1,2-Epoxybutane

{{Chembox

| ImageFile = Structural formula of 1,2-epoxybutane.svg

| ImageSize =

| ImageAlt =

| PIN = Ethyloxirane

| OtherNames = 1,2-Butyleneoxide
1,2-Buteneoxide
Ethyloxyrane

|Section1={{Chembox Identifiers

| index1_label = (R)

| index2_label = (S)

| CASNo = 106-88-7

| CASNo_Ref = {{cascite|correct|CAS}}

| CASNo1 = 3760-95-0

| CASNo2 = 30608-62-9

| UNII_Ref = {{fdacite|correct|FDA}}

| UNII = FR67H5388O

| PubChem = 7834

| PubChem1 = 11147670

| PubChem2 = 10898629

| ChemSpiderID = 7546

| ChemSpiderID1 = 9322778

| ChemSpiderID2 = 9073889

| EC_number = 203-438-2

| RTECS = EK3675000

| UNNumber = 3022

| StdInChI=1S/C4H8O/c1-2-4-3-5-4/h4H,2-3H2,1H3

| StdInChIKey = RBACIKXCRWGCBB-UHFFFAOYSA-N

| InChI1 = 1S/C4H8O/c1-2-4-3-5-4/h4H,2-3H2,1H3/t4-/m1/s1

| InChIKey1 = RBACIKXCRWGCBB-SCSAIBSYSA-N

| InChI2 = 1S/C4H8O/c1-2-4-3-5-4/h4H,2-3H2,1H3/t4-/m0/s1

| InChIKey2 = RBACIKXCRWGCBB-BYPYZUCNSA-N

| SMILES = CCC1CO1

| SMILES1 = CC[C@@H]1CO1

| SMILES2 = CC[C@H]1CO1

| Jmol1 = none

| Jmol2 = none

}}

|Section2={{Chembox Properties

| C=4|H=8|O=1

| MolarMass =

| Appearance = colorless liquid

| Density = 0.83 g·cm{{sup|−3}}

| MeltingPtC = −150

| BoilingPtC = 65

| Viscosity = 0.40 mPa.s

| Solubility = }}

|Section3={{Chembox Hazards

| GHSPictograms = {{GHS02}}{{GHS07}}{{GHS08}}

| GHSSignalWord = Danger

| HPhrases = {{H-phrases|225|302|312|315|319|332|335|351|412}}

| PPhrases = {{P-phrases|201|202|210|233|240|241|242|243|261|264|270|271|273|280|281|301+312|302+352|303+361+353|304+312|304+340|305+351+338|308+313|312|321|322|330|332+313|337+313|362|363|370+378|403+233|403+235|405|501}}

| MainHazards =

| FlashPtC = −22

| AutoignitionPt = }}

}}

1,2-Epoxybutane is an organic compound with the formula CH{{sub|2}}(O)CHCH{{sub|2}}CH{{sub|3}}. It is a chiral epoxide prepared by oxidation of 1-butene.{{cite journal|title=Efficient Epoxidation of Olefins with ≥99% Selectivity and Use of Hydrogen Peroxide|author1=Kamata, Keigo |author2=Yonehara, Koji |author3=Sumida, Yasutaka |author4=Yamaguchi, Kazuya |author5=Hikichi, Shiro |author6=Mizuno, Noritaka

|journal=Science|year=2003|volume=300|issue=5621 |pages=964–966|doi=10.1126/science.1083176|pmid=12738860 |bibcode=2003Sci...300..964K |s2cid=38700647 }}