title: Total synthesis of beta-lactam antibiotics. IV. Epimerization of 6(7)-aminopenicillins and -cephalosporins from alpha to beta.
mesh_terms: D001547:Benzaldehydes; D002511:Cephalosporins / Q000138:chemical synthesis*; D055598:Chemical Phenomena; D002621:Chemistry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008094:Lithium; D008722:Methods; D010406:Penicillins / Q000138:chemical synthesis*; D011522:Protons; D047090:beta-Lactams
chemical_list: D001547:Benzaldehydes; D002511:Cephalosporins; D010406:Penicillins; D011522:Protons; D047090:beta-Lactams; D008094:Lithium