| Record Information |
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| Version | 5.0 |
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| Status | Expected but not Quantified |
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| Creation Date | 2008-10-15 12:12:16 UTC |
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| Update Date | 2023-02-21 17:17:25 UTC |
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| HMDB ID | HMDB0010720 |
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| Secondary Accession Numbers | |
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| Metabolite Identification |
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| Common Name | But-2-enoic acid |
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| Description | But-2-enoic acid, also known as (2E)-2-butenoate or alpha-crotonic acid, belongs to the class of organic compounds known as straight chain organic acids. These are organic acids with a straight aliphatic chain. But-2-enoic acid is a very hydrophobic molecule, practically insoluble in water, and relatively neutral. |
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| Structure | InChI=1S/C4H6O2/c1-2-3-4(5)6/h2-3H,1H3,(H,5,6)/b3-2+ |
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| Synonyms | | Value | Source |
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| (2E)-2-Butenoic acid | ChEBI | | (e)-2-Butenoic acid | ChEBI | | (e)-But-2-enoic acid | ChEBI | | (e)-Crotonic acid | ChEBI | | 2-Butenoic acid | ChEBI | | 3-Methylacrylic acid | ChEBI | | alpha-Butenoic acid | ChEBI | | alpha-Crotonic acid | ChEBI | | BEO | ChEBI | | beta-Methacrylic acid | ChEBI | | beta-Methylacrylic acid | ChEBI | | trans-2-Butenoic acid | ChEBI | | trans-Crotonic acid | ChEBI | | Crotonic acid | Kegg | | (2E)-2-Butenoate | Generator | | (e)-2-Butenoate | Generator | | (e)-But-2-enoate | Generator | | (e)-Crotonate | Generator | | 2-Butenoate | Generator | | 3-Methylacrylate | Generator | | a-Butenoate | Generator | | a-Butenoic acid | Generator | | alpha-Butenoate | Generator | | Α-butenoate | Generator | | Α-butenoic acid | Generator | | a-Crotonate | Generator | | a-Crotonic acid | Generator | | alpha-Crotonate | Generator | | Α-crotonate | Generator | | Α-crotonic acid | Generator | | b-Methacrylate | Generator | | b-Methacrylic acid | Generator | | beta-Methacrylate | Generator | | Β-methacrylate | Generator | | Β-methacrylic acid | Generator | | b-Methylacrylate | Generator | | b-Methylacrylic acid | Generator | | beta-Methylacrylate | Generator | | Β-methylacrylate | Generator | | Β-methylacrylic acid | Generator | | trans-2-Butenoate | Generator | | trans-Crotonate | Generator | | Crotonate | Generator | | But-2-enoate | Generator | | (2E)-But-2-enoate | HMDB | | (2E)-But-2-enoic acid | HMDB | | 3-Methyl-acrylic acid | HMDB | | Butenoate | HMDB | | Butenoic acid | HMDB | | Kyselina krotonova | HMDB | | Solid crotonic acid | HMDB |
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| Chemical Formula | C4H6O2 |
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| Average Molecular Weight | 86.0892 |
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| Monoisotopic Molecular Weight | 86.036779436 |
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| IUPAC Name | (2E)-but-2-enoic acid |
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| Traditional Name | butenoic acid |
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| CAS Registry Number | 3724-65-0 |
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| SMILES | C\C=C\C(O)=O |
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| InChI Identifier | InChI=1S/C4H6O2/c1-2-3-4(5)6/h2-3H,1H3,(H,5,6)/b3-2+ |
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| InChI Key | LDHQCZJRKDOVOX-NSCUHMNNSA-N |
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| Chemical Taxonomy |
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| Description | Belongs to the class of organic compounds known as straight chain fatty acids. These are fatty acids with a straight aliphatic chain. |
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| Kingdom | Organic compounds |
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| Super Class | Lipids and lipid-like molecules |
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| Class | Fatty Acyls |
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| Sub Class | Fatty acids and conjugates |
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| Direct Parent | Straight chain fatty acids |
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| Alternative Parents | |
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| Substituents | - Unsaturated fatty acid
- Straight chain fatty acid
- Monocarboxylic acid or derivatives
- Carboxylic acid
- Carboxylic acid derivative
- Organic oxygen compound
- Organic oxide
- Hydrocarbon derivative
- Organooxygen compound
- Carbonyl group
- Aliphatic acyclic compound
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| Molecular Framework | Aliphatic acyclic compounds |
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| External Descriptors | |
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| Ontology |
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| Physiological effect | |
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| Disposition | |
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| Process | |
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| Role | Not Available |
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| Physical Properties |
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| State | Solid |
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| Experimental Molecular Properties | |
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| Experimental Chromatographic Properties | Not Available |
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| Predicted Molecular Properties | |
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| Predicted Chromatographic Properties | Predicted Collision Cross SectionsPredicted Retention Times Underivatized| Chromatographic Method | Retention Time | Reference |
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| Measured using a Waters Acquity ultraperformance liquid chromatography (UPLC) ethylene-bridged hybrid (BEH) C18 column (100 mm × 2.1 mm; 1.7 μmparticle diameter). Predicted by Afia on May 17, 2022. Predicted by Afia on May 17, 2022. | 2.37 minutes | 32390414 | | Predicted by Siyang on May 30, 2022 | 10.6018 minutes | 33406817 | | Predicted by Siyang using ReTip algorithm on June 8, 2022 | 4.77 minutes | 32390414 | | Fem_Long = Waters ACQUITY UPLC HSS T3 C18 with Water:MeOH and 0.1% Formic Acid | 1263.8 seconds | 40023050 | | Fem_Lipids = Ascentis Express C18 with (60:40 water:ACN):(90:10 IPA:ACN) and 10mM NH4COOH + 0.1% Formic Acid | 393.8 seconds | 40023050 | | Life_Old = Waters ACQUITY UPLC BEH C18 with Water:(20:80 acetone:ACN) and 0.1% Formic Acid | 121.1 seconds | 40023050 | | Life_New = RP Waters ACQUITY UPLC HSS T3 C18 with Water:(30:70 MeOH:ACN) and 0.1% Formic Acid | 277.7 seconds | 40023050 | | RIKEN = Waters ACQUITY UPLC BEH C18 with Water:ACN and 0.1% Formic Acid | 80.8 seconds | 40023050 | | Eawag_XBridgeC18 = XBridge C18 3.5u 2.1x50 mm with Water:MeOH and 0.1% Formic Acid | 337.5 seconds | 40023050 | | BfG_NTS_RP1 =Agilent Zorbax Eclipse Plus C18 (2.1 mm x 150 mm, 3.5 um) with Water:ACN and 0.1% Formic Acid | 394.9 seconds | 40023050 | | HILIC_BDD_2 = Merck SeQuant ZIC-HILIC with ACN(0.1% formic acid):water(16 mM ammonium formate) | 183.5 seconds | 40023050 | | UniToyama_Atlantis = RP Waters Atlantis T3 (2.1 x 150 mm, 5 um) with ACN:Water and 0.1% Formic Acid | 777.7 seconds | 40023050 | | BDD_C18 = Hypersil Gold 1.9µm C18 with Water:ACN and 0.1% Formic Acid | 291.6 seconds | 40023050 | | UFZ_Phenomenex = Kinetex Core-Shell C18 2.6 um, 3.0 x 100 mm, Phenomenex with Water:MeOH and 0.1% Formic Acid | 988.0 seconds | 40023050 | | SNU_RIKEN_POS = Waters ACQUITY UPLC BEH C18 with Water:ACN and 0.1% Formic Acid | 273.5 seconds | 40023050 | | RPMMFDA = Waters ACQUITY UPLC BEH C18 with Water:ACN and 0.1% Formic Acid | 332.1 seconds | 40023050 | | MTBLS87 = Merck SeQuant ZIC-pHILIC column with ACN:Water and :ammonium carbonate | 607.0 seconds | 40023050 | | KI_GIAR_zic_HILIC_pH2_7 = Merck SeQuant ZIC-HILIC with ACN:Water and 0.1% FA | 305.7 seconds | 40023050 | | Meister zic-pHILIC pH9.3 = Merck SeQuant ZIC-pHILIC column with ACN:Water 5mM NH4Ac pH9.3 and 5mM ammonium acetate in water | 135.9 seconds | 40023050 |
Predicted Kovats Retention IndicesUnderivatizedDerivatized |
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| GC-MS Spectra| Spectrum Type | Description | Splash Key | Deposition Date | Source | View |
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| Experimental GC-MS | GC-MS Spectrum - But-2-enoic acid EI-B (Non-derivatized) | splash10-000l-9000000000-c066ee0b8aa28cc564f5 | 2017-09-12 | HMDB team, MONA, MassBank | View Spectrum | | Experimental GC-MS | GC-MS Spectrum - But-2-enoic acid EI-B (Non-derivatized) | splash10-000l-9000000000-c066ee0b8aa28cc564f5 | 2018-05-18 | HMDB team, MONA, MassBank | View Spectrum | | Predicted GC-MS | Predicted GC-MS Spectrum - But-2-enoic acid GC-MS (Non-derivatized) - 70eV, Positive | splash10-000f-9000000000-dcef1149fbd6447033ad | 2016-09-22 | Wishart Lab | View Spectrum | | Predicted GC-MS | Predicted GC-MS Spectrum - But-2-enoic acid GC-MS (1 TMS) - 70eV, Positive | splash10-0103-9100000000-bb87072a7225402c6d0e | 2017-10-06 | Wishart Lab | View Spectrum | | Predicted GC-MS | Predicted GC-MS Spectrum - But-2-enoic acid GC-MS (Non-derivatized) - 70eV, Positive | Not Available | 2021-10-12 | Wishart Lab | View Spectrum |
MS/MS Spectra| Spectrum Type | Description | Splash Key | Deposition Date | Source | View |
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| Experimental LC-MS/MS | LC-MS/MS Spectrum - But-2-enoic acid LC-ESI-QQ , negative-QTOF | splash10-000i-9000000000-139e86f163451c657b84 | 2017-09-14 | HMDB team, MONA | View Spectrum | | Experimental LC-MS/MS | LC-MS/MS Spectrum - But-2-enoic acid LC-ESI-QQ , negative-QTOF | splash10-000i-9000000000-b1e1c9a0bcfd328b1cd9 | 2017-09-14 | HMDB team, MONA | View Spectrum | | Experimental LC-MS/MS | LC-MS/MS Spectrum - But-2-enoic acid LC-ESI-QQ , negative-QTOF | splash10-0006-9000000000-e0d8bcef7823a57ace6b | 2017-09-14 | HMDB team, MONA | View Spectrum | | Experimental LC-MS/MS | LC-MS/MS Spectrum - But-2-enoic acid LC-ESI-QQ , negative-QTOF | splash10-0006-9000000000-f496e2b96544aa9df21d | 2017-09-14 | HMDB team, MONA | View Spectrum | | Experimental LC-MS/MS | LC-MS/MS Spectrum - But-2-enoic acid 10V, Negative-QTOF | splash10-000f-9000000000-5905542348788794febc | 2021-09-20 | HMDB team, MONA | View Spectrum | | Experimental LC-MS/MS | LC-MS/MS Spectrum - But-2-enoic acid 40V, Negative-QTOF | splash10-0006-9000000000-b58156e5b9ec6e1ed71e | 2021-09-20 | HMDB team, MONA | View Spectrum | | Experimental LC-MS/MS | LC-MS/MS Spectrum - But-2-enoic acid 20V, Negative-QTOF | splash10-0006-9000000000-14c905772071113e3bef | 2021-09-20 | HMDB team, MONA | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - But-2-enoic acid 10V, Positive-QTOF | splash10-00kr-9000000000-1dc3bc86132e73942861 | 2016-08-03 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - But-2-enoic acid 20V, Positive-QTOF | splash10-00ko-9000000000-d17c17c2c66a97ee9c27 | 2016-08-03 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - But-2-enoic acid 40V, Positive-QTOF | splash10-0006-9000000000-4cd5b916c7ee6039effc | 2016-08-03 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - But-2-enoic acid 10V, Negative-QTOF | splash10-000i-9000000000-dde621f263ff3ac72841 | 2016-08-03 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - But-2-enoic acid 20V, Negative-QTOF | splash10-000l-9000000000-dce352f985fb5e143263 | 2016-08-03 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - But-2-enoic acid 