Retene

Retene

Names
IUPAC name 7-Isopropyl-1-methylphenanthrene
Other names Retene
Identifiers
CAS Registry Number	483-65-8 Y
ChemSpider	9805 N
EC number	207-597-9
InChI InChI=1S/C18H18/c1-12(2)14-7-10-17-15(11-14)8-9-16-13(3)5-4-6-18(16)17/h4-12H,1-3H3 N Key: NXLOLUFNDSBYTP-UHFFFAOYSA-N N InChI=1/C18H18/c1-12(2)14-7-10-17-15(11-14)8-9-16-13(3)5-4-6-18(16)17/h4-12H,1-3H3 Key: NXLOLUFNDSBYTP-UHFFFAOYAL
Jmol-3D images	Image
PubChem	10222
SMILES Cc1cccc3c1ccc2cc(C(C)C)ccc23
Properties
Chemical formula	C18H18
Molar mass	234.33552
Melting point	98.5 °C (209.3 °F; 371.6 K)
Boiling point	390 °C (734 °F; 663 K)
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
N verify (what is: Y/N?)
Infobox references

Retene, methyl isopropyl phenanthrene or 1-methyl-7-isopropyl phenanthrene, C₁₈H₁₈, is a polycyclic aromatic hydrocarbon present in the coal tar fraction, boiling above 360 °C. It occurs naturally in the tars obtained by the distillation of resinous woods. It crystallizes in large plates, which melt at 98.5 °C and boil at 390 °C. It is readily soluble in warm ether and in hot glacial acetic acid. Sodium and boiling amyl alcohol reduce it to a tetrahydroretene, whilst if it be heated with phosphorus and hydriodic acid to 260 °C, a dodecahydride is formed. Chromic acid oxidizes it to retene quinone, phthalic acid and acetic acid. It forms a picrate which melts at 123-124 °C.

Retene is derived by degradation of specific diterpenoids biologically produced by conifer trees.

The presence of traces of retene in the air is an indicator of forest fires; it is a major product of pyrolysis of conifer trees.^[1] It is also present in effluents from wood pulp and paper mills.^[2]

Retene, together with cadalene, simonellite and ip-iHMN, is a biomarker of higher plants, which makes it useful for paleobotanic analysis of rock sediments. Ratio of retene/cadalene in sediments can reveal the ratio of the genus Pinaceae in the biosphere.^[3]

References

1. ↑ Unsolved Mysteries of Human Health, Community Outreach and Education Program, Oregon State University
2. ↑ J. Koistinen, M. Lehtonena, K. Tukia, M. Soimasuo, M. Lahtiperab and A. Oikari (1998). "IDENTIFICATION OF LIPOPHILIC POLLUTANTS DISCHARGED FROM A FINNISH PULP AND PAPER MILL". Chemosphere 37 (2): 219–235. doi:10.1016/S0045-6535(98)00041-1. PMID 9650265. 
3. ↑ Y. Hautevelle, R. Michels, F. Malartre and A. Trouiller (2005). "Vascular plant biomarkers as ancient vegetation proxies and their stratigraphic use for tracing paleoclimatic changes during Jurassic in Western Europe" (ABSTRACT). Geophysical Research Abstracts 7: 10201. 

 This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). Encyclopædia Britannica (11th ed.). Cambridge University Press.