Diphenylacetylene bis triphenylphosphine platinum

A mixture of 0.5 g (0.6 mmole) of [Pt[P(C6Hs)3]2(C03)] CeHs and 0.5 g (2.8 mmole) diphenylacetylene is refluxed in 50 mL of ethanol for 4 hours. The mixture is chilled in ice and filtered through a medium-porosity filter. The light-cream-colored product is washed with ethanol (15 mL) and dried in vacuo. The yield is 0.52 g (96%). Anal. Calcd. for PtCsoH4oP2 C, 66.9 H, 4.5. Found C, 66.9 H, 4.5. 

Under a nitrogen atmosphere, 0.4 mL of an 85% hydrazine solution is added dropwise to a stirred suspension of 0.47 g (0.6 mmole) of PtCl2[P(C6H5)3]2 in 25 mL of nitrogen-purged ethanol. The reaction mbcture becomes clear yellow over 2-3 minutes. To this mixture a solution of 0.5 g (2.8 mmole) of diphenylacetylene dissolved in 15 mL of ethanol is added. The mixture is heated to reflux and then allowed to cool slowly to room temperature. After 30 minutes the product is collected on a medium-porosity filter. The compound is washed with 10 mL of water-methanol (1 9) solution and dried in vacuo. The yield is 0.44 g (83%). The checkers obtained 91-95% yields using half the scale given above. 

The compound is an air-stable solid. It is soluble in chloroform, dichloro-methane, and benzene but insoluble in alcohol and diethyl ether. The infrared spectrum of the compound shows v(C=C) at 1740 (s) cm. The melting point is 160-165° (dec.). 

Inorganic Syntheses, Volume XVIII Edited by Bodie E. Douglas Copyright 1978 by John Wiley Sons, Inc. 

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Diphenylacetylene)bis(triphenylphosphine)platinum(0) is useful for the preparation of anionobis(triphenylphosphine)vinylplatinum(II) complexes, as well as the corresponding aniono derivatives. The method can be used to prepare analogous complexes covering a wide range of acetylenes. A similar... 

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