40V, Negative-QTOF | splash10-00kf-9000000000-acd6176b8c6ebe251635 | 2016-08-03 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - But-2-enoic acid 10V, Negative-QTOF | splash10-000i-9000000000-ec20127c74818b1f634d | 2021-09-22 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - But-2-enoic acid 20V, Negative-QTOF | splash10-00kr-9000000000-acc7f4424bb0833d9f87 | 2021-09-22 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - But-2-enoic acid 40V, Negative-QTOF | splash10-014l-9000000000-f6cecaee0aa536b15160 | 2021-09-22 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - But-2-enoic acid 10V, Positive-QTOF | splash10-00kf-9000000000-1462d04bf056a8a82ccd | 2021-09-22 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - But-2-enoic acid 20V, Positive-QTOF | splash10-0006-9000000000-210cae383690d066d0e0 | 2021-09-22 | Wishart Lab | View Spectrum | | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - But-2-enoic acid 40V, Positive-QTOF | splash10-0006-9000000000-1aa1299c9e5efe8dc421 | 2021-09-22 | Wishart Lab | View Spectrum |
NMR Spectra| Spectrum Type | Description | Deposition Date | Source | View |
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| Predicted 1D NMR | 13C NMR Spectrum (1D, 100 MHz, H2O, predicted) | 2022-08-18 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 1H NMR Spectrum (1D, 100 MHz, H2O, predicted) | 2022-08-18 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 13C NMR Spectrum (1D, 1000 MHz, H2O, predicted) | 2022-08-18 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 1H NMR Spectrum (1D, 1000 MHz, H2O, predicted) | 2022-08-18 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 13C NMR Spectrum (1D, 200 MHz, H2O, predicted) | 2022-08-18 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 1H NMR Spectrum (1D, 200 MHz, H2O, predicted) | 2022-08-18 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 13C NMR Spectrum (1D, 300 MHz, H2O, predicted) | 2022-08-18 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 1H NMR Spectrum (1D, 300 MHz, H2O, predicted) | 2022-08-18 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 13C NMR Spectrum (1D, 400 MHz, H2O, predicted) | 2022-08-18 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 1H NMR Spectrum (1D, 400 MHz, H2O, predicted) | 2022-08-18 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 13C NMR Spectrum (1D, 500 MHz, H2O, predicted) | 2022-08-18 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 1H NMR Spectrum (1D, 500 MHz, H2O, predicted) | 2022-08-18 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 13C NMR Spectrum (1D, 600 MHz, H2O, predicted) | 2022-08-18 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 1H NMR Spectrum (1D, 600 MHz, H2O, predicted) | 2022-08-18 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 13C NMR Spectrum (1D, 700 MHz, H2O, predicted) | 2022-08-18 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 1H NMR Spectrum (1D, 700 MHz, H2O, predicted) | 2022-08-18 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 13C NMR Spectrum (1D, 800 MHz, H2O, predicted) | 2022-08-18 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 1H NMR Spectrum (1D, 800 MHz, H2O, predicted) | 2022-08-18 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 13C NMR Spectrum (1D, 900 MHz, H2O, predicted) | 2022-08-18 | Wishart Lab | View Spectrum | | Predicted 1D NMR | 1H NMR Spectrum (1D, 900 MHz, H2O, predicted) | 2022-08-18 | Wishart Lab | View Spectrum |
IR Spectra| Spectrum Type | Description | Deposition Date | Source | View |
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| Predicted IR Spectrum | IR Ion Spectrum (Predicted IRIS Spectrum, Adduct: [M-H]-) | 2023-02-03 | FELIX lab | View Spectrum | | Predicted IR Spectrum | IR Ion Spectrum (Predicted IRIS Spectrum, Adduct: [M+H]+) | 2023-02-03 | FELIX lab | View Spectrum | | Predicted IR Spectrum | IR Ion Spectrum (Predicted IRIS Spectrum, Adduct: [M+Na]+) | 2023-02-03 | FELIX lab | View Spectrum |
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