In the peptide field, Palladium, 11722 is a useful selective catalyst for deprotection of the benzyl hydroxamates: Tetrahedron Lett., 36, 197 (1995). For use in the formation of nitrones from carbonyl compounds and their use in cycloaddition reactions, see: J. Org. Chem., 47, 2328 (1982); 52, 2179 (1987).