476152-98-4Relevant academic research and scientific papers
C-H activation and C-C coupling of arenes by cationic Pt(II) complexes
Konze, Wayde V.,Scott, Brian L.,Kubas, Gregory J.
, p. 12550 - 12556 (2007/10/03)
The synthesis and characterization of cationic platinum complexes of the type [(R2PC2H4PR2)- PtMe(OEt2)]BArF (R = Cy, Et) are reported. These electrophilic platinum cations are found to react quantitatively with arenes (benzene, toluene) at room temperature by undergoing intermolecular C-H activation with concomitant C-C coupling to generate complexes of the type [{Pt(R2 PC2 H4PR2)}2(μ-η3: η3-biaryl)][BArF]2. The dianionic biaryl ligands in these compounds exhibit a rare μ-η3:η3-bis-allyl bonding mode and can be removed from the complex with stoichiometric oxidants to generate the free biaryl and [(R2PC2 H4PR2) Pt(μ-X)]2[BArF]2 (R = Cy, Et; X = Cl, I). The cationic platinum complexes [(R2PC2H4PR2)- PtMe(OEt2)]BArF (R = Cy, Et) are also quite reactive with water, forming the bridging hydroxide complexes [(R2 PC2H4PR2) Pt(μ-OH)]2[BArF]2 (R = Cy, Et). A possible mechanism is proposed for the C-C coupling reaction based upon the structures of these bridging biphenyl complexes, which provides a new perspective for the related palladium-catalyzed oxidative coupling of arenes to form biaryls.
