O-Xylene: Difference between revisions
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{{DISPLAYTITLE:''o''-Xylene}} |
{{DISPLAYTITLE:''o''-Xylene}} |
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{{chembox |
{{chembox |
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|Watchedfields = changed |
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|verifiedrevid = 462263866 |
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|Name = ''o''-Xylene |
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|ImageFileL1 = Ortho-Xylene-2D-structure.svg |
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|ImageNameL1 = Skeletal formula |
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|ImageFileR1 = o-xylene-spaceFill.png |
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|ImageSizeR1 = 150px |
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|ImageNameR1 = Space-filling model |
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|PIN = 1,2-Xylene<ref name=iupac2013>{{cite book | title = Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book) | publisher = [[Royal Society of Chemistry|The Royal Society of Chemistry]] | date = 2014 | location = Cambridge | pages = 121, 139, 653 | doi = 10.1039/9781849733069 | isbn = 978-0-85404-182-4}}</ref> |
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|SystematicName = 1,2-Dimethylbenzene<ref name=iupac2013 /> |
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|OtherNames = ''o''-Xylene,<ref name=iupac2013 /> o-Xylol <!-- not o-methyltoluene, substitution of toluene by additional methyl groups is not allowed --> |
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| OtherNames = ''ortho''-Xylene |
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|Section1={{Chembox Identifiers |
|Section1={{Chembox Identifiers |
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|CASNo = 95-47-6 |
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|Beilstein = 1815558 |
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|ChEMBL_Ref = {{ebicite|correct|EBI}} |
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|ChEMBL = 45005 |
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| KEGG_Ref = {{keggcite|correct|kegg}} |
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| KEGG = C07212 |
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|EC_number = 202-422-2 |
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|Gmelin = 67796 |
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|KEGG_Ref = {{keggcite|correct|kegg}} |
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|KEGG = C07212 |
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|PubChem = 7237 |
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|UNNumber = 1307 |
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|Section2={{Chembox Properties |
|Section2={{Chembox Properties |
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|C=8 | H=10 |
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|Appearance = Colorless liquid |
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|Density = 0.88 g/ml |
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|MeltingPtC = -24 |
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|BoilingPtC = 144.4 |
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|Solubility = 0.02% (20°C)<ref name=PGCH/> |
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|Solubility1 = very soluble |
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|Solvent1 = ethanol |
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|Solubility2 = very soluble |
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|Solvent2 = diethyl ether |
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|RefractIndex = 1.50545 |
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|Viscosity = 1.1049 c[[Poise (unit)|P]] at 0 °C<br>0.8102 c[[Poise (unit)|P]] at 20 °C |
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|VaporPressure = 7 mmHg (20°C)<ref name=PGCH/> |
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|MagSus = -77.78·10<sup>−6</sup> cm<sup>3</sup>/mol |
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}} |
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|Section3={{Chembox Structure |
|Section3={{Chembox Structure |
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|Dipole = 0.64 [[Debye|D]]<ref>{{Cite journal | doi = 10.1016/0022-2852(73)90016-7 | title = Microwave spectrum, barrier for methyl rotation, methyl conformation, and dipole moment of ortho-xylene | year = 1973 | last1 = Rudolph | first1 = H.D. | last2 = Walzer | first2 = K. | last3 = Krutzik | first3 = Irmhild | journal = Journal of Molecular Spectroscopy | volume = 47 | issue = 2 | pages = 314| bibcode = 1973JMoSp..47..314R }}</ref>}} |
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|MainHazards = Mildly toxic |
