trans-2-Heptenal Chemical Properties

Melting point:

-53.35°C (estimate)

Boiling point:

90-91 °C50 mm Hg(lit.)

Density 

0.857 g/mL at 25 °C(lit.)

vapor density 

>1 (vs air)

refractive index 

n20/D 1.450(lit.)

FEMA 

3165 | TRANS-2-HEPTENAL

Flash point:

128 °F

storage temp. 

2-8°C

form 

Liquid

color 

Colorless to Light yellow to Light orange

Odor

at 1.00 % in dipropylene glycol. pungent green vegetable fresh fatty

Odor Type

green

JECFA Number

1360

BRN 

1700822

LogP

2.11

CAS DataBase Reference

18829-55-5(CAS DataBase Reference)

NIST Chemistry Reference

2-Heptenal, (E)-(18829-55-5)

EPA Substance Registry System

2-Heptenal, (2E)- (18829-55-5)

Safety Information

Hazard Codes 

Xn,Xi

Risk Statements 

10-20/21-43

Safety Statements 

16-36/37

RIDADR 

UN 1988 3/PG 3

WGK Germany 

3

RTECS 

MJ8795000

F 

10-23

Hazard Note 

Irritant

HazardClass 

3.2

PackingGroup 

III

HS Code 

29121900

MSDS

• Language:English Provider:SigmaAldrich
• Language:English Provider:ACROS

trans-2-Heptenal Usage And Synthesis

Chemical Properties

clear colorless to light yellow liquid

Uses

trans-2-Heptenal is found in the scent-gland secretion of Oebalus pugnax (rice stink bug). trans-2-Heptenal is also an odour active compound found in guava.

Definition

ChEBI: (E)-hept-2-enal is a monounsaturated fatty aldehyde that is (2E)-hept-2-ene which is carrying an oxo group at position 1. Found in the peel of Malaysian pink and white pomelo peel and in the scent gland secretion of the rice stink bug Oebalus pugnax. It has a role as a plant metabolite and a uremic toxin. It is an enal, a monounsaturated fatty aldehyde and a medium-chain fatty aldehyde.

Synthesis Reference(s)

Journal of the American Chemical Society, 108, p. 452, 1986 DOI: 10.1021/ja00263a015
Tetrahedron Letters, 21, p. 3987, 1980 DOI: 10.1016/S0040-4039(00)92851-X

General Description

trans-2-Heptenal is a volatile flavor constituent identified in heated butter and tomato.

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