2-Nonenal

2-Nonenal is an unsaturated aldehyde. The colorless liquid is an important aroma component of aged beer^[2] and buckwheat, and is insoluble in water.^[3]

2-Nonenal

Names
Preferred IUPAC name Non-2-enal
Identifiers
CAS Number	18829-56-6 (trans) Y 60784-31-8 (cis) Y 2463-53-8 (cis/trans mixture) Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:142592
ChEMBL	ChEMBL450072 Y
ChemSpider	4446456 Y
ECHA InfoCard	100.017.784
EC Number	242-609-6 (trans) 219-562-5
PubChem CID	5283335
UNII	8VEO649985 (trans) Y ARM1W3309Z (cis) Y 93C6BZW2TV (cis/trans mixture) Y
CompTox Dashboard (EPA)	DTXSID3047219
InChI InChI=1S/C9H16O/c1-2-3-4-5-6-7-8-9-10/h7-9H,2-6H2,1H3/b8-7+ Y Key: BSAIUMLZVGUGKX-BQYQJAHWSA-N Y InChI=1/C9H16O/c1-2-3-4-5-6-7-8-9-10/h7-9H,2-6H2,1H3/b8-7+ Key: BSAIUMLZVGUGKX-BQYQJAHWBS
SMILES O=C/C=C/CCCCCC
Properties
Chemical formula	C9H16O
Molar mass	140.226 g·mol−1
Appearance	Colorless liquid
Boiling point	188.00 to 190.00 °C (370.40 to 374.00 °F; 461.15 to 463.15 K) at 760.00 mmHg
Hazards[1]
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315
Precautionary statements	P264, P280, P302+P352, P321, P332+P313, P362
NFPA 704 (fire diamond)	1 2 0
Flash point	79 °C (174 °F; 352 K)
Safety data sheet (SDS)	External MSDS
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

Odor characteristics

The odor of this substance is perceived as orris, fat and cucumber.^[4] Its odor has been associated with human body odor alterations during aging.^[5]