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}} |
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|FlashPtC = 32 |
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| EUClass = Harmful ('''Xn''') Flammable ('''F''') |
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|NFPA-F = 3 |
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|NFPA-R = 0 |
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|GHSPictograms = {{GHS02}}{{GHS07}}{{GHS08}} |
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|GHSSignalWord = Danger |
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| NFPA-R = 0 |
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|HPhrases = {{H-phrases|225|226|304|305|312|315|319|332|335|412}} |
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| NFPA-S = |
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|PPhrases = {{P-phrases|210|233|240|241|242|243|261|264|271|273|280|301+310|302+352|303+361+353|304+312|304+340|305+351+338|312|321|322|331|332+313|337+313|362|363|370+378|403+233|403+235|405|501}} |
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| RPhrases = {{R11}} {{R20}} {{R21}} {{R38}} |
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| SPhrases = {{S25}} |
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|ExploLimits = 0.9%-6.7%<ref name=PGCH/> |
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|IDLH = 900 ppm<ref name=PGCH/> |
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|REL = TWA 100 ppm (435 mg/m<sup>3</sup>) ST 150 ppm (655 mg/m<sup>3</sup>)<ref name=PGCH/> |
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|LD50 = 4300 mg/kg (rats, [[Oral administration|oral]]ly)<ref>O-xylene toxicity</ref> |
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|LCLo = 6125 ppm (rat, 12 hr)<br/>6125 ppm (human, 12 hr)<ref>{{IDLH|95476|Xylene (o-, m-, p-isomers)}}</ref> |
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}} |
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|Section5={{Chembox Related |
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|OtherFunction_label = [[aromatic hydrocarbon]]s |
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|OtherFunction = [[M-Xylene|''m''-xylene]]<br>[[P-Xylene|''p''-xylene]]<br>[[toluene]] |
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'''''o''-Xylene''' ('''''ortho''-xylene''') is an [[aromatic |
'''''o''-Xylene''' ('''''ortho''-xylene''') is an [[aromatic hydrocarbon]] with the [[formula]] C<sub>6</sub>H<sub>4</sub>(CH<sub>3</sub>)<sub>2</sub>, with two [[methyl]] [[substituent]]s bonded to adjacent carbon [[atom]]s of a [[benzene]] [[Ring (chemistry)|ring]] (the [[Arene substitution pattern|ortho]] configuration). It is a [[constitutional isomer]] of [[M-Xylene|''m''-xylene]] and [[P-Xylene|''p''-xylene]], the mixture being called [[xylene]] or xylenes. ''o''-Xylene is a [[colour]]less slightly [[oil]]y flammable [[liquid]].<ref name="Ullmann">{{Ullmann|author1=Fabri, Jörg |author2=Graeser, Ulrich|author3= Simo, Thomas A.|title=Xylenes|year=2000|doi=10.1002/14356007.a28_433}}</ref> |
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==Production and use== |
==Production and use== |
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[[Petroleum]] contains about one weight percent xylenes. |
[[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. |
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''o''-Xylene is largely used in the production of [[phthalic anhydride]], which is a precursor to many materials, drugs, and other chemicals.<ref name="Ullmann"/> Related to their easy oxidation, the methyl groups are susceptible to halogenation. When treated with bromine, these groups are brominated, |
''o''-Xylene is largely used in the production of [[phthalic anhydride]], which is a precursor to many materials, drugs, and other chemicals.<ref name="Ullmann"/> Related to their easy oxidation, the methyl groups are susceptible to halogenation. When treated with elemental [[bromine]], these groups are brominated, yielding [[xylylene dibromide]]:<ref>{{cite journal|author=Emily F. M. Stephenson|year=1954|title=o-Xylylene Dibromide|journal=Organic Syntheses|volume=34|page=100|doi=10.15227/orgsyn.034.0100}}</ref> |
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:C<sub>6</sub>H<sub>4</sub>(CH<sub>3</sub>)<sub>2</sub> |
:C<sub>6</sub>H<sub>4</sub>(CH<sub>3</sub>)<sub>2</sub> + 2 Br<sub>2</sub> → C<sub>6</sub>H<sub>4</sub>(CH<sub>2</sub>Br)<sub>2</sub> + 2 HBr |
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==Toxicity and exposure== |
==Toxicity and exposure== |
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Xylenes are not acutely toxic, for example the {{LD50}} (rat, oral) is 4300 |
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.<ref name="Ullmann"/> |
