2-hexenal
hexylenic aldehyde

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  08-26001 2-HEXENAL

Name: hex-2-enal CAS Number: 505-57-7 3D/inchi ECHA EINECS - REACH Pre-Reg: 208-014-0 FDA UNII: Search Beilstein Number: 1740988 MDL: MFCD00007008 CoE Number: 748 XlogP3-AA: 1.50 (est) Molecular Weight: 98.14490000 Formula: C6 H10 O BioActivity Summary: listing NMR Predictor: Predict (works with chrome, Edge or firefox) Also(can) Contains: (E)-2-hexenal   (Z)-2-hexenal   2-hexenoic acid EFSA/JECFA Comments: At least 92%; secondary component 3-4% 2-hexenoic acid. (EFSA) Category:flavoring agents   US / EU / FDA / JECFA / FEMA / FLAVIS / Scholar / Patent Information: Google Scholar: Search Google Books: Search Google Scholar: with word "volatile" Search Google Scholar: with word "flavor" Search Google Scholar: with word "odor" Search Perfumer and Flavorist: Search Google Patents: Search US Patents: Search EU Patents: Search Pubchem Patents: Search PubMed: Search NCBI: Search DG SANTE Food Flavourings: 05.189 2-hexenal FEMA Number: 2560 2-hexenal FDA: No longer provide for the use of these seven synthetic flavoring substances FDA Mainterm (SATF): 505-57-7 ; 2-HEXENAL FDA Regulation: FDA PART 172 -- FOOD ADDITIVES PERMITTED FOR DIRECT ADDITION TO FOOD FOR HUMAN CONSUMPTION Subpart F--Flavoring Agents and Related Substances Sec. 172.515 Synthetic flavoring substances and adjuvants.   Physical Properties: Appearance: colorless to pale yellow clear liquid (est) Assay: 92.00 to 100.00 sum of isomers Food Chemicals Codex Listed: No Specific Gravity: 0.83800 to 0.84800 @ 25.00 °C. Pounds per Gallon - (est).: 6.973 to 7.056 Refractive Index: 1.43600 to 1.44600 @ 20.00 °C. Boiling Point: 47.00 °C. @ 17.00 mm Hg Boiling Point: 146.00 to 147.00 °C. @ 760.00 mm Hg Vapor Pressure: 4.624000 mmHg @ 25.00 °C. (est) Vapor Density: 3.4 ( Air = 1 ) Flash Point: 101.00 °F. TCC ( 38.33 °C. ) logP (o/w): 1.790 (est) Soluble in:   alcohol   water, 5261 mg/L @ 25 °C (est) Insoluble in:   water   Organoleptic Properties: Odor Type: green sweet almond bitter almond fruity green leafy apple plum vegetable Odor Description:at 100.00 %. sweet almond fruity green leafy apple plum vegetable Odor and/or flavor descriptions from others (if found).   Cosmetic Information: None found   Suppliers: Parchem 2-hexenal Penta International 2-HEXENAL Chemical Sources Association Need This Item for Flavor/Food?: You can contact the Chemical Sources Association   Safety Information:   Hazards identification   Classification of the substance or mixture GHS Classification in accordance with 29 CFR 1910 (OSHA HCS) None found. GHS Label elements, including precautionary statements   Pictogram   Hazard statement(s) None found. Precautionary statement(s) None found. Oral/Parenteral Toxicity: intraperitoneal-mouse LD50 290 mg/kg Personal Communication from H. Zollner, Institut fur Biochemie, Der Universitat, Gras, Oct. 23, 1975Vol. 23OCT1975 Dermal Toxicity: Not determined Inhalation Toxicity: Not determined   Safety in Use Information: Category: flavoring agents Recommendation for 2-hexenal usage levels up to:   not for fragrance use.   