期刊
MOLECULES
卷 28, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/molecules28052152
关键词
phosphodiester hydrolysis; PMM method; molecular dynamics; rate constant calculation; statistical mechanics; quantum chemistry
In this study, the kinetics of hydroxide-promoted hydrolysis of phosphoric diesters were modeled using a hybrid quantum/classical approach. The results suggest that the hydrolysis occurs through a concerted A(N)D(N) mechanism, with no formation of penta-coordinated intermediates. This modeling method has the potential to predict rate constants and reactivities/selectivities in complex environments.
(1) Background: the theoretical modelling of reactions occurring in liquid phase is a research line of primary importance both in theoretical-computational chemistry and in the context of organic and biological chemistry. Here we present the modelling of the kinetics of the hydroxide-promoted hydrolysis of phosphoric diesters. (2) Method: the theoretical-computational procedure involves a hybrid quantum/classical approach based on the perturbed matrix method (PMM) in conjunction with molecular mechanics. (3) Results: the presented study reproduces the experimental data both in the rate constants and in the mechanistic aspects (C-O bond vs. O-P bond reactivity). The study suggests that the basic hydrolysis of phosphodiesters occurs through a concerted A(N)D(N) mechanism, with no formation of penta-coordinated species as reaction intermediates. (4) Conclusions: the presented approach, despite the approximations, is potentially applicable to a large number of bimolecular transformations in solution and therefore leads the way to a fast and general method to predict the rate constants and reactivities/selectivities in complex environments.
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