1.0 2010-04-08 22:06:51 UTC 2025-11-18 23:00:09 UTC FDB005820 1,4-Dimethylbenzene p-Xylene, also known as para-xylene or p-methyltoluene, compounds known as benzene and substituted derivatives. These are aromatic compounds containing one monocyclic ring system consisting of benzene which is substituted by a variable number of methyl groups in different positions. As such, p-xylene is a monocyclic benzene carrying two methyl groups at positions 1 and 4. p-Xylene occurs naturally in petroleum and coal tar. It is a constitutional isomer of m-xylene and o-xylene, the mixture being called xylene or xylenes. It is emitted by most combustion sources, including automobile exhaust and tobacco smoke. p-Xylene is a colorless, slightly oily flammable liquid. p-Xylene has been detected, but not quantified in, several different foods, such as pepper (C. annuum), green bell peppers, parsley, yellow bell peppers, and red bell peppers. This could make p-xylene a potential biomarker for the consumption of these foods. p-Xylene is a potentially toxic compound. Inhaling p-xylene can cause dizziness, headache, drowsiness, and nausea. If p-xylene is ingested one's mouth should be rinsed, and vomiting should not be induced. p-Xylene can cause issues with the central nervous system and if swallowed could cause chemical pneumonitis when breathed into the lungs. It is a component in the production of terephthalic acid for polyesters such as polyethylene terephthalate (generally known as PET). 1, 4-Xylene 1,4-dimethyl-benzene ( p-xylene) 1,4-Xylene 4-Methyltoluene 4-Xylene Benzene, 1,4-dimethyl- Benzene, p-dimethyl- Chromar P-dimethylbenzene p-Xylene [UN1307] [Flammable liquid] p-XYLENE- D10 P-xylol Para-xylene PXY Scintillar Xylene, p- Xylene, p-isomer C8H10 106.165 106.07825032 1,4-xylene para-xylene 106-42-3 CC1=CC=C(C)C=C1 InChI=1S/C8H10/c1-7-3-5-8(2)6-4-7/h3-6H,1-2H3 URLKBWYHVLBVBO-UHFFFAOYSA-N belongs to the class of organic compounds known as p-xylenes. These are aromatic compounds that contain a p-xylene moiety, which is a monocyclic benzene carrying exactly two methyl groups at the 1- and 4-positions. p-Xylenes Organic compounds Benzenoids Benzene and substituted derivatives Xylenes Aromatic homomonocyclic compounds Aromatic hydrocarbons Unsaturated hydrocarbons Aromatic homomonocyclic compound Aromatic hydrocarbon Hydrocarbon P-xylene Unsaturated hydrocarbon an aromatic compound xylene liquid logp 3.15 ALOGPS logs -2.72 ALOGPS solubility 2.01e-01 g/l ALOGPS melting_point 13.25 oC logp 3 ChemAxon iupac 1,4-xylene ChemAxon average_mass 106.165 ChemAxon mono_mass 106.07825032 ChemAxon smiles CC1=CC=C(C)C=C1 ChemAxon formula C8H10 ChemAxon inchi InChI=1S/C8H10/c1-7-3-5-8(2)6-4-7/h3-6H,1-2H3 ChemAxon inchikey URLKBWYHVLBVBO-UHFFFAOYSA-N ChemAxon polar_surface_area 0 ChemAxon refractivity 36.14 ChemAxon polarizability 13.12 ChemAxon rotatable_bond_count 0 ChemAxon acceptor_count 0 ChemAxon donor_count 0 ChemAxon physiological_charge 0 ChemAxon formal_charge 0 ChemAxon Specdb::MsMs 61749 Specdb::MsMs 61750 Specdb::MsMs 61751 Specdb::MsMs 118341 Specdb::MsMs 118342 Specdb::MsMs 118343 Specdb::MsMs 3223993 Specdb::MsMs 3223994 Specdb::MsMs 3223995 Specdb::MsMs 3223996 Specdb::MsMs 3223997 Specdb::MsMs 3223998 Specdb::CMs 26793 Specdb::CMs 27058 Specdb::CMs 29991 Specdb::CMs 35572 Specdb::CMs 102418 Specdb::CMs 102419 Specdb::CMs 102420 Specdb::CMs 131312 Specdb::CMs 139046 Specdb::EiMs 386 Specdb::NmrOneD 2088 Specdb::NmrOneD 2782 HMDB0059924 Black walnut Type 1 specific Juglans nigra 16719 300.0 300.0 300.0 mg/100 g Blackberry Type 1 specific Rubus Cauliflower Type 1 specific Brassica oleracea var. botrytis 3715 Corn Type 1 specific Zea mays 4577 Evergreen blackberry Type 1 specific Rubus laciniatus Green bell pepper Type 1 specific Capsicum annuum 4072 Orange bell pepper Type 1 specific Capsicum annuum 4072 Parsley Type 1 specific Petroselinum crispum 4043 Pepper Type 1 specific Capsicum annuum 4072 Pepper (C. frutescens) Type 1 specific Capsicum annuum var. annuum 40321 Red bell pepper Type 1 specific Capsicum annuum 4072 Sweet cherry Type 1 specific Prunus avium 42229 Yellow bell pepper Type 1 specific Capsicum annuum 4072