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• W2034237993 endingPage "591" @default.
• W2034237993 startingPage "584" @default.
• W2034237993 abstract "Abstract A comprehensive ab initio investigation has been performed on the structure and stability of the isomers of cycloserine and its protonated forms in the unsolvated state. Many conformers of cycloserine in the ketonic ( K ), enolic ( E 4 and E 2 ), and zwitterionic ( Z 7 and Z 2 ) forms have been characterized. Enols E 2 are only a few kilocalories per mole less stable than the K isomers. Enols E 4 , as well as Z 7 and Z 2 zwitterions, are several tens of kilocalories per mole less stable than K . All the above isomeric structures exhibit pronounced isoxazolidine ring puckering, which generates very rich conformeric landscapes. The relative stability of the conformers of K , E 2 , and E 4 responds essentially to a complex balance between the attractive and repulsive electrostatic interactions among their functional groups. The preferred site of protonation of cycloserine in the gas phase has been also investigated computationally and experimentally by IR multiphoton dissociation (IRMPD) spectroscopy. The most basic center of cycloserine is the N(7) nitrogen atom (proton affinity (PA)=215.3 kcal mol −1 ). Another important basic site is the O(6) oxygen atom (PA=213.0 kcal mol −1 ). Their most populated conformers have been identified by IRMPD spectroscopy. Their predominance responds to the electrostatic interactions among the functional groups of the protonated molecule." @default.
• W2034237993 created "2016-06-24" @default.
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• W2034237993 date "2014-02-24" @default.
• W2034237993 modified "2023-10-16" @default.
• W2034237993 title "Isomerism of Cycloserine and Its Protonated Form" @default.
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• W2034237993 doi "https://doi.org/10.1002/cplu.201400006" @default.
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