- Retene
Chembox new
ImageFile=Retene.png
ImageSize=200px
IUPACName=7-Isopropyl-1-methylphenanthrene
OtherNames=Retene
Section1= Chembox Identifiers
CASNo=483-65-8
PubChem=10222
SMILES=Cc3cccc2c1ccc (C(C)C)cc1ccc23
Section2= Chembox Properties
Formula=C18H18
MolarMass=234.33552
Appearance=
Density=
MeltingPt=98.5 °C
BoilingPt=390 °C
Solubility=
Section3= Chembox Hazards
MainHazards=
FlashPt=
Autoignition=Retene, methyl isopropyl phenanthrene or 1-methyl-7-isopropyl phenanthrene, C18H18, is a
polycyclic aromatic hydrocarbon present in thecoal tar fraction,boiling above 360 °C. It occurs naturally in thetar s obtained by thedistillation ofresin ouswood s. 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 hotglacial acetic acid .Sodium and boilingamyl alcohol reduce it to atetrahydroretene , whilst if it be heated withphosphorus andhydriodic acid to 260 °C, a dodecahydride is formed.Chromic acid oxidizes it toretene quinone ,phthalic acid andacetic acid . It forms apicrate which melts at 123-124 °C.Retene is derived by degradation of specific
diterpenoid s biologically produced byconifer trees.The presence of traces of retene in the air is an indicator of
forest fire s; it is a major product ofpyrolysis ofconifer trees. [ [http://www.unsolvedmysteries.oregonstate.edu/GCMS_04.shtml Unsolved Mysteries of Human Health] , Community Outreach and Education Program, Oregon State University] It is also present ineffluent s fromwood pulp andpaper mill s.Fact|date=December 2007Retene, together with
cadalene ,simonellite andip-iHMN , is abiomarker ofhigher plant s, which makes it useful forpaleobotanic analysis of rocksediment s. Ratio of retene/cadalene in sediments can reveal the ratio of the genus "Pinaceae " in the biosphere. [cite journal|journal=Geophysical Research Abstracts|volume=7|pages=10201|year=2005|title=Vascular plant biomarkers as ancient vegetation proxies and their stratigraphic use for tracing paleoclimatic changes during Jurassic in Western Europe|author=Y. Hautevelle, R. Michels, F. Malartre and A. Trouiller|url=http://www.cosis.net/abstracts/EGU05/10201/EGU05-J-10201.pdf|format=abstract]References
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