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==Fisik==
EstersÉster can participate in [[hydrogen bond]]s 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 [[hydrocarbon]]s. 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 [[molecule]]s cannot hydrogen bond to each other, which makes esters generally more volatile than an [[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]].
Éster loba nu mibanda bau nu béda-béda, sahingga kiwari dipaké sangkan ngahasilkeun bau artifisial. Misalna,
Many esters have distinctive odors, which has led to their widespread use as artificial flavorings and fragrances. For example:
:[[methylmétil butanoatebutanoat]] smellsbauna ofkawas [[pineappleganas]] oratawa [[appleapel]]
:[[methylmétil salicylatesalisilat]] (oil of [[wintergreen]]) smells of the ointments called Germolene™ and Ralgex™ in the UK
:[[methylmétil benzoatebénzoat]] smellsbauna ofkawas [[marzipan]]
:[[ethylétil butanoatebutanoat]] smellsbauna ofkawas [[pineappleganas]]
:[[ethylétil methanoatemétanoat]] smellsbauna ofkawas ''[[raspberry]]'' oratawa [[rum]]
:[[ethylétil butanoatebutanoat]] smellsbauna ofkawas [[pineappleganas]] oratawa [[apricotaprikot]] oratawa [[strawberrystrobéri]]
:[[ethylétil salicylatesalisilat]] smellsbauna ofkawas ''[[mint]]''
:[[ethylétil heptanoatehéptanoat]] smellsbauna ofkawas ''[[grape]]''
:[[butylbutil ethanoateétanoat]] smellsbauna ofkawas ''[[raspberry]]''
:[[pentylpentil ethanoateétanoat]] smellsbauna ofkawas [[bananacau]]
:[[pentylpentil pentanoatepentanoat]] smellsbauna ofkawas [[appleapel]]
:[[pentylpentil butanoatebutanoat]] smellsbauna ofkawas [[pearpir]] oratawa [[apricotaprikot]]
:[[octyloktil ethanoateétanoat]] smellsbauna ofkawas [[orange (fruit)|orangejeruk]]
:[[benzylbénzil ethanoateétanoat]] smellsbauna ofkawas [[jasminemalati]]
Éster bisa ngalaman [[hidrolisis]] - pegatna éster ku ayana cai - mun dikatalisan boh ku asam atawa basa, ngahasilkeun alkohol jeung asam karboksilat atawa uyah karboksilatna. Prosés nu dikatalisan basa disebut [[panyabunan]] (sabunifikasi).
Esters may undergo [[hydrolysis]] - the breakdown of an ester by water. This process can be catalyzed both by acids and bases. The base-catalyzed process is called [[saponification]]. The hydrolysis yields an alcohol and a carboxylic acid or its [[carboxylate]] [[salt]].
[[Image:Ester_hydrolysis.PNG|center|frame| EsterSabunifikasi saponificationéster ( basichidrolisis hydrolysisdasar)]] ▼
▲[[Image:Ester_hydrolysis.PNG|center|frame|Ester saponification (basic hydrolysis)]]
== Baca ogé ==
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