Citronellal

Citronellal or rhodinal (C₁₀H₁₈O) is a monoterpenoid aldehyde, the main component in the mixture of terpenoid chemical compounds that give citronella oil its distinctive lemon scent.

Citronellal^[1]

(+)-Citronellal
(-)-Citronellal
Names
IUPAC name 3,7-dimethyloct-6-enal
Identifiers
CAS Number	106-23-0 Y
3D model (JSmol)	Interactive image Interactive image
Beilstein Reference	1209447 1720789
ChEBI	CHEBI:47856 Y
ChEMBL	ChEMBL447944 Y
ChemSpider	7506 Y
ECHA InfoCard	100.003.070
EC Number	203-376-6
Gmelin Reference	1521962
KEGG	C17384 Y
PubChem CID	7794
UNII	QB99VZZ7GZ Y
CompTox Dashboard (EPA)	DTXSID3041790
InChI InChI=1S/C10H18O/c1-9(2)5-4-6-10(3)7-8-11/h5,8,10H,4,6-7H2,1-3H3 Y Key: NEHNMFOYXAPHSD-UHFFFAOYSA-N Y InChI=1/C10H18O/c1-9(2)5-4-6-10(3)7-8-11/h5,8,10H,4,6-7H2,1-3H3 Key: NEHNMFOYXAPHSD-UHFFFAOYAH
SMILES C/C(C)=C/CCC(C)CC=O O=CCC(CC/C=C(/C)C)C
Properties
Chemical formula	C10H18O
Molar mass	154.25 g/mol
Density	0.855 g/cm3
Boiling point	201 to 207 °C (394 to 405 °F; 474 to 480 K)
Hazards
GHS labelling:
Pictograms	[2]
Signal word	Warning
Hazard statements	H315, H317, H411[2]
Precautionary statements	P262, P273, P280, P302+P352[2]
Related compounds
Related alkenals	Citral Methacrolein trans-2-Methyl-2-butenal
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

Citronellal is a main isolate in distilled oils from the plants Cymbopogon (excepting C. citratus, culinary lemongrass),^[3] lemon-scented gum, and lemon-scented teatree. The (S)-(−)-enantiomer of citronellal makes up to 80% of the oil from kaffir lime leaves and is the compound responsible for its characteristic aroma.

Citronellal has insect repellent properties, and research shows high repellent effectiveness against mosquitoes.^[4] Another research shows that citronellal has strong antifungal qualities.^[5]