A mechanistic study of thioester hydrolysis with heavy atom kinetic isotope effects. 2015

John F Marlier, and Emily J Fogle, and Richard L Redman, and Anthony D Stillman, and Matthew A Denison, and Lori I Robins
University of Washington-Bothell , Bothell, Washington 98011, United States.

The carbonyl-C, carbonyl-O, and leaving-S kinetic isotope effects (KIEs) were determined for the hydrolysis of formylthiocholine. Under acidic conditions, (13)k(obs) = 1.0312, (18)k(obs) = 0.997, and (34)k(obs) = 0.995; for neutral conditions, (13)k(obs) = 1.022, (18)k(obs) = 1.010, and (34)k(obs) = 0.996; and for alkaline conditions, (13)k(obs) = 1.0263, (18)k(obs) = 0.992, and (34)k(obs) = 1.000. The observed KIEs provided helpful insights into a qualitative description of the bond orders in the transition state structure.

UI MeSH Term Description Entries
D007554 Isotopes Atomic species differing in mass number but having the same atomic number. (Grant & Hackh's Chemical Dictionary, 5th ed) Isotope
D007700 Kinetics The rate dynamics in chemical or physical systems.
D006868 Hydrolysis The process of cleaving a chemical compound by the addition of a molecule of water.
D013457 Sulfur Compounds Inorganic or organic compounds that contain sulfur as an integral part of the molecule. Sulfur Compound,Compound, Sulfur,Compounds, Sulfur
D013860 Thiocholine A mercaptocholine used as a reagent for the determination of CHOLINESTERASES. It also serves as a highly selective nerve stain.
D015394 Molecular Structure The location of the atoms, groups or ions relative to one another in a molecule, as well as the number, type and location of covalent bonds. Structure, Molecular,Molecular Structures,Structures, Molecular

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