3-Methyl-3-penten-2-one

3-Methyl-3-penten-2-one is an unsaturated aliphatic ketone. It is an isomer of mesityl oxide and isomesityl oxide. It is a precursor of 3-methyl-2-pentanone (methyl sec-butyl ketone) and is obtained by acid-catalyzed dehydration of 4-hydroxy-3-methyl-2-pentanone. It is used as an intermediate in organic chemistry syntheses.[1]

3-Methyl-3-penten-2-one
Structure formula of 3-methyl-3-penten-2-one
Names
Preferred IUPAC name
3-Methylpent-3-en-2-one
Identifiers
3D model (JSmol)
ChEMBL
ChemSpider
ECHA InfoCard 100.008.440
EC Number
  • 209-283-7
UNII
  • InChI=1S/C6H10O/c1-4-5(2)6(3)7/h4H,1-3H3/b5-4+
    Key: ZAMCMCQRTZKGDX-SNAWJCMRSA-N
  • C/C=C(\C)/C(=O)C
Properties
C6H10O
Molar mass 98.145 g·mol−1
Appearance Clear liquid
Density 0.875 g/cm3 (at 20 °C)
Hazards
GHS labelling:
GHS02: FlammableGHS06: ToxicGHS07: Exclamation mark
Danger
H226, H302, H312, H315, H319, H331, H332, H335
P210, P233, P240, P241, P242, P243, P261, P264, P270, P271, P280, P301+P312, P302+P352, P303+P361+P353, P304+P312, P304+P340, P305+P351+P338, P311, P312, P321, P322, P330, P332+P313, P337+P313, P362, P363, P370+P378, P403+P233, P403+P235, P405, P501
Flash point 34 °C (93 °F) (closed cup)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

References
  1. Hardo Siegel, Manfred Eggersdorfer (2007), "Ketones", Ullmann's Encyclopedia of Industrial Chemistry (7th ed.), Wiley, p. 5
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