Maximised Survey-derived Daily Intakes (MSDI-EU): 1.22 (μg/capita/day) Maximised Survey-derived Daily Intakes (MSDI-USA): 409.00 (μg/capita/day) Modified Theoretical Added Maximum Daily Intake (mTAMDI): 2000 (μg/person/day) Threshold of Concern: 1800 (μg/person/day) Structure Class: I Use levels for FEMA GRAS flavoring substances on which the FEMA Expert Panel based its judgments that the substances are generally recognized as safe (GRAS). The Expert Panel also publishes separate extensive reviews of scientific information on all FEMA GRAS flavoring substances and can be found at FEMA Flavor Ingredient Library publication number: 3 Click here to view publication 3   average usual ppm average maximum ppm baked goods: - 16.00000 beverages(nonalcoholic): - 3.10000 beverages(alcoholic): - - breakfast cereal: - - cheese: - - chewing gum: - - condiments / relishes: - - confectionery froastings: - - egg products: - - fats / oils: - - fish products: - - frozen dairy: - 0.70000 fruit ices: - 0.70000 gelatins / puddings: - - granulated sugar: - - gravies: - - hard candy: - 15.00000 imitation dairy: - - instant coffee / tea: - - jams / jellies: - - meat products: - - milk products: - - nut products: - - other grains: - - poultry: - - processed fruits: - - processed vegetables: - - reconstituted vegetables: - - seasonings / flavors: - - snack foods: - - soft candy: - - soups: - - sugar substitutes: - - sweet sauces: - -   Food categories according to Commission Regulation EC No. 1565/2000 (EC, 2000) in FGE.06 (EFSA, 2002a). According to the Industry the "normal" use is defined as the average of reported usages and "maximum use" is defined as the 95th percentile of reported usages (EFSA, 2002i). Note: mg/kg = 0.001/1000 = 0.000001 = 1/1000000 = ppm.   average usage mg/kg maximum usage mg/kg Dairy products, excluding products of category 02.0 (01.0): 5.70000 12.00000 Fats and oils, and fat emulsions (type water-in-oil) (02.0): 1.50000 14.25000 Edible ices, including sherbet and sorbet (03.0): 0.90000 2.98000 Processed fruit (04.1): - - Processed vegetables (incl. mushrooms & fungi, roots & tubers, pulses and legumes), and nuts & seeds (04.2): 5.00000 5.03000 Confectionery (05.0): 5.50000 14.46000 Chewing gum (05.3): - - Cereals and cereal products, incl. flours & starches from roots & tubers, pulses & legumes, excluding bakery (06.0): 4.80000 11.55000 Bakery wares (07.0): 8.00000 19.07000 Meat and meat products, including poultry and game (08.0): 0.90000 2.98000 Fish and fish products, including molluscs, crustaceans and echinoderms (MCE) (09.0): 0.90000 2.98000 Eggs and egg products (10.0): 0.90000 2.98000 Sweeteners, including honey (11.0): 0.90000 2.98000 Salts, spices, soups, sauces, salads, protein products, etc. (12.0): 2.00000 5.00000 Foodstuffs intended for particular nutritional uses (13.0): - - Non-alcoholic ("soft") beverages, excl. dairy products (14.1): 2.00000 4.43000 Alcoholic beverages, incl. alcohol-free and low-alcoholic counterparts (14.2): 1.00000 2.00000 Ready-to-eat savouries (15.0): 2.50000 4.50000 Composite foods (e.g. casseroles, meat pies, mincemeat) - foods that could not be placed in categories 01.0 - 15.0 (16.0): 0.90000 2.98000   Safety References: European Food Safety Athority(EFSA):Flavor usage levels; Subacute, Subchronic, Chronic and Carcinogenicity Studies; Developmental / Reproductive Toxicity