1,1,6-Trimethyl-1,2-dihydronaphthalene

1,1,6-Trimethyl-1,2-dihydronaphthalene (TDN) is an aroma compound present in wine,[1] particularly aged Rieslings.[2][3] Chemically, it is classified as a 13C-norisoprenoid, as it has thirteen carbon atoms, and is derived from an isoprenoid by the loss of methylene groups.[4]

1,1,6-Trimethyl-1,2-dihydronaphthalene
Names
IUPAC name
1,1,6-Trimethyl-1,2-dihydronaphthalene
Other names
1,2-Dihydro-1,1,6-trimethylnaphthalene
Identifiers
3D model (JSmol)
Abbreviations TDN
ChEBI
ChemSpider
ECHA InfoCard 100.045.577
EC Number
  • 250-150-8
UNII
  • InChI=1S/C13H16/c1-10-6-7-12-11(9-10)5-4-8-13(12,2)3/h4-7,9H,8H2,1-3H3
    Key: RTUMCNDCAVLXEP-UHFFFAOYSA-N
  • CC1=CC2=C(C=C1)C(CC=C2)(C)C
Properties
C13H16
Molar mass 172.271 g·mol−1
Boiling point 115 °C (239 °F; 388 K)
at 18 Torr[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

In wines, TDN is generally considered to contribute to a desirable aroma in low concentrations, but an undesirable aroma in higher concentrations.[5] The aroma is commonly described as a petrol note or by the French term goût de pétrole.[6]

TDN is believed to be a degradation product of β-carotene and lutein.[4] TDN can also by synthesized in the laboratory from either of the ionones, α-ionone or β-ionone.[1]

References
  1. Dobrydnev, Alexey; Tarasov, Andrii; Müller, Nikolaus; Volovenko, Yulian; Rauhut, Doris; Jung, Rainer (2020). "An optimized method for synthesis and purification of 1,1,6-trimethyl-1,2-dihydronaphthalene (TDN)". MethodsX. 7: 56–61. doi:10.1016/j.mex.2019.12.009. PMC 6938800. PMID 31908985.
  2. Sacks, Gavin L.; Gates, Matthew J.; Ferry, Francois X.; Lavin, Edward H.; Kurtz, Anne J.; Acree, Terry E. (2012). "Sensory Threshold of 1,1,6-Trimethyl-1,2-dihydronaphthalene (TDN) and Concentrations in Young Riesling and Non-Riesling Wines". Journal of Agricultural and Food Chemistry. 60 (12): 2998–3004. doi:10.1021/jf205203b. PMID 22397689.
  3. Dein, Melissa; Kerley, Trenton; Munafo, John P. (2021). "Characterization of Odorants in a 10-Year-Old Riesling Wine". Journal of Agricultural and Food Chemistry. 69 (38): 11372–11381. doi:10.1021/acs.jafc.1c04196. PMID 34547201. S2CID 237596110.
  4. Waterhouse Lab (2016). "TDN, (1,1,6,-trimethyl-1,2-dihydronapthalene)". University of California, Davis.
  5. Cory Black; Leigh Francis; Prue Henschke; Dimitra Capone; Samantha Anderson; Martin Day; Helen Holt; Wes Pearson; Markus Herderich; Dan Johnson (2012). "Aged Riesling and the development of TDN" (PDF). The Australian Wine Research Institute.
  6. Owen Bird (2005). Rheingold - The German Wine Renaissance. Arima Publishing. pp. 90–97. ISBN 978-1-84549-079-9.
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