Oxidative Addition Reactions of Binuclear Organoplatinum Complexes With Ditopic Ligands

The chemistry of bis[dimethylplatinum(ii)] complexes of four ditopic ligands based on anthracene [1,8-c14h8(n=ch-2-c5h4n)2, l1, and 1,8-c14h8(cc-4-c6h4-n=ch-2-c5h4n)2, l2] or 2,7-di-t-butyl-9,9-dimethylxanthene [4,5-c23h28o(n=ch-2-c5h4n)2, l3, and [4,5-c23h28o(c(=o)nh- 4-c6h4-n=ch-2-c5h4n)2, l4] backbones. each complex [(ptme2)2(l1)] - [(ptme2)2(l4)] reacted with mei to give the corresponding platinum(iv) complex [(ptime3)2(l1)] - [(ptime3)2(l4)] as a mixture of two isomers which equilibrated slowly at room temperature. the complex [(ptme2)2(l3)] also underwent oxidative addition with phch2br, i2 or hgbr2 to give [(ptbrme2ch2ph)2(l3)], [(pti2me2)2(l3)] or [(ptbrme2)2(hg)(l3)] respectively, the last containing a pt-hg-pt unit. finally, the complexes [(ptime3)2(l3)] and [(ptime3)2(l4)] reacted with silver triflate and pyrazine (c4h4n2) to give the complexes [(ptme3)2(c4h4n2)(l3)][o3scf3]2 and [(ptme3)2(c4h4n2)(l4)][o3scf3]2, respectively, each of which contains a bridging pyrazine ligand