Studies; Genotoxicity Studies... European Food Safety Authority (EFSA) reference(s): EFSA Panel on Food Contact Materials, Enzymes, Flavourings and Processing Aids (CEF) View page or View pdf Scientific Opinion on Flavouring Group Evaluation 200, Revision 1 (FGE.200 Rev.1): 74 a,ß-unsaturated aliphatic aldehydes and precursors from chemical subgroup 1.1.1 of FGE.19 View page or View pdf Scientific Opinion on Flavouring Group Evaluation 5, Revision 3 (FGE.05Rev3): Branched- and straight-chain unsaturated aldehydes, dienals, unsaturated and saturated carboxylic acids and related esters with saturated and unsaturated aliphatic alcohols and a phenylacetic acid related ester from chemical groups 1, 2, 3, 5 and 15 View page or View pdf EPI System: View Chemical Carcinogenesis Research Information System:Search AIDS Citations:Search Cancer Citations:Search Toxicology Citations:Search EPA Substance Registry Services (TSCA):505-57-7 EPA ACToR:Toxicology Data EPA Substance Registry Services (SRS):Registry Laboratory Chemical Safety Summary :10460 National Institute of Allergy and Infectious Diseases:Data hex-2-enal Chemidplus:0000505577 RTECS:MP5900000 for cas# 505-57-7   References:   hex-2-enal NIST Chemistry WebBook: Search Inchi Canada Domestic Sub. List: 505-57-7 Pubchem (cid): 10460 Pubchem (sid): 134976298 Flavornet: 505-57-7 Pherobase: View   Other Information: (IUPAC): Atomic Weights of the Elements 2011 (pdf) Videos: The Periodic Table of Videos tgsc: Atomic Weights use for this web site (IUPAC): Periodic Table of the Elements FDA Substances Added to Food (formerly EAFUS): View Metabolomics Database: Search HMDB (The Human Metabolome Database): HMDB31496 FooDB: FDB008081 YMDB (Yeast Metabolome Database): YMDB01655 Typical G.C. VCF-Online: VCF Volatile Compounds in Food ChemSpider: View Wikipedia: View   Potential Blenders and core components note For Odor acidic iso butyric acid FL/FR cyclohexyl acetic acid FL/FR 2- methyl butyric acid FL/FR animal methyl (E)-2-octenoate FL/FR balsamic iso amyl benzoate FL/FR buttery acetyl propionyl FL/FR butyl butyryl lactate FL/FR 2,3- heptane dione FL/FR cheesy butyric acid FL/FR 2- methyl hexanoic acid FL/FR S-( methyl thio) butyrate FL/FR 2- methyl valeric acid FL/FR citrus 4- decenal FL/FR 2- heptanol FL/FR tetrahydrocitral FL/FR dairy methyl butyl phenyl acetate FL/FR ethereal cyclohexyl formate FL/FR fatty 3- decen-2-one FL/FR hexanoic acid FL/FR methyl (E)-2-hexenoate FL/FR methyl 2-hexenoate FL/FR floral boronia absolute FL/FR citronellyl valerate FL/FR dihydrocarvyl acetate FL/FR (±)-2,3- dihydrofarnesol FL/FR (E)- geranyl acetone FL/FR geranyl formate FL/FR geranyl isobutyrate FL/FR hexyl lactate FL/FR hexyl nonanoate FL/FR (Z)- jasmone FL/FR para- methyl benzyl acetate FL/FR papaya isobutyrate FL/FR phenethyl hexanoate FL/FR fruity allyl butyrate FL/FR iso amyl butyrate FL/FR iso amyl isobutyrate FL/FR iso amyl valerate FL/FR apple ketal FL/FR artemisia pallens herb oil FL/FR iso butyl octanoate FL/FR iso butyl propionate FL/FR cherry pentenoate FL/FR cinnamyl hexanoate FL/FR cyclohexyl carboxylic acid FL/FR cyclohexyl propionate FL/FR 2- cyclopentyl cyclopentanone FL/FR davana oil CO2 extract FL/FR diethyl malonate FL/FR dimethyl succinate FL/FR ethyl (E)-3-hexenoate