trans-Crotonaldehyde
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trans-Crotonaldehyde
structure -
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CAS No:
123-73-9
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Formula:
C4H6O
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Chemical Name:
trans-Crotonaldehyde
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Synonyms:
2-Butenal,(2E)-;Crotonaldehyde,(E)-;2-Butenal,(E)-;(2E)-2-Butenal;trans-2-Butenal;Topanel CA;trans-Crotonaldehyde;(E)-Crotonaldehyde;(E)-2-Butenal;trans-2-Buten-1-al;2(E)-Butenal;trans-Crotonal;(E)-But-2-en-1-al
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CAS No:
Description
Crotonaldehyde is water-white (turns paleyellow on contact with air) with an irritating, pungent, suffocating odor. The chemical can turn pale yellow when it contacts air. The chemical has a molecular weight of 70.1, a boiling point of 219°F, and a freezing point of -101°F. The vapor pressure is 30mm Hg at 25°C and the specific gravity is 0.87. The lower explosive limit is 2.1% and the upper explosive limit is 15.5%. Crotonaldehyde may be incompatible with caustics, ammonia, strong oxidizers, n
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.
Characteristics
17.1
0.63 (calculated)
Clear Liquid
0.869 g/cm3 @ Temp: 20 °C
-76 °C
104 °C
48 °F
n 20/D 1.437
H2O: 150 g/L (20 ºC)
2-8°C
32 mm Hg ( 20 °C)
2.41 (vs air)
Class IB Flammable Liquid: Fl.P. below 73°F and BP at or above 100°F.
19.5%
Pungent, suffocating odor
Safety Information
I
6.1
UN 1143 6.1/PG 1
3
11-24/25-26-37/38-41-48/22-50-68-R68-R50-R48/22-R41-R37/38-R26-R24/25-R11
26-28-36/37/39-45-61-28A-S61-S45-S36/37/39-S28A-S26-16
GP9625000
F,T+,N
Fireproof. Separated from food and feedstuffs and incompatible materials. See Chemical Dangers. Cool. Keep in the dark. Well closed. Store only if stabilized. Store in an area without drain or sewer access. Provision to contain effluent from fire extinguishing.
MAY DETERIORATE IN NORMAL STORAGE & CAUSE HAZARD.
P201-P210-P260-P280-P304 + P340 + P310-P370 + P378
H225-H301 + H311-H315-H318-H330-H335-H341-H373-H400
UN 1143
trans-Crotonaldehyde Use and Manufacturing
It is produced by liquid phase condensation of acetaldehyde under the catalysis of alkali or anion exchange resin to form butanal, which is obtained by heating condensation and dehydration in dilute acid. Each ton of crotonaldehyde consumes 1405kg of acetaldehyde, 4.7kg of sodium hydroxide and 4kg of aldehyde acid.
Crotonaldehyde (2-butenal, β-methyl acrolein, propylene aldehyde) is similar in structure to acrolein, as both are α,β-unsaturated aldehydes. This structural similarity leads to similar sensitizing and irritating properties of the two compounds. Crotonaldehyde is used industrially in the preparation of other chemicals (chiefly sorbic acid), flavoring agents, and can form endogenously and in the environment.
Crotonaldehyde is used in the manufacture ofbutyl alcohol, butyraldehyde, and in s
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