Hexafluoroacetone as a Protecting and Activating Reagent: Synthesis of New Types of Fluoro-Substituted α-Amino, α-Hydroxy and α-Mercapto Acids - Osipov, Sergej N; Lange, Torsten; Tsouker, Pavel; Spengler, Jan; Hennig, Lothar; Koksch, Beate; Berger, Stefan; El-Kousy, Salah M; Burger, Klaus (Synthesis, 2004)