isobutyl 2-butenoate
isobutyl crotonate
Flavouring ingredient
  • Alfrebro
    • Alfrebro LLC
      Let's get reacquainted
      Building great taste with aroma chemicals, extracts, and distillates
      The Alfrebro brand was established in the early 1900s by Alex Fries & Brothers, a Cincinnati Flavor Company. In 1980, the brand was re-launched as an aroma chemical manufacturer. Since its inception, Alfrebro’s primary focus has been to provide quality natural and high value synthetic chemicals.
      Email: Sarah Forbis
      Email: Sales
      Voice: 513-539-3021
      Fax: 513-539-7372
      US Voice: 513-539-7373
  • Apiscent Labs
    • Apiscent Labs, LLC
      Delivery of Quality
      Custom manufacturer and international supplier of fine ingredients.
      We believe inspired chemistry enriches lives. That's why our team is guided by a mission to provide fine ingredients to the worldwide pharmaceutical, flavor and fragrance markets with a primary focus on the manufacturing of value-added, research-based molecules. We're innovative problem solvers committed to excellence at every phase. Our work builds the foundation for our clients' continued success.
      Email: Info
      Email: Carl Sheeley
      Email: Customer Service
      Voice: +1 (414) 744 3993
      Fax: +1 (414) 744 7111
  • Bedoukian Research
    • Bedoukian Research, Inc.
      Constantly Improving
      Working closely with our customers to meet their requirements.
      Paul Bedoukian founded the company to fill a niche as a supplier of high quality specialty aroma and flavor ingredients. In 1975 the company began manufacturing insect pheromones which are chemically similar to flavor and fragrance ingredients. Today, Bedoukian Research offers more than 450 Aroma Chemicals and 50 Insect Pheromones, while also providing custom manufacturing services to the pharmaceutical, agrochemical, and specialty chemical industries.
      US Email: Customer Service
      US Voice: 1-203-830-4000
      US Fax: 1-203-830-4010
      Products List: View
      972 ISOBUTYL 2-BUTENOATE (CROTONATE) ≥99.0%, FCC, Kosher
      Can enhance berry qualities of fragrances.
      Sweet, fruity candy notes for all types of fruit flavors, especially pineapple and other tropical fruits.
  • Charkit Chemical
    • Charkit Chemical Corporation
      The Specialty Chemical Specialists
      Explore this website to discover the products and services that Charkit provides for your industry and please contact us directly to find out how we can be of service to you.
      Since 1982, Charkit has been committed to expanding the markets we serve and our roster of products and services continues to grow with us. Personal care ingredients now include a substantial array of luxury and exotic components. Substantial inroads have been made in the nutraceutical and resins markets, with a growing roster of versatile and unique ingredients. And we continue to lead the way in our traditional markets such as Metal and Water Treatment, Imaging, Flavor & Fragrance, Aroma and Food. Our Pharmaceutical offerings continue to expand, still anchored by the Boronic Derivatives that meet the demands of Suzuki coupling reactions.
      Email: Sales
      Voice: 203-299-3220
      Fax: 203-299-1355
      Products List: View
  • Frutarom
    • Frutarom Ltd
      Discover Our Passion
      Your preferred partner for flavour and fragrance success.
      At Frutarom, we take pride in our expertise and knowledge of Flavour & Fragrance Ingredients and our thorough understanding of the needs of Flavourists, Perfumers and Food Technologists. Working closely with our customers we have a strong track record of providing unique solutions to fulfil requirements.
      US Email: Info- USA
      Email: Info - UK
      Voice: +44 (0) 1429 863 222
      US Voice: +1 513 870 4900
      Products List: View
      I0700-3 ISOBUTYL 2-BUTENOATE ≥99.00%, NI, Kosher
      Suggested Uses: Apple, Banana, Hard Fruits, Liquorice, Pineapple, Plum, Soft Fruits, Tropical Fruits
  • Penta International
    • Penta International Corporation
      Chemistry innovation
      At Penta, our products and services help businesses do business better.
      For over 30 years, Penta Manufacturing Company has played a growing role in worldwide chemistry innovations and applications. As an industry leader, Penta continues to pioneer chemistry-based solutions for practically every area of commerce. Our products and expertise have helped fuel technical advances in dozens of commercial applications including flavoring, coloring, fragrances and chemical processes.
      US Email: Technical Services
      US Email: Sales
      US Voice: (973) 740-2300
      US Fax: (973) 740-1839
      09-37900 ISOBUTYL-2-BUTENOATE, Kosher
      09-37905 isoBUTYL 2-BUTENOATE NATURAL, Kosher
  • SRS Aromatics
    • SRS Aromatics Ltd
      For over 25 years
      Bringing flavour and fragrance into your world.
      As suppliers / distributors of ingredients to the fragrance and flavour industries, our goal is to provide high quality materials at competitive prices with an exceptional level of service. Established in 1984, SRS Aromatics Ltd is an independent family owned business which has become very well-respected within the fragrance and flavour industry as a reliable and trustworthy partner. Over the years this has allowed the company to develop strong relationships with many global manufacturers; several of whom we represent in the UK. A core aim of our business is to work extremely closely with both our suppliers and customers to maximise service levels with minimum disruption to supply.
      Email: Info
      Email: Sales
      Voice: +44 (0) 1284 704076
      Fax: +44 (0) 1284 760819
  • Taytonn
      Supplying Asia Pacific
      We fully understand the demands of the F&F industry and we endeavour to supply quality products, with ready availability and a personalised service.
      Since 2001 TAYTONN has been distributing key ingredients to the Fragrance and Flavor industry in Asia. We work closely with customers, principals and vendors. Together we forecast demand and match it with supply of aroma chemicals, essential oils and natural isolates & extracts. Sourced from around the world, our F&F ingredient inventory in Singapore is ready to ship to any location in Asia and beyond. Time and again, we help our principals introduce new discoveries to the F&F market - stimulating creativity and bringing value added proposition to our customers.
      Email: Info
      Email: Sales
      Voice: + 65 - 6861 8113
      Fax: + 65 - 6861 8115
      isoButyl 2-butenoate
Synonyms   Articles   Notes   Search
2-methylpropyl but-2-enoate (Click)
CAS Number: 589-66-2Picture of molecule
ECHA EINECS - REACH Pre-Reg: 209-658-5
MDL: MFCD00036651
CoE Number: 10706
XlogP3-AA: 2.30 (est)
Molecular Weight: 142.19798000
Formula: C8 H14 O2
NMR Predictor: Predict (works with chrome or firefox)
EFSA/JECFA Comments: CASrn does not specify stereoisomers. According to JECFA: Min. assay value is "95 % of C8H16O2". Mixture of (Z)- and (E)-isomer (EFFA, 2010). CASrn in Register does not specify stereoisomeric composition. 70-85 % (E) and 10-35 % (Z) (EFFA, 2013). According to JECFA: Min. assay value is "95 % of C8H16O2".
Category: flavor and fragrance 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
IBM Patents: Obtain
Pubchem Patents: Search
PubMed: Search
NCBI: Search
JECFA Food Flavoring: 1206  isobutyl 2-butenoate
Flavis Number: 09.273 (Old)
DG SANTE Food Flavourings: 09.273  isobutyl crotonate
FEMA Number: 3432  isobutyl 2-butenoate
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Physical Properties:
Appearance: colorless clear liquid (est)
Assay: 95.00 to 100.00 % 
Food Chemicals Codex Listed: Yes
Specific Gravity: 0.89000 @  25.00 °C.
Specific Gravity: 0.88000 to 0.90000 @  25.00 °C.
Pounds per Gallon - est.: 7.322 to 7.489
Boiling Point: 171.00 °C. @ 760.00 mm Hg
Boiling Point: 70.00 °C. @ 15.00 mm Hg
Vapor Pressure: 1.788000 mm/Hg @ 25.00 °C. (est)
Vapor Density: 4.6 ( Air = 1 )
Flash Point: 131.00 °F. TCC ( 55.00 °C. )
logP (o/w): 2.669 (est)
Soluble in:
 fixed oils
 propylene glycol
 water, slightly
 water, 555.2 mg/L @ 25 °C (est)
Insoluble in:
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Organoleptic Properties:
Odor Type: fruity
Odor Strength: medium
 fruity  dry  tropical  rummy  ripe  green  pear  caramellic  
Odor Description:
at 100.00 %. 
