Trans-2-Methyl-2-butenal

trans-2-Methyl-2-butenal is an organic compound with the formula CH₃CH=C(CH₃)CHO. This colorless liquid is a building block in organic synthesis. It is an α,β-unsaturated aldehyde related to the better-known crotonaldehyde. The European rabbit, Oryctolagus cuniculus, uses 2-methyl-2-butenal as a pheromone.^[1] The rabbit pheromone, trans-2-methyl-2-butenal, was reported to be involved in the communication between species, defined under the class of "interomone."^[2]

trans-2-Methyl-2-butenal

Names
Preferred IUPAC name (2E)-2-Methylbut-2-enal
Other names (E)-2-Methylbut-2-enal trans-2-Methyl-2-butenal trans-2,3-Dimethylacrolein Tiglic aldehyde Tiglinaldehyde Tiglaldehyde
Identifiers
CAS Number	497-03-0 N
3D model (JSmol)	Interactive image
ChEMBL	ChEMBL53493 Y
ChemSpider	4479558 Y
ECHA InfoCard	100.007.122
PubChem CID	5321950
UNII	27ZVE2K81C Y
CompTox Dashboard (EPA)	DTXSID1049308
InChI InChI=1S/C5H8O/c1-3-5(2)4-6/h3-4H,1-2H3/b5-3+ Y Key: ACWQBUSCFPJUPN-HWKANZROSA-N Y InChI=1/C5H8O/c1-3-5(2)4-6/h3-4H,1-2H3/b5-3+ Key: ACWQBUSCFPJUPN-HWKANZROBA
SMILES O=C/C(=C/C)C
Properties
Chemical formula	C5H8O
Molar mass	84.12
Appearance	colorless liquid
Density	0.871
Melting point	−78 °C (−108 °F; 195 K)
Boiling point	116 to 119 °C (241 to 246 °F; 389 to 392 K) (752 mm Hg)
Hazards
Flash point	65 °C (149 °F; 338 K)
Related compounds
Related alkenals	Citral Citronellal Methacrolein
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references