Niobium (low valent)
Trifluoromethyl arenes were reduced with lithium aluminum hydride to give toluene derivatives in good yields in the presence of 5 mol % of niobium(V) chloride. Stepwise, partial reduction of a bis(trifluoromethyl) arene was also demonstrated.
K. Fuchibe, Y. Ohshima, K. Mitomi, T. Akiyama, Org. Lett., 2007, 9, 1497-1499.