Crotonaldehyde
Names | |
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IUPAC name (2E)-but-2-enal | |
Other names Crotonaldehyde Crotoinic aldehyde β-Methacrolein β-Methyl acrolein 2-butenal Propylene aldehyde | |
Identifiers | |
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DrugBank |
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ECHA InfoCard | 100.021.846 |
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UN number | 1143 |
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InChI
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Properties | |
Chemical formula | C4H6O |
Molar mass | 70.091 g·mol−1 |
Appearance | colourless liquid |
Odor | pungent, suffocating odor |
Density | 0.846 g/cm3 |
Melting point | −76.5 °C (−105.7 °F; 196.7 K) |
Boiling point | 104.0 °C (219.2 °F; 377.1 K) |
18% (20°C)[2] | |
Solubility | very soluble in ethanol, ethyl ether, acetone soluble in chloroform miscible in benzene |
Vapor pressure | 19 mmHg (20°C)[2] |
Refractive index (nD) | 1.4362 |
Hazards | |
GHS labelling: | |
Danger | |
H225, H301, H310, H311, H315, H318, H330, H335, H341, H373, H400 | |
P201, P202, P210, P233, P240, P241, P242, P243, P260, P261, P262, P264, P270, P271, P273, P280, P281, P284, P301+P310, P302+P350, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P308+P313, P310, P312, P314, P320, P321, P322, P330, P332+P313, P361, P362, P363, P370+P378, P391, P403+P233, P403+P235, P405, P501 | |
NFPA 704 (fire diamond) | 4 3 2 |
Flash point | 13 °C (55 °F; 286 K) |
Autoignition temperature | 207 °C (405 °F; 480 K) |
Explosive limits | 2.1-15.5% |
Lethal dose or concentration (LD, LC): | |
LC50 (median concentration) | 600 ppm (rat, 30 min) 1375 ppm (rat, 30 min) 519 ppm (mouse, 2 hr) 1500 ppm (rat, 30 min)[3] |
LCLo (lowest published) | 400 ppm (rat, 1 hr)[3] |
NIOSH (US health exposure limits): | |
PEL (Permissible) | TWA 2 ppm (6 mg/m3)[2] |
REL (Recommended) | TWA 2 ppm (6 mg/m3)[2] |
IDLH (Immediate danger) | 50 ppm[2] |
Related compounds | |
Related alkenals | Acrolein cis-3-hexenal |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references |
Crotonaldehyde is a chemical compound with the formula CH3CH=CHCHO. The compound is usually sold as a mixture of the E- and Z-isomers, which differ with respect to the relative position of the methyl and formyl groups. The E-isomer is more common (data given in Table is for the E-isomer). This lachrymatory liquid is moderately soluble in water and miscible in organic solvents. As an unsaturated aldehyde, crotonaldehyde is a versatile intermediate in organic synthesis. It occurs in a variety of foodstuffs, e.g. soybean oils.[4]
Production and reactivity
Crotonaldehyde is produced by the aldol condensation of acetaldehyde:
- 2 CH3CHO → CH3CH=CHCHO + H2O
Crotonaldehyde is a multifunctional molecule that exhibits diverse reactivity. It is a prochiral dienophile.[5] It is a Michael acceptor. Addition of methylmagnesium chloride produces 3-penten-2-ol.[6]
Polyurethane catalyst N,N,N′,N′-tetramethyl-1,4-butanediamine (also known as NIAX TMBDA) was obtained by hydrogenating the reaction product of crotonaldehyde and dimethylamine.[7]
Uses
It is a precursor to fine chemicals. Sorbic acid, a food preservative, and trimethylhydroquinone, a precursor to the vitamin E, are prepared from crotonaldehyde. Other derivatives include crotonic acid and 3-methoxybutanol. It adds two equivalents of urea to give the pyrimidine derivative that is employed as a controlled-release fertilizer. [4]
Safety
Crotonaldehyde is a potent irritant even at the ppm levels. It is not very toxic, with an LD50 of 174 mg/kg (rats, oral).[4]
See also
References
- ^ Merck Index, 11th Edition, 2599
- ^ a b c d e NIOSH Pocket Guide to Chemical Hazards. "#0157". National Institute for Occupational Safety and Health (NIOSH).
- ^ a b "Crotonaldehyde". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
- ^ a b c R. P. Schulz; J. Blumenstein; C. Kohlpaintner (2005). "Crotonaldehyde and Crotonic Acid". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a08_083. ISBN 978-3527306732.
- ^ Longley Jr., R. I..; Emerson, W. S.; Blardinelli, A. J. (1954). "3,4-Dihydro-2-methoxy-4-methyl-2H-pyran". Org. Synth. 34: 29. doi:10.15227/orgsyn.034.0029.
- ^ Coburn, E. R. (1947). "3-Penten-2-ol". Org. Synth. 27: 65. doi:10.15227/orgsyn.027.0065.
- ^ "Catalysts". 8 January 2011.
- ^ Dittmar, Heinrich; Drach, Manfred; Vosskamp, Ralf; Trenkel, Martin E.; Gutser, Reinhold; Steffens, Günter (2009). "Fertilizers, 2. Types". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.n10_n01. ISBN 978-3527306732.
External links
- Hazardous Substance Fact Sheet
- CDC - NIOSH Pocket Guide to Chemical Hazards
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