title: Syntheses based on 1,2-secopenicillins. Part III. Hydration of 4-(3-substituted prop-2-ynylthio)azetidin-2-ones and a new cephalosporin synthesis.
mesh_terms: D001384:Azetidines; D001385:Azetines; D002511:Cephalosporins / Q000138:chemical synthesis*; D055598:Chemical Phenomena; D002621:Chemistry; D008722:Methods; D010406:Penicillins
chemical_list: D001384:Azetidines; D001385:Azetines; D002511:Cephalosporins; D010406:Penicillins