N-Chelate olefin platinum 0 Complexes

A toluene solution of (dmphen)(propene)platinum could be obtained according to the above procedure. Although its isolation at room temperature was not achieved owing to decomposition, satisfactory yields of reaction products with electrophiles could be obtained.12-13 

This procedure is useful for the preparation of the complexes listed in Table I (with the exception of the ethene derivative) as well as many others where the olefin bears electron-withdrawing substituents. The yields are higher than 80%. 

The color of the (N,N-chelate)(olefin)platinum(0) complexes described in this section varies from light to dark yellow. These complexes are air stable and are fairly soluble in chloroform or methylene chloride. The stability in solution increases as the electron-withdrawing properties of the alkene increase. For example, the fumarate or maleate derivatives decompose very 

Olefin Me(H)-CN OMe Carbon Calcd. Found Hydrogen Calcid. Found Nitrogen Calcd. Found 

Aoyagui, Bull. Chem. Soc. Jpn., 58, 2323 (1985). More recent syntheses also used the same approach, which involves bis(dibenzylideneacetone)platinum(0) as starting material R. van Asselt, C. J. Elsevier, W. J. J. Smeets, and A. L. Spek, Inorg. Chem., 33, 1521 (1994). 

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