Ketoximes undergo deprotection in CH3CN/acetone/H2O (3:6:1) in the presence of 20–40 mol% BiBr3/5 mol% Bi(OTf)3. Bismuth(III) salts are relatively non-toxic, insensitive to air and inexpensive. These features coupled with the use of a relatively non-toxic solvent system make this method an attractive alternative to existing routes for deprotection of ketoximes.
Mohan, Ram; Arnold, Joshua; Hayes, Patrick; and Kohaus, Robert, "Bismuth Compounds in Organic Synthesis. Deprotection of Ketoximes Using Bismuth Bromide-Bismuth Triflate" (2003). Scholarship. 15.