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For the corresponding enzyme (oxynitrilase) mechanism, it was found that the addition step of the nucleophile on the aldehyde carbonyl is the rate-determining step (see: Ching, W.-M.; Kallen, R. G. J. Am. Chem. Soc. 1978, 100, 6119-6124). This seems to be the case in the catalysis by dipeptide 1 also, since electron-poor aldehydes are reported to react in shorter reaction times than their electron-rich counterparts (compare Figure 13).
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For the corresponding enzyme (oxynitrilase) mechanism, it was found that the addition step of the nucleophile on the aldehyde carbonyl is the rate-determining step (see: Ching, W.-M.; Kallen, R. G. J. Am. Chem. Soc. 1978, 100, 6119-6124). This seems to be the case in the catalysis by dipeptide 1 also, since electron-poor aldehydes are reported to react in shorter reaction times than their electron-rich counterparts (compare Figure 13).
-
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29
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84869276171
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The N⋯N-H distance of 2.99 A between the imidazole groups was frozen.
-
The N⋯N-H distance of 2.99 A between the imidazole groups was frozen.
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64349103114
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By catalytic distance we mean the distances highlighted with dotted lines in the transition states in Figure 9 and Figure 10 (excluding jr-interac-tion).
-
By "catalytic distance" we mean the distances highlighted with dotted lines in the transition states in Figure 9 and Figure 10 (excluding jr-interac-tion).
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