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2,3-Epoxybutane

Names
Preferred IUPAC name 2,3-Dimethyloxirane
Other names 2,3-Butyleneoxide, 2,3-Buteneoxide
Identifiers
CAS Number	3266-23-7 meso or cis: 1758-33-4 S,S: 21490-63-1 R,R: 1758-32-3
3D model (JSmol)	Interactive image meso or cis: Interactive image S,S: Interactive image R,R: Interactive image
ChemSpider	17595 meso or cis: 83206 S,S: 28456 R,R: 4937496
ECHA InfoCard	100.019.889
EC Number	221-877-8 meso or cis: 244-406-8 R,R: 244-406-8
PubChem CID	18632 meso or cis: 92162 S,S: 30664 R,R: 6432237
UN number	3271
CompTox Dashboard (EPA)	DTXSID5025239
InChI InChI=1S/C4H8O/c1-3-4(2)5-3/h3-4H,1-2H3Key: PQXKWPLDPFFDJP-UHFFFAOYSA-N meso or cis: InChI=1S/C4H8O/c1-3-4(2)5-3/h3-4H,1-2H3/t3-,4+Key: PQXKWPLDPFFDJP-ZXZARUISSA-N S,S: InChI=1S/C4H8O/c1-3-4(2)5-3/h3-4H,1-2H3/t3-,4-/m0/s1Key: PQXKWPLDPFFDJP-IMJSIDKUSA-N R,R: InChI=1S/C4H8O/c1-3-4(2)5-3/h3-4H,1-2H3/t3-,4-/m1/s1Key: PQXKWPLDPFFDJP-QWWZWVQMSA-N
SMILES CC1C(O1)C meso or cis: C1(O1)C S,S: C1(O1)C R,R: C1(O1)C
Properties
Chemical formula	C4H8O
Molar mass	72.107 g·mol
Appearance	colorless liquid
Density	0.837 g·cm
Boiling point	64–78 °C (147–172 °F; 337–351 K)
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H225, H315, H319, H335, H341
Precautionary statements	P203, P210, P233, P240, P241, P242, P243, P261, P264, P264+P265, P271, P280, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P318, P319, P321, P332+P317, P337+P317, P362+P364, P370+P378, P403+P233, P403+P235, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references

2,3-Epoxybutane is an organic compound with the formula CH₃CH(O)CHCH₃. It is an epoxide. The compound exists as three stereoisomers, a pair of enantiomers and the meso isomer. All are colorless liquids.

Preparation and reactions

2,3-Epoxybutane is prepared from 2-butene via the chlorohydrin:

CH₃CH=CHCH₃ + HOCl → CH₃CH(OH)CH(Cl)CH₃

CH₃CH(OH)CH(Cl)CH₃ → CH₃CH(O)CHCH₃ + HCl

A common reaction is its hydration to 2,3-butanediol. Many such ring-opening reactions have been reported.

References

1. Heinz Gräfje, Wolfgang Körnig, Hans-Martin Weitz, Wolfgang Reiß, Guido Steffan, Herbert Diehl, Horst Bosche, Kurt Schneider and Heinz Kieczka "Butanediols, Butenediol, and Butynediol" in Ullmann's Encyclopedia of Industrial Chemistry, 2019, Wiley-VCH, Weinheim. doi:10.1002/14356007.a04_455.pub2
2. Nugent, William A. (1998). "Desymmetrization of Meso Epoxides with Halides: A New Catalytic Reaction Based on Mechanistic Insight". Journal of the American Chemical Society. 120 (28): 7139–7140. Bibcode:1998JAChS.120.7139N. doi:10.1021/JA981031L.

• Epoxides