Proton affinities and ion enthalpies was written by Holmes, John L.;van Huizen, Nick A.;Burgers, Peter C.. And the article was included in European Journal of Mass Spectrometry in 2017.SDS of cas: 106-73-0 The following contents are mentioned in the article:
Proton affinities of a number of alkyl acetates (CH3-C(=O)-OR) and of Me alkanoates (R-C(=O)-OCH3, R=H, alkyl) have been assembled from the literature or measured using the kinetic method. It was observed that the proton affinities for the isomeric species CH3-C(=O)-OR and R-C(=O)-OCH3 are almost identical, an unexpected result as the charge in these protonated ester mols. is largely at the keto carbon atom and so this site should be more sensitive to alkyl substitution. Anal. of the data, including those from lone pair ionisation and core-electron ionisation experiments available from the literature, indicate that after protonation, extensive charge relaxation (or polarisation) takes place (as is also the case, according to the literature, after core-electron ionisation). By contrast, after lone pair ionisation, which results in radical cations, such relaxation processes are relatively less extensive. As a consequence, changes in ion enthalpies of these protonated mols. follow more closely the changes in neutral enthalpies, compared with changes in enthalpies of the corresponding radical cations, formed by electron detachment. Preliminary analyses of published energetic data indicate that the above finding for organic esters may well be another example of a more general phenomenon. This study involved multiple reactions and reactants, such as Methyl heptanoate (cas: 106-73-0SDS of cas: 106-73-0).
Methyl heptanoate (cas: 106-73-0) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.SDS of cas: 106-73-0
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics