o-Xylene

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

<templatestyles src="Chembox/styles.css"/>

Template:Chembox AllOtherNamesTemplate:Chembox headerbarTemplate:Chembox IndexlistTemplate:Chembox JmolTemplate:Chembox ChEMBLTemplate:Chembox ECHATemplate:Chembox E numberTemplate:Chembox IUPHAR ligandTemplate:Chembox UNIITemplate:Chembox CompToxTemplate:Chembox headerbarTemplate:Chembox SolubilityInWaterTemplate:Chembox headerbarTemplate:Chembox headerbarTemplate:Chembox OHS (set)Template:Chembox GHS (set)Template:Chembox Lethal amounts (set)Template:Chembox setHeaderTemplate:Chembox setDatarowTemplate:Chembox setDatarowTemplate:Chembox setDatarowTemplate:Chembox SDSTemplate:Chembox headerbarTemplate:Chembox Datapage checkTemplate:Chembox Footer
o-Xylene
Template:Chembox image sbs cell
Template:Longitem Template:Unbulleted list
Template:Longitem 1815558
ChEBI Template:Unbulleted list
ChemSpider Template:Unbulleted list
DrugBank Template:Unbulleted list
EC Number Template:Unbulleted list
Template:Longitem 67796
KEGG Template:Unbulleted list
Template:Longitem Template:Unbulleted list
RTECS number Template:Unbulleted list
UN number 1307
Script error: No such module "collapsible list".
Script error: No such module "collapsible list".
Template:Longitem Template:Chembox Elements/molecular formula
Molar mass Template:Chem molar mass
Appearance Colorless liquid
Density 0.88 g/ml
Melting point Template:Chembox CalcTemperatures
Boiling point Template:Chembox CalcTemperatures
Solubility in ethanol very soluble
Solubility in diethyl ether very soluble
Vapor pressure 7 mmHg (20°C)[2]
Template:Longitem −77.78·10−6 cm3/mol
Template:Longitem 1.50545
Viscosity 1.1049 cP at 0 °C
0.8102 cP at 20 °C
Template:Longitem 0.64 D[3]
NFPA 704 (fire diamond) Template:NFPA 704 diamond
Flash point Template:Chembox CalcTemperatures
Template:Longitem Template:Chembox CalcTemperatures
Explosive limits 0.9%-6.7%[2]
Template:Longitem 100 ppm[4] (TWA), 150 ppm[4] (STEL)
Template:Longitem m-xylene
p-xylene
toluene

Template:Chembox Footer/trackingScript error: No such module "TemplatePar".Template:Short description

o-Xylene (ortho-xylene) is an aromatic hydrocarbon with the formula C6H4(CH3)2, with two methyl substituents bonded to adjacent carbon atoms of a benzene ring (the ortho configuration). It is a constitutional isomer of m-xylene and p-xylene, the mixture being called xylene or xylenes. o-Xylene is a colourless slightly oily flammable liquid.[7]

Production and use

Petroleum contains about one weight percent xylenes. Most o-xylene is produced by cracking petroleum, which affords a distribution of aromatic compounds, including xylene isomers. m-Xylene is isomerized to o-xylene. Net production was approximately 500,000 tons in the year 2000.

o-Xylene is largely used in the production of phthalic anhydride, which is a precursor to many materials, drugs, and other chemicals.[7] Related to their easy oxidation, the methyl groups are susceptible to halogenation. When treated with elemental bromine, these groups are brominated, yielding xylylene dibromide:[8]

C6H4(CH3)2 + 2 Br2 → C6H4(CH2Br)2 + 2 HBr

Toxicity and exposure

Xylenes are not acutely toxic, for example the LD50 (rat, oral) is 4300 mg/kg. Effects vary with animal and xylene isomer. Concerns with xylenes focus on narcotic effects.[7]

References

<templatestyles src="Reflist/styles.css" />

  1. ↑ a b c Script error: No such module "citation/CS1".
  2. ↑ a b c d e f Script error: No such module "citation/CS1".
  3. ↑ Script error: No such module "Citation/CS1".
  4. ↑ a b Script error: No such module "citation/CS1".
  5. ↑ O-xylene toxicity
  6. ↑ Template:IDLH
  7. ↑ a b c Script error: No such module "Template wrapper".
  8. ↑ Script error: No such module "Citation/CS1".

Script error: No such module "Check for unknown parameters".

Script error: No such module "Navbox".

Retrieved from "http://debianws.lexgopc.com/wiki143/index.php?title=O-Xylene&oldid=2141646"