The reaction of 1,2-diaminoethane monocation with benzylpenicillin shows a rate enhancement of ca. 100-fold compared with a monoamine of similar basicity; this is attributed to intramolecular general acid catalysis which in turn indicates that nucleophilic attack takes place from the least hindered α-side in disagreement with the prediction of the theory of stereoelectronic control.
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Martin et al. (1979) studied this question.
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