Methyl vinyl ketone
|Methyl vinyl ketone|
|Jmol-3D images||Image 1|
|Molar mass||70.09 g/mol|
|Melting point||−7 °C|
|Boiling point||81.4 °C|
|kH||2.1×101 Allen et al. 
4.4×101 Betterton 
4.1×101 Iraci et al. 
|Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)|
|(what is: / ?)|
Methyl vinyl ketone (MVK) (IUPAC name: Butenone) is the organic compound with the formula CH3C(O)CH=CH2. It is a reactive compound classified as an enone, in fact the simplest example thereof. It is a colorless, flammable, highly toxic liquid with a pungent odor. It is soluble in water and polar organic solvents. It is a useful intermediate in the synthesis of other compounds.
MVK has been prepared industrially by the condensation of acetone and formaldehyde, followed by dehydration. Similarly it is prepared by the Mannich reaction involving diethylammonium chloride and acetone, which produces the Mannich adduct:
- CH3C(O)CH3 + CH2O + [H2NEt2]Cl → [CH3C(O)CH2CH2N(H)Et2]Cl
Heating this ammonium salt releases the ammonium chloride and the MVK:
- [CH3C(O)CH2CH2N(H)Et2]Cl → [CH3C(O)CH=CH2 + [N(H)Et2]Cl
Reactivity and applications
Its alkylating ability is both the source of its high toxicity and the feature that makes it a useful intermediate in organic synthesis. MVK will polymerize spontaneously. The compound is typically stored with hydroquinone, which inhibits polymerization.
As an electrophilic alkene, it forms an adduct with cyclopentadiene. The resulting norbornene is an intermediate in the synthesis the pesticide Biperiden. Via its cyanohydrin is also a precursor to Vinclozolin. It is also a precursor to synthetic vitamin A.
MVK is extremely hazardous upon inhalation causing coughing, wheezing and shortness of breath even at low concentrations. It will also readily cause irritation of the skin, eyes, and mucous membranes.
- Merck Index, 11th Edition, 6052.
- Siegel, H.; Eggersdorfer, M. (2005), "Ketones", Ullmann's Encyclopedia of Industrial Chemistry, Weinheim: Wiley-VCH, doi:10.1002/14356007.a15_077