2,6-Xylenol

2,6-Xylenol^[1]
Names
	Preferred IUPAC name 2,6-Dimethylphenol
	Other names 2-Hydroxy-m-xylene
Identifiers
CAS Number	576-26-1 ;
3D model (JSmol)	Interactive image;
ChemSpider	13839174 ;
ECHA InfoCard	100.008.547
PubChem CID	11335;
UNII	I8N0RO87OV ;
CompTox Dashboard (EPA)	DTXSID9024063 ;
	InChI InChI=1S/C8H10O/c1-6-4-3-5-7(2)8(6)9/h3-5,9H,1-2H3 Key: NXXYKOUNUYWIHA-UHFFFAOYSA-N ; InChI=1/C8H10O/c1-6-4-3-5-7(2)8(6)9/h3-5,9H,1-2H3 Key: NXXYKOUNUYWIHA-UHFFFAOYAM;
	SMILES CC1=C(C(=CC=C1)C)O;
Properties
Chemical formula	C8H10O
Molar mass	122.167 g·mol−1
Melting point	43 to 45 °C (109 to 113 °F; 316 to 318 K)
Boiling point	203 °C (397 °F; 476 K)
Hazards
Flash point	86 °C (187 °F; 359 K)
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	(what is ?)
	Infobox references

2,6-Xylenol is a chemical compound which is one of the six isomers of xylenol. It is also commonly known as 2,6-dimethylphenol (DMP).

A known application of DMP is in the synthesis of Mexiletine.

Production[]

2,6-DMP can be produced by the direct methylation of phenol. This is carried out with gaseous phenol and methanol at elevated temperatures in the presence of a catalyst^[2]

Related polymers[]

2,6-Xylenol is a monomer for poly(p-phenylene oxide) engineering resins through carbon - oxygen oxidative coupling. Carbon-to-carbon dimerization is also possible. In one study 2,6-xylenol is oxidized with iodosobenzene diacetate with a fivefold excess of the phenol.^[3]

In the first step of the proposed reaction mechanism the acetyl groups in the iodine compound are replaced with the phenol. This complex dissociates into an aryl radical anion and a phenoxy residue. The two aryl radicals recombine forming a new carbon-carbon covalent bond and subsequently lose two protons in a rearomatization step. The immediate reaction product is a diphenoquinone as result of a one-step 4-electron oxidation. It is nevertheless possible to synthesize the biphenol compound via a comproportionation of the quinone with xylenol already present. In this reaction sequence the hypervalent iodine reagent is eventually reduced to phenyliodine.

synthesis of 3,5,3,5-tetramethyl-biphenyl-4,4-diol

References[]

^ 2,6-Xylenol at Sigma-Aldrich
^ Zukowski, W.; Berkowicz, G.; Baron, J.; Kandefer, S.; Jamanek, D.; Szarlik, S.; Wielgosz, Z.; Zielecka, M. (2014). "Selective phenol methylation to 2,6-dimethylphenol in a fluidized bed of iron-chromium mixed oxide catalyst with o-cresol circulation" (PDF). Chemistry Central Journal. 8 (1): 51. doi:10.1186/s13065-014-0051-6. PMC 4172955. PMID 25342964.
^ Selective oxidative para C–C dimerization of 2,6-dimethylphenol Christophe Boldron, Guillem Aromí, Ger Challa, Patrick Gamez and Jan Reedijk Chemical Communications, 2005, (46), 5808 - 5810 Abstract

[1] 2,6-Xylenol at Sigma-Aldrich

[2] Zukowski, W.; Berkowicz, G.; Baron, J.; Kandefer, S.; Jamanek, D.; Szarlik, S.; Wielgosz, Z.; Zielecka, M. (2014). "Selective phenol methylation to 2,6-dimethylphenol in a fluidized bed of iron-chromium mixed oxide catalyst with o-cresol circulation" (PDF). Chemistry Central Journal. 8 (1): 51. doi:10.1186/s13065-014-0051-6. PMC 4172955. PMID 25342964.

[3] Selective oxidative para C–C dimerization of 2,6-dimethylphenol Christophe Boldron, Guillem Aromí, Ger Challa, Patrick Gamez and Jan Reedijk Chemical Communications, 2005, (46), 5808 - 5810 Abstract

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