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The title amino acid esters (1a) (1c) and (1e) were prepared in high purity. The enthalpies of combustion ΔH 0c (1) of (1a-e) were measured using an isoperibolic calorimeter. The enthalpies of vaporization ΔH vap of (1b-e) were obtained from the temperature function of the vapour pressure measured in a flow system. The following enthalpies of formation have been obtained...
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