Biaryl formation in the synthesis of endo and exo-platinacycles
The reactions of cis-[Pt2(4-MeC6H4)4(m-SEt2)2] with bifunctional ligands ArCH NCH2(2-XC6H4) containing a C-X bond at the ortho positions of the benzyl ring (Ar = 4-ClC6H4, X = Br (1d); Ar = 2,4,6-(CH3)3C6H2, X = Br (1e); Ar = 2,4,6-(CH3)3C6H2, X = Cl (1f); Ar = 2-CH3C6H4, X = Br (1h); Ar = 2,6-F2C6H...
| Autores: | , , |
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| Formato: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2011 |
| País: | España |
| Recursos: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:2445/214833 |
| Acesso em linha: | https://hdl.handle.net/2445/214833 |
| Access Level: | acceso abierto |
| Palavra-chave: | Química inorgànica Platí Cristal·lografia Lligands Inorganic chemistry Platinum Crystallography Ligands |
| Resumo: | The reactions of cis-[Pt2(4-MeC6H4)4(m-SEt2)2] with bifunctional ligands ArCH NCH2(2-XC6H4) containing a C-X bond at the ortho positions of the benzyl ring (Ar = 4-ClC6H4, X = Br (1d); Ar = 2,4,6-(CH3)3C6H2, X = Br (1e); Ar = 2,4,6-(CH3)3C6H2, X = Cl (1f); Ar = 2-CH3C6H4, X = Br (1h); Ar = 2,6-F2C6H3, X = Br (1i)) in refluxing toluene were studied. Several types of platinum(II) cyclometallated compounds containing a biaryl linkage were obtained: i) endo-five-membered with a Pt-C(sp2) bond (2d, 2h), ii) endo-six-membered with a Pt-C(sp3) bond (2e, 2f), and iii) exo-five membered with a Pt-C(sp2) bond (2i). The formed biaryl linkage involves the metallated ring for 2i and the non-metallated ring for the endo-metallacycles. The reaction of compounds 2 with PPh3 produced the corresponding phosphine derivatives, some of which (3d, 3e, 3h and 3i) were characterised crystallographically. In addition, compound [PtBr{2-CH3C6H3C6H4CH NCH2(2-C6H4Br)}SEt2] (2c) containing a seven-membered endo-metallacycle was also obtained and characterised crystallographically. |
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