FL/FR ethyl 2-hexenoate FL/FR ethyl 2-octenoate FL/FR ethyl acetoacetate FL/FR ethyl bicyclo(2.2.1)-5-heptene-2-carboxylate FL/FR ethyl hexanoate FL/FR ethyl levulinate FL/FR ethyl methyl-para-tolyl glycidate FL/FR (E,E)- ethyl sorbate FL/FR filbert hexenone FL/FR geranyl ethyl ether FL/FR geranyl isovalerate FL/FR 4- heptanone FL/FR 2- heptyl butyrate FL/FR heptyl isobutyrate FL/FR (E)-2- hexen-1-ol FL/FR 2- hexen-1-ol FL/FR (E)-3- hexen-1-yl acetate FL/FR (Z)-3- hexen-1-yl anthranilate FL/FR (Z)-3- hexen-1-yl isobutyrate FL/FR hexyl (E)-tiglate FL/FR hexyl acetate FL/FR hexyl isovalerate FL/FR hexyl propionate FL/FR hexyl valerate FL/FR methyl 2-methyl butyrate FL/FR methyl 4-methyl valerate FL/FR 2- methyl butyl isovalerate FL/FR methyl heptanoate FL/FR methyl octadienoate FL/FR methyl valerate FL/FR 3- methyl-2-butenal FL/FR octen-1-yl cyclopentanone FL/FR octyl butyrate FL/FR 2- pentyl furan FL/FR 3- phenyl propyl hexanoate FL/FR 4- phenyl-2-butyl acetate FL/FR pineapple pentenoate FL/FR prenyl hexanoate FL/FR (E,E)- sorbyl butyrate FL/FR sorbyl butyrate FL/FR tetrahydrofurfuryl butyrate FL/FR tropical thiazole FL/FR tropical trithiane FL/FR green acetaldehyde benzyl 2-methoxyethyl acetal FL/FR acetaldehyde ethyl phenethyl acetal FL/FR actinidia chinensis fruit extract FL/FR benzaldehyde dimethyl acetal FL/FR cilantro leaf oil FL/FR cumin acetaldehyde FL/FR black currant bud absolute replacer FL/FR iso cyclocitral (IFF) FL/FR alpha- decalactone FL/FR ethyl (E)-2-decenoate FL/FR ethyl (E)-2-hexenoate FL/FR ethyl (E)-4-decenoate FL/FR galbanum oil terpeneless FL/FR galbanum oleoresin FL/FR green note propionate FL/FR (Z)-3- hepten-1-yl acetate FL/FR hexanal (aldehyde C-6) FL/FR hexanal dimethyl acetal FL/FR (Z)-2- hexen-1-ol FL/FR (Z)-3- hexen-1-yl (E)-2-hexenoate FL/FR (Z)-3- hexen-1-yl 2-methyl butyrate FL/FR (Z)-3- hexen-1-yl acetate FL/FR (E)-2- hexen-1-yl acetate FL/FR (Z)-3- hexen-1-yl hexanoate FL/FR (Z)-3- hexen-1-yl isovalerate FL/FR (E)-2- hexen-1-yl propionate FL/FR (Z)-3- hexen-1-yl valerate FL/FR (E)-2- hexen-1-yl valerate FL/FR 3- hexenal FL/FR (E)-2- hexenal FL/FR (E)-2- hexenal propylene glycol acetal FL/FR 3- hexenyl acetate FL/FR hexyl heptanoate FL/FR hexyl isobutyrate FL/FR hexyl octanoate FL/FR manzanate (Givaudan) FL/FR methyl (E)-3-hexenoate FL/FR (E)-2- octen-1-yl acetate FL/FR 2- pentenal FL/FR (E)-2- pentenal FL/FR propylene acetal FL/FR sorbyl isobutyrate FL/FR (E,E)- sorbyl isobutyrate FL/FR thiogeraniol FL/FR herbal iso amyl heptanoate FL/FR (1S,5R)- myrtenyl acetate FL/FR 2- pentyl acetate FL/FR tagete oil india FL/FR viridiflorol FL/FR minty carvyl acetate FL/FR nutty nutty quinoxaline FL/FR spicy cinnamyl propionate FL/FR sulfurous 4- methyl 4-mercaptopentan-2-one 1% solution FL/FR waxy (E)- methyl geranate FL/FR 2- methyl heptanoic acid FL/FR nonanoic acid FL/FR 2- nonanol FL/FR octanol FL/FR octyl 2-methyl butyrate FL/FR octyl isobutyrate FL/FR undecanoic acid FL/FR winey methyl 3-acetoxyoctanoate FL/FR For Flavor No flavor group found for these acetaldehyde benzyl 2-methoxyethyl acetal FL/FR actinidia chinensis fruit juice FL allyl levulinate FL allyl tiglate FL iso butyl octanoate FL/FR cinnamyl hexanoate FL/FR citronellyl valerate FL/FR 2- cyclopentyl cyclopentanone FL/FR