| 摘要 |
<p>1467355 6-Aminopenicillanic and (optionally 3 - modified) 7 - aminocephalosporanic acids GRUPPO LEPETIT SpA 1 Aug 1975 [7 Aug 1974] 34754/74 Heading C2C The title compounds are prepared from their N-acyl derivatives (or salts thereof) by first converting them into anhydrides (in which the CO 2 H group has become COOCOCOZ, where Z is halogen) by reacting with ZCOCOZ, and then reacting the anhydrides with a halogenating agent such as PCl 5 , followed by alcoholysis and hydrolysis.</p> |