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==References== |
==References== |
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{{reflist}} |
{{reflist}} |
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{{Hydrocarbons}} |
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{{DEFAULTSORT:Xylene, o-}} |
{{DEFAULTSORT:Xylene, o-}} |
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[[Category:Alkylbenzenes]] |
[[Category:Alkylbenzenes]] |
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[[Category:C2-Benzenes]] |
Latest revision as of 09:02, 17 March 2024
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Names | |||
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Preferred IUPAC name
1,2-Xylene[1] | |||
Systematic IUPAC name
1,2-Dimethylbenzene[1] | |||
Other names
o-Xylene,[1] o-Xylol
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Identifiers | |||
3D model (JSmol)
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1815558 | |||
ChEBI | |||
ChEMBL | |||
ChemSpider | |||
DrugBank | |||
ECHA InfoCard | 100.002.203 | ||
EC Number |
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67796 | |||
KEGG | |||
PubChem CID
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RTECS number |
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UNII | |||
UN number | 1307 | ||
CompTox Dashboard (EPA)
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Properties | |||
C8H10 | |||
Molar mass | 106.168 g·mol−1 | ||
Appearance | Colorless liquid | ||
Density | 0.88 g/ml | ||
Melting point | −24 °C (−11 °F; 249 K) | ||
Boiling point | 144.4 °C (291.9 °F; 417.5 K) | ||
0.02% (20°C)[2] | |||
Solubility in ethanol | very soluble | ||
Solubility in diethyl ether | very soluble | ||
Vapor pressure | 7 mmHg (20°C)[2] | ||
-77.78·10−6 cm3/mol | |||
Refractive index (nD)
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1.50545 | ||
Viscosity | 1.1049 cP at 0 °C 0.8102 cP at 20 °C | ||
Structure | |||
0.64 D[3] | |||
Hazards | |||
Occupational safety and health (OHS/OSH): | |||
Main hazards
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Mildly toxic | ||
GHS labelling: | |||
Danger | |||
H225, H226, H304, H305, H312, H315, H319, H332, H335, H412 | |||
P210, P233, P240, P241, P242, P243, P261, P264, P271, P273, P280, P301+P310, P302+P352, P303+P361+P353, P304+P312, P304+P340, P305+P351+P338, P312, P321, P322, P331, P332+P313, P337+P313, P362, P363, P370+P378, P403+P233, P403+P235, P405, P501 | |||
NFPA 704 (fire diamond) | |||
Flash point | 32 °C (90 °F; 305 K) | ||
463 °C (865 °F; 736 K)[4] | |||
Explosive limits | 0.9%-6.7%[2] | ||
Threshold limit value (TLV)
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100 ppm[4] (TWA), 150 ppm[4] (STEL) | ||
Lethal dose or concentration (LD, LC): | |||
LD50 (median dose)
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4300 mg/kg (rats, orally)[5] | ||
LCLo (lowest published)
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6125 ppm (rat, 12 hr) 6125 ppm (human, 12 hr)[6] | ||
NIOSH (US health exposure limits): | |||
PEL (Permissible)
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TWA 100 ppm (435 mg/m3)[2] | ||
REL (Recommended)
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TWA 100 ppm (435 mg/m3) ST 150 ppm (655 mg/m3)[2] | ||
IDLH (Immediate danger)
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900 ppm[2] | ||
Safety data sheet (SDS) | External MSDS | ||
Related compounds | |||
Related aromatic hydrocarbons
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m-xylene p-xylene toluene | ||
Supplementary data page | |||
O-Xylene (data page) | |||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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
[edit]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
[edit]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
[edit]- ^ a b c Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. pp. 121, 139, 653. doi:10.1039/9781849733069. ISBN 978-0-85404-182-4.
- ^ a b c d e f NIOSH Pocket Guide to Chemical Hazards. "#0668". National Institute for Occupational Safety and Health (NIOSH).
- ^ Rudolph, H.D.; Walzer, K.; Krutzik, Irmhild (1973). "Microwave spectrum, barrier for methyl rotation, methyl conformation, and dipole moment of ortho-xylene". Journal of Molecular Spectroscopy. 47 (2): 314. Bibcode:1973JMoSp..47..314R. doi:10.1016/0022-2852(73)90016-7.
- ^ a b c "o-Xylene". International Chemical Safety Cards. ICSC/NIOSH. July 1, 2014.
- ^ O-xylene toxicity
- ^ "Xylene (o-, m-, p-isomers)". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
- ^ a b c Fabri, Jörg; Graeser, Ulrich; Simo, Thomas A. (2000). "Xylenes". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a28_433. ISBN 978-3527306732.
- ^ Emily F. M. Stephenson (1954). "o-Xylylene Dibromide". Organic Syntheses. 34: 100. doi:10.15227/orgsyn.034.0100.