Retene


Retene

Chembox new
ImageFile=Retene.pngImageSize=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 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. [ [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 in effluents from wood pulp and paper mills.Fact|date=December 2007

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. [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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Look at other dictionaries:

  • Retene — Ret ene, n. [Gr. ??? pine resin.] (Chem.) A white crystalline hydrocarbon, polymeric with benzene. It is extracted from pine tar, and is also found in certain fossil resins. [1913 Webster] …   The Collaborative International Dictionary of English

  • retene — [rē′tēn, ret′ēn] n. [< Gr rhētinē,RESIN] a hydrocarbon, C18H18, obtained from resinous woods and fossil resins …   English World dictionary

  • retene — retenas statusas T sritis chemija formulė CH₃C₁₄H₈CH(CH₃)₂ atitikmenys: angl. retene rus. ретен ryšiai: sinonimas – 7 izopropil 1 metilfenantrenas …   Chemijos terminų aiškinamasis žodynas

  • retene — /ree teen, ret een/, n. Chem. a crystalline hydrocarbon, C18H18, obtained chiefly from the tar of resinous woods and certain fossil resins. [1865 70; < Gk rhet(íne) RESIN + ENE] * * * …   Universalium

  • retene — re•tene [[t]ˈri tin, ˈrɛt in[/t]] n. chem. a crystalline hydrocarbon, C18H18, derived from pine tar and other resins, and used in organic synthesis • Etymology: 1865–70; < Gk rhēt(inē) resin+ ene …   From formal English to slang

  • retene — /ˈritin/ (say reeteen), /ˈrɛtin/ (say reteen) noun a crystalline hydrocarbon, C18H18, obtained from the tar of resinous woods, certain fossil resins, etc. {Greek rhētinē resin. See ene} …   Australian English dictionary

  • retene — ˈrēˌtēn, ˈreˌ noun ( s) Etymology: Greek rhētinē resin : a crystalline hydrocarbon C18H18 isolated especially from pine tar, rosin oil, and various fossil resins but usually prepared from abietic acid and related compounds by dehydrogenation; 1… …   Useful english dictionary

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  • Cadalene — Chembox new ImageFile=Cadalene.png ImageSize=150px IUPACName=4 Isopropyl 1,6 dimethylnaphthalene OtherNames= Section1= Chembox Identifiers CASNo=483 78 3 PubChem=10225 SMILES=Cc2ccc(C(C)C)c1cc(C)ccc12 Section2= Chembox Properties Formula=C15H18… …   Wikipedia