The hydrolysis of benzylpenicillin is catalysed by alkoxide ions and other oxygen bases. Catalysis occurs by a nucleophilic pathway and the intermediate ester can be detected in some cases. The Brønsted βnuc for alkoxide ions is 0.97, and is compatible with rate-limiting ring opening of the β-lactam. A solvent isotope effect of 3.2 for the trifluoroethanol-catalysed reaction suggests protonation by water occurs to the departing β-lactam nitrogen. Penicillin is not a particularly effective acylating agent of alcohols.
|Number of pages||5|
|Journal||Journal of the Chemical Society, Perkin Transactions 2|
|Publication status||Published - Aug 1991|