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-1 more stable than its isomeric form C.
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9
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9144233370
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note
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In the case of B1, steric hindrance by the t-butyl group blocks addition of the nucleophile to the ester carbonyl, which is the rate-determining step.
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10
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0020539331
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A parallel for this is found in the intramolecular nucleophilic addition that occurs within the β-lactam-ring-cleaved structure derived from 6(Z)-acetylmethylenepenicillanic acid (a potent β-lactamase inhibitor): M. Arisawa and S. Adam, Biochem. J., 1983, 211, 447-454.
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