The green to brown hexamethylbenzene metal cluster compounds of stoicheiometries [(Me6C6)3M3X6]+(M = Nb and Ta; X = Cl and Br) are oxidized by a variety of oxidizing agents (e.g. CeIV, I2, N-bromosuccinimide, and air) to give salts of brown cations of the stoicheiometries [(Me6C6)3M3X6]2+(M = Nb and Ta; X = Cl and Br) isolable as their hexafluorophosphate or tetraphenylborate salts.
R. B. King, D. M. Braitsch and P. N. Kapoor, J. Chem. Soc., Chem. Commun., 1972, 1072a DOI: 10.1039/C3972001072A
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