n = 1,2, 3.1 Recently, relatively stable, nonionic, monomeric complexes of the type y diketonato(olefin)silver(I) have been characterized.2 

AgNOa + CgHi2 -5 Ag(C8Hi2)N03 C5H2F6O2 + NaOH NaCsHFeOa 4- H2O 

Commercially available 1,5-cyclooctadiene and 1,1,1,5,5,5-hexafluoro-2,4-pentanedione are used as received. The preparations are performed in air. The operations should be performed in a hood since both reactants are very malodorous. 

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