title: Cyclisation of  -acylamino-acids in the presence of perchloric acid to give 5-oxo-  2 -oxazolinium perchlorates.
mesh_terms: D000215:Acylation; D000596:Amino Acids; D000812:Anhydrides; D003500:Cyclization; D010080:Oxazoles / Q000138:chemical synthesis*; D010472:Perchlorates
chemical_list: D000596:Amino Acids; D000812:Anhydrides; D010080:Oxazoles; D010472:Perchlorates