alpha- decalactone FL/FR 9- decen-2-one FL 4- decenal FL/FR 2,5- diethyl-4-propyl thiazole FL ethyl 2-(methyl thio) acetate FL ethyl 2-hexenoate FL/FR ethyl bicyclo(2.2.1)-5-heptene-2-carboxylate FL/FR ethyl cyclohexyl carboxylate FL geranyl ethyl ether FL/FR (E,E)-2,4- heptadien-1-ol FL (Z)-3- hepten-1-yl acetate FL/FR 2- heptyl butyrate FL/FR hexanal dimethyl acetal FL/FR (E)-3- hexenal FL 2- hexenal diethyl acetal FL (E)-2- hexenal propylene glycol acetal FL/FR (Z)-3- hexenoic acid FL 3- hexenyl acetate FL/FR hexyl (E)-2-hexenoate FL hexyl heptanoate FL/FR hexyl nonanoate FL/FR hexyl propionate FL/FR hexyl valerate FL/FR methyl (E)-2-hexenoate FL/FR methyl 2-hexenoate FL/FR methyl 3-acetoxyoctanoate FL/FR methyl 3-hydroxybutyrate FL 4- methyl 4-mercaptopentan-2-one 1% solution FL/FR (E)- methyl geranate FL/FR 5- methyl hexanoic acid FL methyl octadienoate FL/FR 4- methyl valeric acid FL 2- methyl-3-heptanone FL 3- methyl-3-pentanol FL (E,E)-3,5- octadien-2-one FL 3- octyl butyrate FL 2- pentenal FL/FR 4- phenyl-2-butyl acetate FL/FR prenyl hexanoate FL/FR propylene acetal FL/FR (E,E)- sorbyl butyrate FL/FR (E,E)- sorbyl isobutyrate FL/FR tetrahydrocitral FL/FR viridiflorol FL/FR sorbyl isobutyrate FL/FR acidic acidic iso butyric acid FL/FR alliaceous tropical thiazole FL/FR berry heptyl isobutyrate FL/FR buttery 2,3- heptane dione FL/FR 2- methyl valeric acid FL/FR (E)-2- pentenoic acid FL cheesy hexanoic acid FL/FR citrus cilantro leaf oil FL/FR cooling manzanate (Givaudan) FL/FR creamy acetoin butyrate FL butyl butyryl lactate FL/FR 2,4- heptadienal FL 2- methyl-4-pentenoic acid FL octyl isobutyrate FL/FR dairy methyl butyl phenyl acetate FL/FR 4- pentenoic acid FL 2- pentyl acetate FL/FR earthy 1- hexen-3-yl acetate FL estery ethyl acetoacetate FL/FR fatty dimethyl sulfoxide FL ethyl (E)-4-decenoate FL/FR nonanoic acid FL/FR (E)-2- octenoic acid FL fermented methyl thio isovalerate FL floral cinnamyl propionate FL/FR dihydrocarvyl acetate FL/FR (±)-2,3- dihydrofarnesol FL/FR (E)- geranyl acetone FL/FR geranyl isobutyrate FL/FR (Z)-3- hexen-1-yl anthranilate FL/FR fruity iso amyl benzoate FL/FR iso amyl isobutyrate FL/FR iso amyl valerate FL/FR apple ketal FL/FR artemisia pallens herb oil FL/FR boronia absolute FL/FR iso butyl propionate FL/FR cherry pentenoate FL/FR black currant bud absolute replacer FL/FR cyclohexyl carboxylic acid FL/FR cyclohexyl propionate FL/FR davana oil CO2 extract FL/FR diethyl malonate FL/FR dimethyl succinate FL/FR ethyl (E)-2-decenoate FL/FR ethyl (E)-2-hexenoate FL/FR ethyl (E)-3-hexenoate FL/FR ethyl 2-octenoate FL/FR ethyl hexanoate FL/FR ethyl levulinate FL/FR ethyl methyl-para-tolyl glycidate FL/FR (E,E)- ethyl sorbate FL/FR filbert hexenone FL/FR furfuryl propionate FL 2- heptanol FL/FR 4- heptanone FL/FR 2- hexen-1-ol FL/FR (Z)-3- hexen-1-yl (E)-2-hexenoate FL/FR (E)-3- hexen-1-yl acetate FL/FR (Z)-3- hexen-1-yl isobutyrate FL/FR hexyl acetate FL/FR hexyl lactate FL/FR kiwi distillates FL methyl (E)-2-octenoate FL/FR methyl 2-methyl butyrate FL/FR methyl 4-methyl valerate FL/FR para- methyl benzyl acetate FL/FR 2- methyl butyl isovalerate FL/FR 2- methyl butyric acid FL/FR methyl heptanoate FL/FR methyl valerate FL/FR 3- methyl-2-butenal FL/FR (Z)-3- nonen-1-yl