- 2-Methyl-2-pentenoic acid
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- $32.00 / 1kg
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2025-09-25
- CAS:3142-72-1
- Min. Order: 1kg
- Purity: 99%
- Supply Ability: g-kg-tons, free sample is available
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| | 2-Methyl-2-pentenoic acid Basic information |
| | 2-Methyl-2-pentenoic acid Chemical Properties |
| Melting point | 26-28 °C(lit.) | | Boiling point | 123-125 °C30 mm Hg(lit.) | | density | 0.979 g/mL at 25 °C | | vapor density | >1 (vs air) | | refractive index | n20/D 1.46(lit.) | | FEMA | 3195 | 2-METHYL-2-PENTENOIC ACID | | Fp | 226 °F | | storage temp. | Sealed in dry,Room Temperature | | pka | 5.00±0.19(Predicted) | | form | powder to lump | | color | White to Almost white | | Odor | at 10.00 % in dipropylene glycol. dry acid sweaty strawberry woody fruity jam | | Odor Type | acidic | | FreezingPoint | 20.0 to 25.0 ℃ | | JECFA Number | 1210 | | Major Application | flavors and fragrances | | Cosmetics Ingredients Functions | PERFUMING | | InChI | 1S/C6H10O2/c1-3-4-5(2)6(7)8/h4H,3H2,1-2H3,(H,7,8)/b5-4+ | | InChIKey | JJYWRQLLQAKNAD-SNAWJCMRSA-N | | SMILES | CC/C=C(C)/C(O)=O | | LogP | 1.89 | | CAS DataBase Reference | 3142-72-1(CAS DataBase Reference) | | NIST Chemistry Reference | 2-Pentenoic acid, 2-methyl-(3142-72-1) | | EPA Substance Registry System | 2-Pentenoic acid, 2-methyl- (3142-72-1) |
| Hazard Codes | C | | Risk Statements | 34-22-41 | | Safety Statements | 26-36/37/39-45 | | RIDADR | UN 3261 8/PG 3 | | WGK Germany | 2 | | TSCA | TSCA listed | | HazardClass | 8 | | PackingGroup | III | | HS Code | 29161900 | | Storage Class | 8A - Combustible corrosive hazardous materials | | Hazard Classifications | Eye Dam. 1
Skin Corr. 1B |
| | 2-Methyl-2-pentenoic acid Usage And Synthesis |
| Description | May be prepared by distillation of 2-hydroxy-2-methylvaleric acid
(m-form). | | Chemical Properties | 2-Methyl-2-pentenoic acid has a fruity odor. | | Chemical Properties | white semi-transparent crystalline | | Chemical Properties | With a
dry acid note, 2-Methyl-2-pentenoic Acid is found in the odor of strawberries.The acid can be prepared from the
corresponding saturated one by α-bromination followed by dehydrobromination.
It is used in fragrances to enhance fruity notes and in strawberry flavors. | | Occurrence | Reported found in strawberry | | Uses | 2-Methyl-2-pentenoic Acid (CAS# 3142-72-1) can be used for cleansing and refreshing hair and scalp. It can also be used to store and cure food products, and for providing a long-lasting strawberry odor. | | Definition | ChEBI: 2-Methyl-2-pentenoic acid is a methyl-branched fatty acid. It is a conjugate acid of a 2-methyl-(2E)-pentenoate(1-). | | Preparation | By distillation of 2-hydroxy-2-methylvaleric acid (cis-form). | | Taste threshold values | Taste characteristics at 50 ppm: sour, acidic, sweaty, berry and fruit-like. | | Synthesis | General procedure for the synthesis of 2-methyl-2-pentenenitrile (CAS: 99839-14-2) as a raw material for the synthesis of 2-methyl-2-pentenoic acid: 220 g of 65% phosphoric acid was added to the reaction flask and the temperature of the reaction system was raised to 100 °C. The temperature of the reaction system was raised to 50 °C. The reaction flask was then charged to the reaction flask. 100 g of 2-methyl-2-pentenenitrile was slowly added dropwise over a period of 5 hours, and the temperature was lowered to 50 °C after completion of the dropwise addition. To the reaction mixture was added 150 g of water followed by extraction with 300 g of toluene in three portions (100 g each). The organic phases were combined and purified by distillation. The solvent was first recovered and then the fractions were collected at 82 °C/3 mmHg to give 110 g of 2-methyl-2-pentenoic acid in 98.5% purity and 92% yield. | | References | [1] Patent: CN103539655, 2016, B. Location in patent: Paragraph 0036; 0037 |
| | 2-Methyl-2-pentenoic acid Preparation Products And Raw materials |
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