Ethene bis phosphine platinum

Phosphine, PR3 = tris(l-methylethyl)phosphine diethylphenylphosphine triphenylphosphine  

The method for preparation of the zero valent ethene complexes is identical to that described in Section A. For less soluble starting materials the reducing agent is best added over a longer period of time (up to 30 min). All complexes are 

Stable in solution. They arc prcparcd in nearly quantitative yield as shown by P NMR spectroscopy (see Table I). 

Solutions of the complexes are stable for several hours at room temperature under an ethene atmosphere. Decomposition takes place if the compound is heated ( 65°). If the solvent is removed under reduced pressure, a red-brown oil of uncertain composition is formed. 

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