* [[cis-2-Decenoic acid|''cis''-2-decenoic acid]] or (2''Z'')-dec-2-enoic acid. (CAS 15790-91-7, Nikkaji J1.577.978K) Produced by ''[[Pseudomonas aeruginosa]]'', inhibits biofilm formation.<ref name=davi2009/>

* [[trans-2-Decenoic acid|''trans''-2-decenoic acid]] or (2''E'')-dec-2-enoic acid. Flavoring agent (CAS 334-49-6, Nikkaji J98.042K, [[FEMA]] 3913, [[JECFA]] 1372, FDA 332T8TH7B1);<ref name=jecfa.1372/> Density: 0.92-0.93 25 °C. Refractive Index: ~1.46 at  20.00 °C.  MP: 12 °C BP: 161-162 °C. at 15.00 torr, 278-279 °C. at 1 atm.  Odor described as "fresh, fruity (peach), slightly oily and waxy". <ref name=perf.1042171/> Stimulates nerve cell regeneration.<ref name=hira2010/> and biofilm desintegration.<ref name=caip2013/>. Excreted by the [[caries]] bacterium ''[[Streptococcus mutans]]'' and inhibits growth of the fungus ''[[Candida albicans]]''.<ref name=vilc2010/>

** [[ethyl trans-2-decenoate]] (CAS 7367-88-6, Pubchem 5463904, 6047581, Nikkaji J212.367C, J1.075.382A, FDA B2K05S6L5Q, JECFA 1814, FEMA 3641) Flavoring agent. BP: ~134 °C. at 20.00 torr, 140 °C. at 30.00 torr. Odor described as "green, fruity (apple, pear), waxy."<ref name=mosc1995/> "peely citrus". <ref name=perf.1029361/>

* [[cis-3-Decenoic acid|''cis''-3-decenoic acid]] or (3''Z'')-dec-3-enoic acid. (CAS 2430-93-5, Nikkaji J3.028G) The female sex [[pheromone]] of the furniture carpet beetle ''[[Anthrenus flavipes]]''.<ref name=mami1980/> Odor deascribed as "fatty". <ref name=perf.1127551/>

* [[trans-3-decenoic acid]] (CAS 53678-20-9, Beilstein 1722688, Pubchem 5282725, Nikkaji J98.043I) Occurs in some natural extracts.  <ref name=perf.1123451/>

* [[cis-4-Decenoic acid|''cis''-4-decenoic acid]] or (4''Z'')-dec-4-enoic acid. (CAS 505-90-8, Pubchem 5312351, Nikkaji J79.643C, FDA 6PR4L1KTAZ) A metabolite found in human [[plasma]] in certain [[pathology|pathologies]].<ref name=duran1988/>  Odor described as "fatty, green". <ref name=perf.1546481/>

** [[ethyl cis-4-decenoate]] (CAS 7367-84-2, Pubchem 5463488, Nikkaji J212.366E) Flavoring agent. Density: 0.883 at 20 °C. Refractive Index: 1.438 at 20 °C.  BP: 128 °C. at 30 torr, 236-237 °C. at 1 atm. <ref name=perf.1053051/>

* [[trans-4-Decenoic acid|''trans''-4-decenoic acid]] or (4''E'')-dec-4-enoic acid. (CAS 57602-94-5, Pubchem 5282726, Nikkaji J98.044G, FDA S0TXC5QGPU) Result of reacting [[1‐octene]] and [[manganese(III) acetate]].<ref name=klein1975/>

** [[ethyl trans-4-decenoate]] (CAS 76649-16-6, Pubchem 5362583, Nikkaji J208.443K, FDA 3I89X5937N, JECFA 341, FEMA 3642) Density: ~0.876 at 25.00 °C. Refractive Index: ~1.437 at 20.00 °C. BP: 72.00 °C. at 0.10 torr. Odor described as "green, fruity (pineapple, apple), waxy, cognac".<ref name=mosc1995/> <ref name=perf.1004361/>

* [[cis-5-decenoic acid]] (CAS 84168-28-5, Pubchem 15101542, Nikkaji J2.261.052J, FDA 5R82Y8PAHS)  Odor described as "fatty, green". <ref name=perf.1130101/>

* [[trans-5-decenoic acid]] (CAS 16424-55-8, Nikkaji J2.261.051A, Pubchem 5362593, FDA P9YWE0K08Y)   Odor described as "milky, fatty". <ref name=perf.1127541/>

