Duality of mechanism in the tetramethylfluoroformamidinium hexafluorophosphate-mediated synthesis of N-benzyloxycarbonylamino acid fluorides. - Fiammengo R; Licini G; Nicotra A; Modena G; Pasquato L; Scrimin P; Broxterman QB; Kaptein B (The Journal of organic chemistry, 2001)