Propionate or propanoate

Esters participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols.  This ability to participate in hydrogen bonding makes them more water-soluble than their parent hydrocarbons.   However, the limitations on their hydrogen bonding also make them more hydrophobic than either their parent alcohols or parent acids.  Their lack of hydrogen-bond-donating ability means that ester molecules cannot hydrogen-bond to each other, which makes esters generally more volatile than a carboxylic acid of similar molecular weight.  This property makes them very useful in organic analytical chemistry: unknown organic acids with low volatility can often be esterified into a volatile ester, which can then be analysed using gas chromatography, gas liquid chromatography, or mass spectrometry.  Many esters have distinctive odors, which has led to their use as artificial flavorings and fragrances. For example:

Propionate or propanoate

propionate or propanoate

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