fruity dry tropical rummy ripe green pear (caramellic is the long drydown)
Luebke, William tgsc, (1996)
 woody  fruity  brown  ripe  alcoholic  cognac  rummy  
Odor Description:
Woody, fruity, brown, ripe and alcoholic-like with cognac and rum nuances
Mosciano, Gerard P&F 20, No. 6, 49, (1995)
 sweet  green  chemical  alcoholic  licorice  tropical  fruity  
Taste Description:
Sweet, green, chemical and alcoholic-like with licorice, tropical and fruity nuances
Mosciano, Gerard P&F 20, No. 6, 49, (1995)
Substantivity: 137 hour(s) at 100.00 %
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Cosmetic Information:
None found
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Odor: Fruity
Apiscent Labs
Odor: Fruity
Apple Flavor & Fragrance
Isobutyl crotonate
Bedoukian Research
≥99.0%, FCC, Kosher
Odor: A fruity, rum-like character
Use: Can enhance berry qualities of fragrances.
Flavor: Sweet, fruity, tropical, candy pineapple
Sweet, fruity candy notes for all types of fruit flavors, especially pineapple and other tropical fruits.
Charkit Chemical
≥99.00%, NI, Kosher
Odor: Banana, Fruity, Pineapple, Sweet
Use: Suggested Uses: Apple, Banana, Hard Fruits, Liquorice, Pineapple, Plum, Soft Fruits, Tropical Fruits
Grau Aromatics
NI, Kosher
Inoue Perfumery
Penta International
Penta International
Reincke & Fichtner
isoButyl 2-butenoate
Santa Cruz Biotechnology
For experimental / research use only.
isoButyl Crotonate
Shanghai Vigen Fine Chemical
isoButyl Crotonate
SRS Aromatics
isoButyl 2-butenoate
For experimental / research use only.
isoButyl Crotonate >98.0%(GC)
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Safety Information:
Preferred SDS: View
European information :
Most important hazard(s):
Xi - Irritant
R 10 - Flammable.
R 36/37/38 - Irritating to eyes, respiratory system, and skin.
S 02 - Keep out of the reach of children.
S 26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S 36 - Wear suitable protective clothing.
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
Hazard statement(s)
None found.
Precautionary statement(s)
None found.
Oral/Parenteral Toxicity:
Not determined
Dermal Toxicity:
Not determined
Inhalation Toxicity:
Not determined
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Safety in Use Information:
Category: flavor and fragrance agents
Recommendation for isobutyl 2-butenoate usage levels up to:
  5.0000 % in the fragrance concentrate.
Maximised Survey-derived Daily Intakes (MSDI-EU): 0.46 (μg/capita/day)
Maximised Survey-derived Daily Intakes (MSDI-USA): 45.00 (μg/capita/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: 8
Click here to view publication 8
 average usual ppmaverage maximum ppm
baked goods: -5.00000
beverages(nonalcoholic): -3.00000
beverages(alcoholic): --
breakfast cereal: --
cheese: --
chewing gum: -25.00000
condiments / relishes: --
confectionery froastings: -8.00000
egg products: --
fats / oils: --
fish products: --
frozen dairy: -3.00000
fruit ices: -3.00000
gelatins / puddings: -3.00000
granulated sugar: --
gravies: --
hard candy: --
imitation dairy: --
instant coffee / tea: --
jams / jellies: -3.00000
meat products: --
milk products: -3.00000
nut products: --
other grains: --
poultry: --
processed fruits: --
processed vegetables: --
reconstituted vegetables: --
seasonings / flavors: --
snack foods: --
soft candy: --
soups: --
sugar substitutes: --
sweet sauces: --
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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):
Flavouring Group Evaluation 72 (FGE.72): Consideration of aliphatic, branched-chain saturated and unsaturated alcohols, aldehydes, acids, and related esters evaluated by the JECFA (61st meeting) structurally related to branched- and straight-chain unsaturated carboxylic acids. Esters of these and straight-chain aliphatic saturated alcohols evaluated by EFSA in FGE.05Rev2 (2010)
