Propionaldehyde

Propionaldehyde
Skeletal formula of propionaldehyde (propanal)	Flat structure
Names
	IUPAC name Propanal
	Systematic IUPAC name Propanal
	Other names Methylacetaldehyde; Propionic aldehyde; Propaldehyde;
Identifiers
CAS Number	123-38-6 ;
3D model (JSmol)	Interactive image;
3DMet	B01258;
ChEBI	CHEBI:17153 ;
ChEMBL	ChEMBL275626 ;
ChemSpider	512 ;
ECHA InfoCard	100.004.204
EC Number	204-623-0;
KEGG	C00479;
PubChem CID	527;
RTECS number	UE0350000;
UNII	AMJ2B4M67V ;
UN number	1275
CompTox Dashboard (EPA)	DTXSID2021658 ;
	InChI InChI=1S/C3H6O/c1-2-3-4/h3H,2H2,1H3 Key: NBBJYMSMWIIQGU-UHFFFAOYSA-N ; InChI=1/C3H6O/c1-2-3-4/h3H,2H2,1H3 Key: NBBJYMSMWIIQGU-UHFFFAOYAZ;
	SMILES CCC=O;
Properties
Chemical formula	C3H6O
Molar mass	58.080 g·mol−1
Appearance	Colourless liquid;
Odor	Pungent, fruity
Density	0.81 g cm−3
Melting point	−81 °C (−114 °F; 192 K)
Boiling point	46 to 50 °C (115 to 122 °F; 319 to 323 K)
Solubility in water	20 g/100 mL
Magnetic susceptibility (χ)	-34.32·10−6 cm3/mol
Viscosity	0.6 cP at 20 °C
Structure
Molecular shape	C1, O: sp2 C2, C3: sp3
Dipole moment	2.52 D
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H225, H302, H315, H318, H332, H335
Precautionary statements	P210, P261, P280, P304+P340+P312, P305+P351+P338, P310, P403+P235
NFPA 704 (fire diamond)	2 3 2
Flash point	−26 °C (−15 °F; 247 K)
Autoignition; temperature	175 °C (347 °F; 448 K)
Related compounds
Related aldehydes	Acetaldehyde; Butyraldehyde
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Propionaldehyde or propanal is the organic compound with the formula CH₃CH₂CHO. It is the 3-carbon aldehyde. It is a colourless, flammable liquid with a slightly fruity odour. It is produced on a large scale industrially.

Production

Propionaldehyde is mainly produced industrially by hydroformylation of ethylene:

CO + H₂ + C₂H₄ → CH₃CH₂CHO

In this way, several hundred thousand tons are produced annually.^[2]

Laboratory preparation

Propionaldehyde may also be prepared by oxidizing 1-propanol with a mixture of sulfuric acid and potassium dichromate. The reflux condenser contains water heated at 60 °C, which condenses unreacted propanol, but allows propionaldehyde to pass. The propionaldehyde vapor is immediately condensed into a suitable receiver. In this arrangement, any propionaldehyde formed is immediately removed from the reactor, thus it does not get over-oxidized to propionic acid.^[3]

Uses

Its predominantly used as a precursor to trimethylolethane (CH₃C(CH₂OH)₃) through a condensation reaction with formaldehyde. This triol is an important intermediate in the production of alkyd resins. It is used in the synthesis of several common aroma compounds (cyclamen aldehyde, helional, lilial). Other applications include reduction to propanol and oxidation to propionic acid.^[2]

Laboratory uses

Propionaldehyde is a common reagent, being a building block to many compounds.^[4] Many of these uses exploit its participation in condensation reactions.^[5] With tert-butylamine it gives CH₃CH₂CH=N-t-Bu, a three-carbon building block used in organic synthesis.^[6]

Extraterrestrial occurrence

Propionaldehyde along with acrolein has been detected in the molecular cloud Sagittarius B2 near the center of the Milky Way Galaxy, about 26,000 light years from Earth.^[7]^[8]^[9]

Measurements by the COSAC and Ptolemy instruments on comet 67/P's surface, revealed sixteen organic compounds, four of which were seen for the first time on a comet, including acetamide, acetone, methyl isocyanate and propionaldehyde.^[10]^[11]^[12]

Safety

With an LD50 of 1690 mg/kg (oral),^[2] propionaldehyde exhibits low acute toxicity.