* [[trans-6-decenoic acid]] and [[5-decenoic acid]] mixture (CAS 85392-04-7, Pubchem 5362594, FDA OEE88158Q0) BP: 270-272 °C. at 1 atm.  Odor described as "milky, buttery, dairy". <ref name=perf.1594471/>


* [[caproleic acid]], 9-decenoic acid, or dec-9-enoic acid. (CAS 14436-32-9, PUBchem 61743, FEMA 3660, Nikkaji J81.770H, FDA U2E27P3TGK) Small amounts in [[goat milk|goat]] and [[milk fat|cow milk]],<ref name=keen1955/><ref name=bocc2020/><ref name=bouz2013/> and oils of ''[[Sapium sebiferum]]''<ref name=zhou2020/> and ''[[Litsea cubeba]]''.<ref name=zhua2018/> Traces also in beer, wine, clams, Parmesan cheese and snails.<ref name=perf.1018301/>  Broad-spectrum antimicrobial.<ref name=desb2012/> Flavoring agent (FEMA 3660, JECFA 328).<ref name=JECFA.328/> Density: ~0.9 at 20.00 °C. BP: ~270 °C at 1 atm, 130-135 °C at 1-3 [[torr]], 95 °C at 0.1 torr. Refractive index n<sub>D</sub><sup>20</sup>: 1.4488.<ref name=perf.1018301/><ref name=keen1955/> Irritating to skin.<ref name=perf.1018301/> Used as flavouring agent. Odor described as milky,waxy,green,fatty,soapy,creamy,cheesy".<ref name=mosc1993/> 

** [[ethyl caproleate]], 9-decenoic acid ethyl ester (CAS 67233-91-4, Pubchem 522255, Nikkaji J976.137C, FDA OI02K838CN) used as flavoring agent. Odor described as "fruity".  Density: ~0.878 at 25.00 °C.  Refractive Index: ~1.44 at  20.00 °C.  BP: 249-250 °C. at 1 atm. <ref name=perf.1582591/>


######################################################################

** butyl 2-decenoate, isomer unspecified (CAS 7492-45-7, Pubchem 5463906, Nikkaji J421.861B, FDA 38KP1S005I, JECFA 1348, FEMA 2194), is a flavoring agent with odor described as "fruity (peach, apricot), green, fatty, coconut, walnut". Density: 0.87-0.88 at  25.00 °C. Refractive Index: ~1.45 at 20.00 °C. BP:  290-291 °C. at 1 atm. Flavouring agent. <ref name=perf.1013301/>

** [[methyl 2-decenoate]], isomer unspecified (CAS 2482-39-5, Pubchem 5368064, Nikkaji J110.937E, FDA 7YEW204WFW), is used as flavouring ingredient, with odor described as "mushroom". <ref name=perf.1475231/>

* 4-decenoic acid, unspecified isomer (CAS 26303-90-2, Nikkaji J39.562E, FDA S0TXC5QGPU, JECFA 1287, FEMA 3914), is said to occur in hops and beer. It is a flavoring agent, with odor described as "fruity". Density: ~0.92 at 20.00 °C. Refractive Index: ~1.15 at 20.00 °C. BP:  97.00 to 98.00 °C. at 0.30 torr.<ref name=perf.1100911/>.  It is listed as "no concern" food additive (FEMA 3914, JECFA 1287) by the [[Joint FAO/WHO Expert Committee on Food Additives|FAO/WHO JECFA]].<ref name=jecfa.1287/>

* A mixture of 5-decenoic and 6-decenoic acids (JECFA 327, FDA 8H370297TA), with the trade name "milk lactone", is allowed in the US as [[Generally Recognized as Safe]] (GRAS) [[flavoring]]s, such as in imitation dairy products with common name "milk lactone"  for their milk-like aroma.<ref name=fema1985/> <ref name=perf.1037801/> 

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

* [[methyl 5-oxo decenoate]], unspecified isomer (CAS 72361-36-5, Pubchem 6441354). <ref name=perf.1475241/>

* [[10-hydroxy-trans-2-decenoic acid]] (CAS 14113-05-4, Pubchem 5312738, Nikkaji J838.856C, FDA 76B519G7TJ) "Queen bee acid", found in royal jelly. Characteristic odor. <ref name=perf.1667611/>