Dichloro dianilinomethylene triethylphosphine platinum II

tarns-[[ANILINO(ETHYLAMINO)METHYLENE]CHLOROBIS(TRI-ETHYLPHOSPHINE)PLATINUM(II)] PERCHLORATE 

The methylamino derivative is prepared from an excess of methylamine, passed as gas into a benzene suspension of the isocyanide complex, which dissolves as the reaction proceeds. Subsequent work-up is same as in Section C. 

The isocyanide and carbene complexes are all colorless or white, air-stable, crystalline solids. The molecular structures of the cis isomers have been established by X-ray crystallography.2 The isocyanide complexes have a strong 1R absorption [(N-C) stretching] in the range 2150-2280 cm 1 for example, cis-PtCl2(PhNC)(PEt3) has at 2190 cm 1 (Nujol mull). The carbene com- 

Prepared according to A. C. Smithies, P. Schmidt, and M. Orchin, Jnorg. Synth., 12, 240 (1970). 

The following procedure can be extended to prepare l-oxacyclopent-2-ylidene chromium complexes substituted in the 3 or 5 position.4 Thus the reaction of the anion of pentacarbonyl(l-methoxypropylidene)chromium(0) with ethylene oxide gives pentacarbonyl [dihydro-3-methyl-2(3//)-furylidene] chromium(O) [pentacarbonyl(3-methyl-l-oxacyclopent-2-ylidene)chromium(P)], and the reaction of the anion of pentacarbonyl(l-methoxyethylidene)chromium(0) with propylene oxide gives pentacarbonyl(dihydro-5-methyl-2(3//)-furanylidene)-chromium(O) [pentacarbonyl(5-methyl-l-oxacyclopent-2-ylidene)chromium(0)]. 

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