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Dalam [[kimia]], '''ester''' adalah suatu [[senyawa organik]] yang terbentuk melalui penggantian satu (atau lebih) atom [[hidrogen]] pada [[gugus fungsional|gugus]] [[hidroksil]] dengan suatu gugus organik (biasa dilambangkan dengan '''R''''). Asam oksigen adalah suatu asam yang [[molekul]]nya memiliki gugus [[hidroksida|-OH]] yang hidrogennya (H) dapat menjadi [[ion]] H+.
 
==Senyawa-senyawa ester ==
Banyak ester memiliki bau seperti bau buah-bauahn, sehingga banyak senyawanya dijadikan perasa dan aroma buatan.
 
{| class="wikitable"
|-
! valign="top" align="left"| Nama ester
! valign="top" | Struktur
! valign="top" align="left" | Bau atau terdapat di
|-
| [[Alil heksanoat]]
| [[Image:Prop-2-enyl hexanoate.png|75px]]
| [[nanas]]
|-
| [[Benzil asetat]]
| [[Image:Benzyl acetate-structure.svg|75px]]
| [[pir]], [[stroberi]], [[melati]]
|-
| [[Bornil asetat]]
| [[Image:Bornylacetate.svg|50px]]
| [[pine]]
|-
| [[Butil butirat]]
| [[Image:Butyl butyrate.png|75px]]
|| [[nanas]]
|-
| [[Etil asetat]]
| [[Image:Ethyl-acetate-2D-skeletal.png|75px]]
| [[penghilang cat kuku]], cat pada mainan, [[lem]]
|-
| [[Etil butirat]]
| [[Image:Ethyl butyrate.png|75px]]
| [[pisang]], [[nanas]], [[stroberi]]
|-
| [[Etil heksanoat]]
| [[Image:Ethyl hexanoate.png|75px]]
| [[nanas]]
|-
| [[Etil sinamat]]
| [[Image:Ethyl cinnamate.png|75px]]
| [[kulit manis]]
|-
| [[Etil format]]
| [[Image:Ethyl methanoate.png|75px]]
| [[lemon]], [[rum]], [[stroberi]]
|-
| [[Etil heptanoat]]
| [[Image:Ethyl heptanoate.png|75px]]
| [[aprikot]], [[ceri]], [[anggur]], [[raspberi]]
|-
| [[Etil isovalerat]]
| [[Image:Ethyl isovalerate.png|75px]]
| [[apel]]
|-
| [[Etil laktat]]
| [[Image:Ethyl lactate.png|75px]]
| [[mentega]], [[krim]]
|-
| [[Etil nonanoat]]
| [[Image:Ethyl nonanoate.png|75px]]
| [[anggur]]
|-
| [[Ethyl pentanoate]]
| [[Image:Ethyl valerate.png|75px]]
| [[apple]]
|-
| [[Geranyl acetate]]
| [[Image:Geranyl acetate.png|75px]]
| [[Pelargonium|geranium]]
|-
| [[Geranyl butyrate]]
| [[Image:Geranyl butyrate.png|75px]]
| [[cherry]]
|-
| [[Geranyl pentanoate]]
| [[Image:Geranyl pentanoate.svg|75px]]
| [[apple]]
|-
| [[Isobutyl acetate]]
| [[Image:Isobutyl acetate.png|75px]]
| [[cherry]], [[raspberry]], [[strawberry]]
|-
| [[Isobutyl formate]]
| [[Image:Isobutyl formate.svg|75px]]
| [[raspberry]]
|-
| [[Isoamyl acetate]]
| [[Image:Isoamyl acetate.png|75px]]
| [[pear]], [[banana]] (flavoring in [[Pear drop]]s)
|-
| [[Isopropyl acetate]]
| [[Image:Isopropyl acetate.png|75px]]
| fruity
|-
| [[Linalyl acetate]]
| [[Image:Linalyl acetate.png|75px]]
| [[lavender]], [[Common sage|sage]]
|-
| [[Linalyl butyrate]]
| [[Image:Linalyl butyrate.png|75px]]
| [[peach]]
|-
| [[Linalyl formate]]
| [[Image:Linalyl formate.png|75px]]
| [[apple]], [[peach]]
|-
| [[Methyl acetate]]
| [[Image:Methyl acetate.png|75px]]
| [[glue]]
|-
| [[Methyl anthranilate]]
| [[Image:Methyl anthranilate.png|75px]]
| [[grape]], [[jasmine]]
|-
| [[Methyl benzoate]]
| [[Image:Methyl benzoate.png|75px]]
| fruity, [[ylang ylang]], [[feijoa]]
|-
| [[Methyl butyrate]] (methyl butanoate)
|<!-- Deleted image removed: [[Image:Methyl butyrate.png|75px]] -->
| [[pineapple]], [[apple]], [[strawberry]]
|-
| [[Methyl cinnamate]]
| [[Image:methyl cinnamate.png|75px]]
| [[strawberry]]
|-
| [[Methyl pentanoate]] (methyl valerate)
| [[Image:Methyl pentanoate.png|75px]]
| [[flower]]y
|-
| [[Methyl phenylacetate]]
| [[Image:Methyl phenylacetate.png|75px]]
| [[honey]]
|-
| [[Methyl salicylate]] ([[oil of wintergreen]])
| [[Image:Salicylic acid methyl ester chemical structure.png|75px]]
| Modern [[root beer]], [[wintergreen]], [[Germolene]] and [[Ralgex]] ointments (UK)
|-
| [[Nonyl caprylate]]
| [[Image:Nonyl caprylate.png|75px]]
| [[orange (fruit)|orange]]
|-
| [[Octyl acetate]]
| [[Image:Ocyl acetate.png|75px]]
| fruity-[[orange (fruit)|orange]]
|-
| [[Octyl butyrate]]
| [[Image:Octyl butyrate.png|75px]]
| [[parsnip]]
|-
| [[Amyl acetate]] (pentyl acetate)
| [[Image:Amyl acetate.png|75px]]
| [[apple]], [[banana]]
|-
| [[Pentyl butyrate]] (amyl butyrate)
| [[Image:Pentyl butyrate.png|75px]]
| [[apricot]], [[pear]], [[pineapple]]
|-
| [[Pentyl hexanoate]] (amyl caproate)
| [[Image:Pentyl hexanoate.png|75px]]
| [[apple]], [[pineapple]]
|-
| [[Pentyl pentanoate]] (amyl valerate)
| [[Image:Pentyl pentanoate.png|75px]]
| [[apple]]
|-
| [[Propyl acetate]]
| [[Image:Propylethanoate.svg|75px]]
| [[pear]]
|-
| [[Propyl hexanoate]]
| [[Image:Propyl hexanoate.svg|75px]]
| [[blackberry]], [[pineapple]], [[cheese]], [[wine]]
|-
| [[Propyl isobutyrate]]
| [[Image:Propylisobutyrate.svg|75px]]
| [[rum]]
|-
| [[Terpenyl butyrate]]
| [[Image:Terpenyl butyrate.png|75px]]
| | [[cherry]]
|}
 
== Pranala luar ==