3,3-Dimethylacrylic acid
Synonym(s):3,3-Dimethylacrylic acid;3-Methyl-2-butenoic acid;3-Methylcrotonic acid;Senecioic acid
- CAS NO.:541-47-9
- Empirical Formula: C5H8O2
- Molecular Weight: 100.12
- MDL number: MFCD00004366
- EINECS: 208-782-7
- SAFETY DATA SHEET (SDS)
- Update Date: 2024-03-27 13:45:20
What is 3,3-Dimethylacrylic acid ?
Description
May be prepared by the action of alkalis or bases on the ester of α-bromoisovaleric acid; by condensation of acetone with malonic acid or bromoacetic ester; by oxidation of mesityl oxide with sodium hypochlorite.
Chemical properties
White to brown crystal
Chemical properties
3-Methylcrotonic acid has green, phenolic, dairy aroma
Occurrence
Reported found in the rhizomes of Senecio kaempferi Seib.; the corresponding ester occurs naturally in waste wort. Also reported found in raspberries, wheat bread, cocoa, coffee, black tea, Arctic bramble, and green and roasted maté.
The Uses of 3,3-Dimethylacrylic acid
Chemical Intermediates.
Definition
ChEBI: A methyl-branched fatty acid that is but-2-enoic acid bearing a methyl substituent at position 3.
Preparation
By the action of alkalis or bases on the ester of α-bromoisovaleric acid; by condensation of acetone with malonic acid or bromoacetic ester; by oxidation of mesityl oxide with sodium hypochlorite.
Synthesis Reference(s)
Journal of the American Chemical Society, 71, p. 3214, 1949 DOI: 10.1021/ja01177a079
Organic Syntheses, Coll. Vol. 3, p. 302, 1955
Tetrahedron Letters, 36, p. 2469, 1995 DOI: 10.1016/0040-4039(95)00285-K
Purification Methods
Crystallise the acid from hot water or pet ether (b 60-80o). [Beilstein 2 IV 1555.]
Properties of 3,3-Dimethylacrylic acid
Melting point: | 65-70 °C (lit.) |
Boiling point: | 194-195 °C (lit.) |
Density | 0,969 g/cm3 |
refractive index | 1.4226 (estimate) |
FEMA | 3187 | 3-METHYLCROTONIC ACID |
Flash point: | 93°C |
storage temp. | Keep in dark place,Sealed in dry,Room Temperature |
solubility | Chloroform (Slightly), Methanol (Slightly) |
form | Solid |
pka | pK1:5.12 (25°C) |
color | Off-White to Pale Orange |
Odor | at 1.00 % in propylene glycol. green phenolic dairy |
Water Solubility | Soluble in water, and methanol. |
JECFA Number | 1204 |
BRN | 1720305 |
CAS DataBase Reference | 541-47-9(CAS DataBase Reference) |
NIST Chemistry Reference | 2-Butenoic acid, 3-methyl-(541-47-9) |
EPA Substance Registry System | 2-Butenoic acid, 3-methyl- (541-47-9) |
Safety information for 3,3-Dimethylacrylic acid
Signal word | Danger |
Pictogram(s) |
Corrosion Corrosives GHS05 Exclamation Mark Irritant GHS07 |
GHS Hazard Statements |
H315:Skin corrosion/irritation H318:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation |
Precautionary Statement Codes |
P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P271:Use only outdoors or in a well-ventilated area. P280:Wear protective gloves/protective clothing/eye protection/face protection. P302+P352:IF ON SKIN: wash with plenty of soap and water. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. |
Computed Descriptors for 3,3-Dimethylacrylic acid
InChIKey | YYPNJNDODFVZLE-UHFFFAOYSA-N |
New Products
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