Three situations are observed when the new cobaltocene derivative Co(C
5H4BPr2i)(2) (2) is oxidized. The cobaltocenium salt [2]PF6 (3) is obt
ained with [FeCp(2)]PF6 as oxidant. With Cu(OH)(2) the inverse chelate
[2]OH (4) with a mu-OH group bridging the two boron centers is formed
. Oxidation with C2Cl6 gives a zwitterionic chloride (5) with a trigon
al and a quaternized boron center; in solution 5 is fluxional.