| Abstract |
[PtCl2(RCN)(2)] (1a R=CH2CO2Me, 1b R=CH2Cl) prepared upon EtCN replacement at [PtCl2(EtCN)(2)] by the appropriate organonitrile, react with a cyclic nitrone O—N+=CHCH2CH2C(Me)(2), under mild conditions, to give, in an unprecedented single-pot synthesis involving spontaneous N-O bond cleavage, the ketoimino complexes trans-[PtCl2\RC(=O)N=CN(H)C(Me)(2)-CH2CH2\(2)] (2a, 2b) with two (pyrrolidin-2-ylidene) amino ligands. The analogous 2c(R=Et) and 2d(R=Ph) are formed by treatment with H-2, in the absence of any added catalyst, of the Delta(4)-1,2,4-oxadiazoline complexes trans-[PtCl2\N=C(R)ONC(Me)(2)CH2CH2CH\(2)] (3a R=Et, 3b R=Ph) derived from the [2+3]-cycloaddition of the cyclic nitrone with the appropriate organonitrile complex of type 1. The compounds were characterized by elemental analyses, IR, H-1, C-13 and Pt-195 NMR spectroscopies, F AB mass spectrometry and X-ray structure analyses for 2a and 2d. |
