Bifunctional activation of cyanoguanidine. Synthesis and molecular structure of the azametallacycle cis-[(PPh3)2Pt{NHC(OMe)=NC(NH2)=NH}][BPh4]
1997; Elsevier BV; Volume: 265; Issue: 1-2 Linguagem: Inglês
10.1016/s0020-1693(97)05636-3
ISSN1873-3255
AutoresM. Fátima C. Guedes da Silva, Cristina Ferreira, Elsa M.P.R.P. Branco, João J. R. Fraústo da Silva, Armando J. L. Pombeiro, Rino A. Michelin, U. Belluco, Roberta Bertani, Mirto Mozzon, G. Bombieri, F. Benetollo, Vadim Yu. Kukushkin,
Tópico(s)Catalytic C–H Functionalization Methods
ResumoThe cyanoguanidine complex cis-[Pt(NCNC(NH2)2)2(PPh3)2][BPh4]2, prepared by reacting cis-[PtCl2(PPh3)2] with cyanoguanidine in the presence of Na[BPh4], readily reacts with methanol to give cis-[(PPh3)2PtNHC(OMe) = NC(NH2) = NH)] [BPh4] containing a novel type of azametallcycle whose molecuar structure is established by X-ray crystallography. Its formation involves metal-promoted nucleophilic addition of the alcohol to the cyano group of a cyanoguanidine ligand, combined with deprotonation of the guanidine unit which then chelates the Pt(II) centre.
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