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1 Polish Journal of Chemistry

1 1999

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Nucleophilic additions in Cu(II), Ni(II), Co(II) pseudohalide-4-halogenopyrazole systems

Hvastijova M., Kohout J., Mroziński J., Jager L.

Polish Journal of Chemistry

1999

vol. 73 nr 2

271-278

From M(II)-Y--4-X-pz systems, where M=Cu, Ni, Co; Y=NCO, C(CN)3, N(CN)2; X=Cl, Br, I (pz = pyrazole), new compounds of the type [MY2(4-X-pz)2] and [M(4-X-pz×Y)2] have been prepared. Compounds [M(4-X-pz×Y)2] arise by nucleophylic addition of imine nitrogen from 4-X-pz to cyano carbon of the pseudohalide under formation of five-membered metallocycle. The influence of X substituent on the course of this reaction with various M(II) and Y was investigated. An uncomplete course of nucleophilic addition is revealed by formation of mixed products, consisting of [MY2(4-X-pz)2] and [M(4-X-pz×Y)2]. All compounds were studied by infrared and electronic spectroscopy and probable structures were assigned to the relevant species.