| abstract |
PROCEDURE FOR THE PREPARATION OF ANTIBIOTICS OF LACTAMA, OF GENERAL FORMULA (I), WHERE R IS A RADICAL THAT FORMS WITH CO A CARBOXYL ACID GROUP OR A SALT OR AN ESTER; R IS HYDROGEN OR AN ORGANIC RADICAL; N IS ZERO OR ONE; R AND R ARE INDEPENDENT HYDROGEN OR ALKYL; X IS ALKYLENE; E Y IS AMINO OR AMINO SUBSTITUTE. IT CONSISTS OF SUBMITTING AN ELIMINATION REACTION WITH RING FORMATION, TO AN ESTER OF A COMPOUND OF FORMULA (II), WHERE A, A AND A ARE INDEPENDENTLY PHENYL OR METOXYPHENYL; AND R, R, R, X AND Y HAVE THE MEANINGS ALREADY STATED. |