References

^ ^a ^b Record of Propanal in the GESTIS Substance Database of the Institute for Occupational Safety and Health, accessed on 22 March 2020.
^ ^a ^b ^c Hensel, A. (2018). "Propanal". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a22_157.pub3. ISBN 978-3527306732.
^ Hurd, Charles D.; Meinert, R. N. (1932). "Propionaldehyde". Organic Syntheses. 12: 64. doi:10.15227/orgsyn.012.0064.
^ Wehrli, Pius A.; Chu, Vera (1978). "Y-Ketoesters from Aldehydes Via Diethyl Acylsuccinates: Ethyl 4-Oxohexanoate". Organic Syntheses. 58: 79. doi:10.15227/orgsyn.058.0079.
^ Sessler, Jonathan L.; Mozaffari, Azadeh; Johnson, Martin R. (1992). "3,4-Diethylpyrrole and 2,3,7,8,12,13,17,18-Octaethylporphyrin". Org. Synth. 70: 68. doi:10.15227/orgsyn.070.0068.
^ Peralta, M. M. "Propionaldehyde t-Butylimine" in Encyclopedia of Reagents for Organic Synthesis (Ed: L. Paquette) 2004, J. Wiley & Sons, New York. doi:10.1002/047084289X.
^ Scientists Discover Two New Interstellar Molecules: Point to Probable Pathways for Chemical Evolution in Space, National Radio Astronomy Observatory, June 21, 2004
^ Two newly found space molecules. By: Goho, Alexandra, Science News, 00368423, 7/24/2004, Vol. 166, Issue 4
^ Chemical Precursors to Life Found in Space Scientists say that a universal prebiotic chemistry may be at work
^ Jordans, Frank (30 July 2015). "Philae probe finds evidence that comets can be cosmic labs". The Washington Post. Associated Press. Retrieved 30 July 2015.
^ "Science on the Surface of a Comet". European Space Agency. 30 July 2015. Retrieved 30 July 2015.
^ Bibring, J.-P.; Taylor, M.G.G.T.; Alexander, C.; Auster, U.; Biele, J.; Finzi, A. Ercoli; Goesmann, F.; Klingehoefer, G.; Kofman, W.; Mottola, S.; Seidenstiker, K.J.; Spohn, T.; Wright, I. (31 July 2015). "Philae's First Days on the Comet - Introduction to Special Issue". Science. 349 (6247): 493. Bibcode:2015Sci...349..493B. doi:10.1126/science.aac5116. PMID 26228139.

[GESTIS-1] Record of Propanal in the GESTIS Substance Database of the Institute for Occupational Safety and Health, accessed on 22 March 2020.

[Ullmann-2] Hensel, A. (2018). "Propanal". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a22_157.pub3. ISBN 978-3527306732.

[3] Hurd, Charles D.; Meinert, R. N. (1932). "Propionaldehyde". Organic Syntheses. 12: 64. doi:10.15227/orgsyn.012.0064.

[4] Wehrli, Pius A.; Chu, Vera (1978). "Y-Ketoesters from Aldehydes Via Diethyl Acylsuccinates: Ethyl 4-Oxohexanoate". Organic Syntheses. 58: 79. doi:10.15227/orgsyn.058.0079.

[5] Sessler, Jonathan L.; Mozaffari, Azadeh; Johnson, Martin R. (1992). "3,4-Diethylpyrrole and 2,3,7,8,12,13,17,18-Octaethylporphyrin". Org. Synth. 70: 68. doi:10.15227/orgsyn.070.0068.

[6] Peralta, M. M. "Propionaldehyde t-Butylimine" in Encyclopedia of Reagents for Organic Synthesis (Ed: L. Paquette) 2004, J. Wiley & Sons, New York. doi:10.1002/047084289X.

[7] Scientists Discover Two New Interstellar Molecules: Point to Probable Pathways for Chemical Evolution in Space, National Radio Astronomy Observatory, June 21, 2004

[8] Two newly found space molecules. By: Goho, Alexandra, Science News, 00368423, 7/24/2004, Vol. 166, Issue 4

[9] Chemical Precursors to Life Found in Space Scientists say that a universal prebiotic chemistry may be at work

[wapo20150730-10] Jordans, Frank (30 July 2015). "Philae probe finds evidence that comets can be cosmic labs". The Washington Post. Associated Press. Retrieved 30 July 2015.

[esa20150730-11] "Science on the Surface of a Comet". European Space Agency. 30 July 2015. Retrieved 30 July 2015.

[SCI-20150731-12] Bibring, J.-P.; Taylor, M.G.G.T.; Alexander, C.; Auster, U.; Biele, J.; Finzi, A. Ercoli; Goesmann, F.; Klingehoefer, G.; Kofman, W.; Mottola, S.; Seidenstiker, K.J.; Spohn, T.; Wright, I. (31 July 2015). "Philae's First Days on the Comet - Introduction to Special Issue". Science. 349 (6247): 493. Bibcode:2015Sci...349..493B. doi:10.1126/science.aac5116. PMID 26228139.

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