The geosmin products listed by Sigma-Aldrich (CAS Registry number [16423-19-1]) are synthetic, and would be exactly a 50:50 mixture of the (+) and (-) isomers. Specifically, the natural (-) isomer is (4S,4aS,8aR)-4,8a-Dimethyl-1,2,3,4,5,6,7,8-octahydronaphthalen-4a-ol. Therefore, the unnatural (+) isomer (the mirror image) is (4R,4aR,8aS)-4,8a-Dimethyl-1,2,3,4,5,6,7,8-octahydronaphthalen-4a-ol.This information has not been confirmed by a specific rotation measurement or chiral analysis, but is known based on the method of preparation.
G5908
(±)-Geosmin solution
2 mg/mL in methanol, ≥97%
Synonym(s):
DL-Geosmin, rel-(4R,4aR,8aS)-Octahydro-4,8a-dimethyl-4a(2H)-naphthalenol
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About This Item
Empirical Formula (Hill Notation):
C12H22O
CAS Number:
Molecular Weight:
182.30
EC Number:
MDL number:
UNSPSC Code:
12352100
PubChem Substance ID:
NACRES:
NA.22
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Quality Level
Assay
≥97% (calc. on dry substance, GC)
≥97%
concentration
2 mg/mL in methanol
storage temp.
−20°C
SMILES string
OC21C(CCCC2C)(CCCC1)C
InChI
1S/C12H22O/c1-10-6-5-8-11(2)7-3-4-9-12(10,11)13/h10,13H,3-9H2,1-2H3
InChI key
JLPUXFOGCDVKGO-UHFFFAOYSA-N
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Related Categories
Signal Word
Danger
Hazard Statements
Precautionary Statements
Hazard Classifications
Acute Tox. 3 Dermal - Acute Tox. 3 Inhalation - Acute Tox. 3 Oral - Flam. Liq. 2 - STOT SE 1
Target Organs
Eyes,Central nervous system
Storage Class Code
3 - Flammable liquids
WGK
WGK 2
Flash Point(F)
51.8 °F - closed cup
Flash Point(C)
11 °C - closed cup
Personal Protective Equipment
dust mask type N95 (US), Eyeshields, Gloves
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Protocols
Separation of 2-Isopropyl-3-methoxypyrazine 20 ppt; 2-Isobutyl-3-methoxypyrazine; 2-Methylisoborneol; (±)-Geosmin 10 ppt
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