109131-41-1Relevant academic research and scientific papers
Activation of P-C Bonds in Phosphines and Aromatic C-H Bonds in Toluene by Phosphine Complexes of Dichloro- and Dimethylplatinum(II) in Hydrocarbon Media
Vedernikov, A. N.,Zazybin, A. G.,Solomonov, A. B.,Solomonov, B. N.
, p. 68 - 73 (2008/10/08)
According to GLC and (1)H and (31)P NMR data, lipopholic complexes of cis-dichloro- and cis-dimethylplatinum(II), PtX2(L)2 [X=Cl, L=PPh3 (I); X=Me, L=PPh3 (II); X=Cl, L=P(m-CH3C6H4)3 (III); X=Me, L=P(m-CH3C6H4)3 (IV)], II and III slowly react with toluene at 120°C to give productsof activation of aromatic C-H bonds: tolyl chlorides from the dichlorop latinum complex and tolylplatinum derivatives and methane from the dimethylplatinum complex. Benzene does not react with these complexes. Dichlorobis(tri-m-tolylphosphine)platinum(II) also undergoes cis-trans isomerization. Being almost insoluble in benzene and toluene, cis-dichlorobis(triphenylphosphine)platinum(II) (I) neither undergoes isomerization nor reacts with toluene. The P-C bonds in the phosphine ligands of the dimethylplatinum complexes are cleaved both in benzene and in toluene solutions with formation of the corresponding byaryl and arylplatinum complexes.A scheme of activation of C-H bonds in toluene is proposed, which invol ves oxidative addition of the aromatic hydrocarbon to platinum(II) and formation of unstable aryl hydride platinum(IV) complexes.
