Ethyl 2-trans-4-cis-decadienoate Property

Melting point:

-60 °C

Boiling point:

70-72 °C0.05 mm Hg(lit.)

Density 

0.905 g/mL at 25 °C(lit.)

vapor pressure 

1.6hPa at 21.1℃

refractive index 

n20/D 1.486(lit.)

FEMA 

3148 | ETHYL TRANS-2,CIS-4-DECADIENOATE

Flash point:

>230 °F

storage temp. 

2-8°C

solubility 

Chloroform (Slightly), Methanol (Slightly)

color 

Colourless

Odor

at 10.00 % in dipropylene glycol. green waxy pear apple sweet fruity tropical

Odor Type

green

JECFA Number

1192

BRN 

1724176

LogP

4.1-4.7 at 35℃ and pH7

EPA Substance Registry System

2,4-Decadienoic acid, ethyl ester, (2E,4Z)- (3025-30-7)

Safety

Hazard Codes 

Xi,N

Risk Statements 

38-50/53

Safety Statements 

24/25-61-60

RIDADR 

UN 3082 9/PG 3

WGK Germany 

1

RTECS 

HD3510900

F 

10-23

HS Code 

29161995

Toxicity

LD50 oral in rat: > 5gm/kg

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H315Causes skin irritation

H412Harmful to aquatic life with long lasting effects

Precautionary statements

P273Avoid release to the environment.

P302+P352IF ON SKIN: wash with plenty of soap and water.

Ethyl 2-trans-4-cis-decadienoate Chemical Properties,Usage,Production

Chemical Properties

clear colorless to yellowish liquid

Chemical Properties

Ethyl-trans-2, cis-4-decadienoate has a characteristic pear-like flavor and a light fruity aroma.

Chemical Properties

Ethyl (2E,4Z)-2,4-Decadienoate (Ethyl 2-trans-4-cis-decadienoate) has been identified in pears and has the typical aroma of Williams pears. Synthesis of ethyl (2E,4Z)-2,4-decadienoate starts from (Z)-1-heptenyl bromide, which is converted into a 1-heptenyllithium cuprate complex with lithium and copper iodide. Reaction with ethyl propiolate yields a mixture of 95% ethyl (2E,4Z)- and 5% ethyl (2E,4E)-2,4-decadienoate. Pure ethyl (2E,4Z)-2,4-decadienoate is obtained by fractional distillation. A biotechnological process for its preparation has been developed.

Occurrence

Reported found in Bartlett pears, apple, grape, durian (Durio zibethinus), pear brandy, quince and spineless monkey orange (Strychnos madagasc).

Uses

The potential applications of Ethyl 2-trans-4-cis-decadienoate include the profile enhancement of guava, melon, pear, apple, banana, kiwi, grape, golden delicious apple, fruit cocktail juices, fruit nectar, mamey and other tropical backgrounds.
Ethyl 2-trans-4-cis-decadienoate (DDSE) is a flavoring that is largely responsible for the aroma of Williams pears is responsible.

Definition

Ethyl (2E,4Z)-deca-2,4-dienoate (Ethyl 2-trans-4-cis-decadienoate) is a fatty acid ethyl ester resulting from the formal condensation of the carboxy group of (2E,4E)-deca-2,4-dienoic acid with the hydroxy group of ethanol. It has a role as a plant metabolite, a flavouring agent, a fragrance and a kairomone. It is a natural product found in Euglena gracilis.

Production Methods

Stillingia oil is one of the fruits of the tallow tree native to China (Stillingia sebifera or Sapium sepiferum, Euphorbiaceae) vegetable fat. It contains about 5% of DDS in the form of glycerides by weight. Ethyl 2-trans-4-cis-decadienoate (DDSE) can be obtained from this by base-catalyzed transesterification with ethanol; however, in food law, this is not a natural process, so the product obtained cannot be called a natural flavouring.
A mixture of Stillingia oil (5 kg), natural ethanol (1.0 kg) and Novozym 435 (1.0 kg) was overlaid with nitrogen in a 20-liter glass vessel at 45 ° C and slowly stirred. The vessel was fitted with a water cooler to prevent losses and minimize evaporation. The approach was cancelled after an incubation period of 2 to 3 each Day. The filtered enzyme was added with fresh Stillingia oil and natural ethanol, and stirring was continued. All 10 cycles were performed, the content of Ethyl 2-trans-4-cis-decadienoate from the individual filtrates varied between 4.0 and 4.7% by weight.

Aroma threshold values

Detection: 100 ppb. Aroma characteristics at 1.0%: sweet ripe pear, creamy and slightly fatty with fruity, green, waxy apple, fleshy nuances

Taste threshold values

Taste characteristics at 5 ppm: ripe pear, green fruity, waxy apple, tropical notes, fatty golden delicious apple fleshy. Taste characteristics at 20 ppm: green, fruity, apple and pear with waxy tropical nuances.

Synthesis Reference(s)

Tetrahedron, 36, p. 1961, 1980 DOI: 10.1016/0040-4020(80)80209-2

General Description

Natural occurrence: Apple, pear, grape, pear brandy and quince.

Biochem/physiol Actions

Odor at 1.0%

Synthesis

Synthetically via the lithium vinyl cuprates.