Rose oxide

Chemical compound From Wikipedia, the free encyclopedia

Rose oxide[1] is a fragrance chemical found in roses and rose oil. It also contributes to the flavor of some fruits, such as lychee, and wines, such as Gewürztraminer.

Quick facts Names, Identifiers ...
Rose oxide
Names
IUPAC name
Tetrahydro-4-methyl-2-(2-methylpropenyl)-2H-pyran
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.036.763 Edit this at Wikidata
EC Number
  • 240-457-5
UNII
  • InChI=1S/C10H18O/c1-8(2)6-10-7-9(3)4-5-11-10/h6,9-10H,4-5,7H2,1-3H3
    Key: CZCBTSFUTPZVKJ-UHFFFAOYSA-N
  • (−)-cis: InChI=1S/C10H18O/c1-8(2)6-10-7-9(3)4-5-11-10/h6,9-10H,4-5,7H2,1-3H3/t9-,10-/m1/s1
    Key: CZCBTSFUTPZVKJ-NXEZZACHSA-N
  • (−)-trans: InChI=1S/C10H18O/c1-8(2)6-10-7-9(3)4-5-11-10/h6,9-10H,4-5,7H2,1-3H3/t9-,10+/m1/s1
    Key: CZCBTSFUTPZVKJ-ZJUUUORDSA-N
  • (+)-cis: InChI=1S/C10H18O/c1-8(2)6-10-7-9(3)4-5-11-10/h6,9-10H,4-5,7H2,1-3H3/t9-,10-/m0/s1
    Key: CZCBTSFUTPZVKJ-UWVGGRQHSA-N
  • (+)-trans: InChI=1S/C10H18O/c1-8(2)6-10-7-9(3)4-5-11-10/h6,9-10H,4-5,7H2,1-3H3/t9-,10+/m0/s1
    Key: CZCBTSFUTPZVKJ-VHSXEESVSA-N
  • CC1CCOC(C1)C=C(C)C
  • (−)-cis: C[C@@H]1CCO[C@@H](C1)C=C(C)C
  • (−)-trans: C[C@@H]1CCO[C@H](C1)C=C(C)C
  • (+)-cis: C[C@H]1CCO[C@H](C1)C=C(C)C
  • (+)-trans: C[C@H]1CCO[C@@H](C1)C=C(C)C
Properties
C10H18O
Molar mass 154.25 g/mol
Density 0.875 g/cm3
Boiling point 230 °C (446 °F; 503 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Chemistry

Rose oxide is an organic compound of the pyran class of monoterpenes. The compound has a cis- and a trans-isomer, each with a (+)- and (−)-stereoisomer, but only the (−)-cis isomer (odor threshold 0.5 ppb) is responsible for the typical rose (floral green) fragrance.[2]

Rose oxide isomers

Production

Rose oxide can be produced industrially beginning with photooxygenation of citronellol to give the allyl hydroperoxide which is then reduced with sodium sulfite to provide the diol. Ring-closure with sulfuric acid forms both the cis- and trans-isomers in equal amounts.[3]

Rose oxide synthesis

References

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