Intra- and inter-molecular catalysis in the aminolysis of benzylpenicillin
作者:Jeffrey J. Morris、Michael I. Page
DOI:10.1039/p29800000212
日期:——
for the aminolysis of benzylpenicillin in water is reported. The Brønsted β-values for the uncatalysed, the amine-catalysed, and hydroxide-ion catalysed reactions are 1.0, 1.09, and 0.96 respectively. This indicates that in the transition states for all three pathways the amine nucleophile contains a unit positive charge which is consistent with the formation of a tetrahedralintermediate. Intramolecular