View page or View pdf
Scientific Opinion on Flavouring Group Evaluation 72, Revision 1 (FGE.72Rev1): Consideration of aliphatic, branched-chain saturated and unsaturated alcohols, aldehydes, acids, and related esters evaluated by the JECFA (61st meeting) structurally related to branched- and straight-chain unsaturated carboxylic acids, esters of these and straight-chain aliphatic saturated alcohols evaluated by EFSA in FGE.05Rev2
View page or View pdf
EPI System: View
EPA Substance Registry Services (TSCA): 589-66-2
EPA ACToR: Toxicology Data
EPA Substance Registry Services (SRS): Registry
Laboratory Chemical Safety Summary : 61135
National Institute of Allergy and Infectious Diseases: Data
WISER: UN 3272
WGK Germany: 3
 2-methylpropyl but-2-enoate
Chemidplus: 0000589662
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 2-methylpropyl but-2-enoate
NIST Chemistry WebBook: Search Inchi
Canada Domestic Sub. List: 589-66-2
Pubchem (cid): 61135
Pubchem (sid): 135017868
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Other Information:
(IUPAC): Atomic Weights of the Elements 2009
(IUPAC): Atomic Weights of the Elements 2009 (pdf)
Videos: The Periodic Table of Videos
tgsc: Atomic Weights use for this web site
(IUPAC): Periodic Table of the Elements
FDA Everything Added to Food in the United States (EAFUS): View
HMDB (The Human Metabolome Database): HMDB36212
FooDB: FDB015070
Export Tariff Code: 2916.19.5000
VCF-Online: VCF Volatile Compounds in Food
ChemSpider: View
Read: Under the conditions of intended use - New developments in the FEMA GRAS program and the safety assessment of flavor ingredients
Read: A GRAS assessment program for flavor ingredients
Read: Sensory testing for flavorings with modifying properties. Food Technology
Read: Criteria for the safety evaluation of flavoring substances
Read: A procedure for the safety evaluation of natural flavor complexes used as ingredients in food: essential oils
Read: FEMA Expert Panel: 30 Years of safety evaluation for the flavor industry
Read: Consumption ratio and food predominance of flavoring materials
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Potential Blenders and core components note
For Odor
bitter orange peel oil brazilFL/FR
 decyl propionateFL/FR
 ethyl formateFL/FR
isobutyl decanoateFL/FR
 hexanal diethyl acetalFL/FR
 allyl cyclohexyl acetateFL/FR
 allyl propionateFL/FR
 amyl formateFL/FR
 amyl valerateFL/FR
 ethyl butyrateFL/FR
 ethyl heptanoateFL/FR
 pineapple hydroxyhexanoateFL/FR
 propyl heptanoateFL/FR
 propyl isobutyrateFL/FR
(E)-2-hexen-1-yl valerateFL/FR
 anthemis nobilis flower oil romanFL/FR
 ethyl undecanoateFL/FR
 ethyl methyl mercaptopropionateFL/FR
For Flavor
No flavor group found for these
 amyl valerateFL/FR
isobutyl decanoateFL/FR
 decyl propionateFL/FR
 hexanal diethyl acetalFL/FR
 allyl propionateFL/FR
 ethyl formateFL/FR
 allyl cyclohexyl acetateFL/FR
 amyl formateFL/FR
 ethyl butyrateFL/FR
 ethyl heptanoateFL/FR
 furfuryl isovalerateFL
bitter orange peel oil brazilFL/FR
 pineapple hydroxyhexanoateFL/FR
 propyl isobutyrateFL/FR
(E)-2-hexen-1-yl valerateFL/FR
 anthemis nobilis flower oil romanFL/FR
 ethyl methyl mercaptopropionateFL/FR
 ethyl undecanoateFL/FR
 propyl heptanoateFL/FR
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Potential Uses:
 fruit tropical fruit 
 honey mielFR
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Occurrence (nature, food, other): note
Search  Picture
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2-butenoic acid 2-methyl propyl ester
2-butenoic acid 2-methylpropyl ester
2-butenoic acid, 2-methylpropyl ester
isobutyl 2-butenoate (crotonate)
isobutyl but-2-enoate
isobutyl crotonate
iso-butyl-crotonate FCC
 crotonic acid isobutyl ester
2-methyl propyl 2-butenoate
2-methyl propyl crotonate
2-methylpropyl but-2-enoate
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