Low temperature NMR studies indicate that the dicationic salts [Zr(eta-C5H4
CMe2C6H4Me-p)(2)](2+)[MeB(C6F5)(3)](-)(2) and [Zr(eta-C5H4CMe2Ph)(2)](2+) [
MeB(C6F5)(3)](2)- are formed when the neutral compounds [Zr(eta-C5H4CMe2Ph)
(2)Me-2] and [Zr(eta-C5H4CMe2C6H4Me-p)(2)Me-2] and [Zn(eta-C5H4CMe2Ph)(2)Me
-2] are treated with 2 equivalents of B(C6F5)(3).