acetate FL (Z)-5- octen-1-yl acetate FL octen-1-yl cyclopentanone FL/FR 3- phenyl propyl hexanoate FL/FR pineapple pentenoate FL/FR sorbyl butyrate FL/FR tetrahydrofurfuryl butyrate FL/FR tropical trithiane FL/FR green acetaldehyde ethyl phenethyl acetal FL/FR actinidia chinensis fruit extract FL/FR allyl butyrate FL/FR benzaldehyde dimethyl acetal FL/FR cumin acetaldehyde FL/FR iso cyclocitral (IFF) FL/FR cyclohexyl formate FL/FR 3- decen-2-one FL/FR galbanum oil terpeneless FL/FR galbanum oleoresin FL/FR geranyl formate FL/FR geranyl isovalerate FL/FR green note propionate FL/FR (E,E)-2,4- hexadienal FL hexanal (aldehyde C-6) FL/FR (Z)-2- hexen-1-ol FL/FR (E)-2- hexen-1-ol FL/FR (Z)-3- hexen-1-yl 2-methyl butyrate FL/FR (E)-2- hexen-1-yl acetate FL/FR (Z)-3- hexen-1-yl acetate FL/FR (Z)-3- hexen-1-yl hexanoate FL/FR (Z)-3- hexen-1-yl isovalerate FL/FR (E)-2- hexen-1-yl propionate FL/FR (E)-2- hexen-1-yl valerate FL/FR (Z)-3- hexen-1-yl valerate FL/FR 3- hexenal FL/FR (E)-2- hexenal FL/FR hexyl (E)-tiglate FL/FR hexyl isobutyrate FL/FR hexyl isovalerate FL/FR hexyl octanoate FL/FR methyl (E)-3-hexenoate FL/FR methyl 2-undecynoate FL 4- methyl-2-pentenal FL (E)-2- octen-1-yl acetate FL/FR papaya isobutyrate FL/FR (E)-2- pentenal FL/FR 2- pentyl furan FL/FR thiogeraniol FL/FR herbal iso amyl heptanoate FL/FR tagete oil india FL/FR meaty 2- methyl 3-(methyl thio) furan FL minty carvyl acetate FL/FR musty S-( methyl thio) butyrate FL/FR nutty nutty quinoxaline FL/FR oily 2- methyl hexanoic acid FL/FR pungent acetaldehyde FL sour butyric acid FL/FR 2,4- dimethyl-2-pentenoic acid FL 3- methyl valeric acid FL sulfurous methyl 4-(methyl thio) butyrate FL sweet cyclohexyl acetic acid FL/FR toasted acetyl propionyl FL/FR waxy iso amyl butyrate FL/FR 2- methyl heptanoic acid FL/FR 2- nonanol FL/FR octanol FL/FR octyl 2-methyl butyrate FL/FR octyl butyrate FL/FR phenethyl hexanoate FL/FR undecanoic acid FL/FR woody (Z)- jasmone FL/FR (1S,5R)- myrtenyl acetate FL/FR   Potential Uses: FL almond FR fern FR fruit FL green FR hawthorn FL nut   Occurrence (nature, food, other):note   apple plant Search Trop Picture   burdock root Search Trop Picture   clary sage oil greece @ 0.15% Data GC Search Trop Picture   cucumber fruit Search Trop Picture   currant black currant fruit Search Trop Picture   elder black elder flower oil Search Trop Picture   elder black elder leaf oil Search Trop Picture   ginkgo biloba plant Search Trop Picture   lavandin oil grosso @ trace% Data GC Search Trop Picture   oregano shoot Search Trop Picture   soybean plant Search Trop Picture   tagete flower oil rwanda @ trace% Data GC Search Trop Picture   tagete oil rwanda @ 0.03% Data GC Search Trop Picture   violet leaf absolute @ 1.30% Data GC Search Trop Picture   walnut english walnut leaf Search Trop Picture   Synonyms:   hex-2-en-1-al   hex-2-enal (Z+E)-2- hexen-1-al 2- hexen-1-al   hexen-2-en-1-al alpha,beta- hexylenaldehyde   hexylenic aldehyde   leaf aldehyde 3- propyl acrolein beta- propyl acrolein 3- propyl-acrolein   Articles:   None found yet. Try the PubMed Search.

Notes: product of lipid peroxidation in the rat liver; a green odor chemical; do not confuse with the hexabarbital synonym, hexenal. Constit. of many foods. Flavouring ingredient