1,1-Dimethoxy-3,7-dimethylocta-2,6-diene

Synonym(s):3,7-Dimethyl-2,6-octadienal dimethyl acetal

CAS NO.：7549-37-3
Empirical Formula: C12H22O2
Molecular Weight: 198.3
MDL number: MFCD00008909
EINECS: 231-434-0
SAFETY DATA SHEET (SDS)
Update Date: 2026-01-13 11:27:04

1,1-Dimethoxy-3,7-dimethylocta-2,6-diene Structural

What is 1,1-Dimethoxy-3,7-dimethylocta-2,6-diene?

Description

Citral dimethyl acetal is a colorless liquid. Sp.Gr. 0.89. B.P. slightly lower than that of Citral. Almost insoluble in water, soluble in alcohol and oils.

Chemical properties

Citral dimethyl acetal has a fresh, lemon-like odor. The commercial product consists of a mixture of cis- and trans-isomers.

Occurrence

Apparently has not been reported to occur in nature.

The Uses of 1,1-Dimethoxy-3,7-dimethylocta-2,6-diene

Citral dimethyl acetal is used in perfume compositions partly as a mild-green topnote in soap fragrances, and also as a topnote modifier in delicate floral fragrances, green-citrusy types, fresh notes, etc. Used in flavor compositions mainly in Citrus types and generally in fruit flavors to introduce a natural freshness similar to that of unripe fruit or green Lemon peel, Apple peel, etc.

Definition

ChEBI: A monoterpenoid that is the acetal obtained by formal condensation of citral with methanol.

Preparation

From citral and methyl alcohol in the presence of a catalyst, or by reacting citral with trimethyl orthoformate.

Taste threshold values

Taste characteristics at 10 ppm: green, citrus, lemon, grapefruit, lime with woody and terpy nuance.

Properties of 1,1-Dimethoxy-3,7-dimethylocta-2,6-diene

Boiling point:	105-106 °C10 mm Hg(lit.)
Density	0.89 g/mL at 25 °C(lit.)
vapor density	6.8 (vs air)
vapor pressure	9 mm Hg ( 102.7 °C)
FEMA	2305 \| CITRAL DIMETHYL ACETAL
refractive index	n20/D 1.454(lit.)
Flash point:	180 °F
form	clear liquid
color	Colorless to Almost colorless
Odor	at 100.00 %. green floral citric lemon lime natural
Water Solubility	Almost insoluble in water
JECFA Number	944
CAS DataBase Reference	7549-37-3(CAS DataBase Reference)
NIST Chemistry Reference	3,7-Dimethyl-2,6-octadienal, dimethyl acetal(7549-37-3)
EPA Substance Registry System	2,6-Octadiene, 1,1-dimethoxy-3,7-dimethyl- (7549-37-3)

Safety information for 1,1-Dimethoxy-3,7-dimethylocta-2,6-diene

Signal word	Warning
Pictogram(s)	Exclamation Mark Irritant GHS07
GHS Hazard Statements	H227:Flammable liquids H315:Skin corrosion/irritation H317:Sensitisation, Skin H319:Serious eye damage/eye irritation
Precautionary Statement Codes	P210:Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P272:Contaminated work clothing should not be allowed out of the workplace. P280:Wear protective gloves/protective clothing/eye protection/face protection. P370+P378:In case of fire: Use … for extinction. P403+P235:Store in a well-ventilated place. Keep cool. P501:Dispose of contents/container to..…