cis -rotonaldehyde
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| General | |||||||||||||
| Surname | Cis crotonaldehyde | ||||||||||||
| other names |
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| Molecular formula | C 4 H 6 O | ||||||||||||
| Brief description |
colorless liquid |
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| properties | |||||||||||||
| Molar mass | 70.09 g mol −1 | ||||||||||||
| Physical state |
liquid |
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| density |
0.8477 g cm −3 |
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| Melting point |
−69 ° C |
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| boiling point |
104 ° C |
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| Vapor pressure |
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| solubility |
easily soluble in water (181 g l −1 ) |
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| safety instructions | |||||||||||||
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| MAK |
DFG : no classification, as a carcinogenic effect is suspected |
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| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . | |||||||||||||
cis -Crotonaldehyde is an organic chemical compound from the group of unsaturated aldehydes . It is a structural isomer of crotonaldehyde ; there is also the technically far more important trans- protonaldehyde .
Occurrence
In nature, cis -crotonaldehyde occurs mainly in croton oil , which is obtained from the plants of the genus Croton .
properties
Physical Properties
cis -rotonaldehyde has a relative gas density of 2.42 (density ratio to dry air at the same temperature and pressure ) and a density of 0.8477 g · cm −3 . In addition, ( Z ) -but-2-enal has a vapor pressure of 24 hPa at 20 ° C, 37 hPa at 30 ° C and 165 hPa at 50 ° C.
Chemical properties
cis -Crotonaldehyde is an easily flammable, colorless liquid from the group of unsaturated aldehydes . The substance is easily soluble in water and is also classified as hazardous to the aquatic environment. In addition, cis -rotonaldehyde is highly volatile. Reactions with alkalis , acids or 1,3-butadiene can lead to the formation of explosive mixtures. In addition, the substance can react dangerously with oxidizing agents to form other products. (Z) -But-2-enal is the cis structural isomer which, together with the far more important trans -rotonaldehyde, forms the group of crotonaldehydes .
use
The structural isomer cis -rotonaldehyde is less used in the chemical industry due to its thermodynamic instability. It can be oxidized to cis -rotonic acid ( isocrotonic acid ) with oxidizing agents, whereas the reduction yields cis- rotyl alcohol.
safety instructions
The liquid and vapors of cis -rotonaldehyde are highly flammable. The substance is toxic if it comes into contact with the skin or if swallowed, if inhaled it is fatal. Ingestion or ingestion can cause severe irritation to the respiratory tract , skin and eyes . In addition, the organs are permanently damaged. cis- Protonaldehyde can presumably cause genetic defects. The compound has a lower explosion limit (LEL) of about 2.10% by volume (60 g / cm 3 ) and an upper explosion limit (UEL) of about 15.5% by volume (450 g / cm 3 ). The ignition temperature is 230 ° C. The substance therefore falls into temperature class T3 and explosion group IIB. With a flash point of 8 ° C, cis -rotonaldehyde is considered to be relatively easily flammable.
