2-Nonenal

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
ChemSpider	4446456 Y
ECHA InfoCard	100.038.720
PubChem CID	5283335
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	140.23 g·mol−1
Appearance	Colorless liquid
Boiling point	55 to 60 °C (131 to 140 °F; 328 to 333 K) at 0.30 mmHg
Hazards
Safety data sheet	External MSDS
EU classification (DSD) (outdated)	Irritant (XI)
R-phrases (outdated)	R38
S-phrases (outdated)	S24/25 S37 S45 S28
NFPA 704	2 1 0
Flash point	79 °C (174 °F; 352 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y  (what is YN ?)
Infobox references

2-Nonenal (sometimes misspelled as noneal) is an unsaturated aldehyde. The colorless liquid is an important aroma component of aged beer and buckwheat.

The odor of this substance is perceived as orris, fat and cucumber. Its odor has been associated with human body odor alterations during aging (a.k.a. old person smell).