نتایج جستجو برای: nucleophilicity
تعداد نتایج: 348 فیلتر نتایج به سال:
The structure of the Asn102 mutant of trypsin was determined in order to distinguish whether the reduced activity of the mutant at neutral pH results from an altered active site conformation or from an inability to stabilize a positive charge on the active site histidine. The active site structure of the Asn102 mutant of trypsin is identical to the native enzyme with respect to the specificity ...
At 25.0 °C the specific rates of solvolysis for allyl and vinyl chloroformates have been determined in a wide mix of pure and aqueous organic mixtures. In all the solvents studied, vinyl chloroformate was found to react significantly faster than allyl chloroformate. Multiple correlation analyses of these rates are completed using the extended (two-term) Grunwald-Winstein equation with incorpora...
The nucleophilicity and Lewis basicity of DBU and DBN toward C(sp(2)) centers have been measured: nucleophilicities increase in the series DMAP < DBU < DBN < DABCO while Lewis basicities are DABCO < DMAP < DBU < DBN.
A recently introduced empirical nucleophilicity index for a series of nand p-nucleophiles was evaluated. The index is based on the frontier molecular orbital information of the nucleophile and its electrophilic partner. The model is validated against kinetic data of alkenes, phosphanes, phosphites and amines interacting with the corresponding electrophilic partner. The predictive character of t...
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