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2,6-Dimethylphenol ( CASNO:576-26-1 )

Identification and Related Records
Name:
2,6-Dimethylphenol
CAS Registry number:
576-26-1
Synonyms:
2,6-Xylenol
EINECS(EC#):
209-400-1
Molecular Formula:
C8H10O
Molecular Weight:
122.17
Inchi:
InChI=1/C8H10O/c1-6-4-3-5-7(2)8(6)9/h3-5,9H,1-2H3
Canonical SMILES:
CC1=C(C(=CC=C1)C)O
Chemical and Physical Properties
Appearance:
white crystal
Density:
1.15
Melting Point:
44-46℃
Boiling Point:
203℃
Refractive Index:
1.5148 (65 C)
Flash Point:
73℃
Water:
10 g/L (20℃)
Solubilities:
10 g/L (20 °C) in water
Color/Form:
LEAVES OR NEEDLES FROM ALCOHOL
Stability:
Stable. Very flammable. Incompatible with oxidizing agents, acid chlorides, acid anhydrides, steel, copper, copper alloys, bases, acid chlorides.
HS Code:
29071400
Storage temp:
Keep away from heat, sparks, and flame. Keep away from sources of ignition. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Spectral properties:
Index of refraction: 1.5171 @ 60 deg C
MAX ABSORPTION (ALCOHOL): 271 NM (LOG E= 3.19); 275.5 NM (LOG E= 3.16); SADTLER REFERENCE NUMBER: 294 (IR, PRISM); 100 (IR, GRATING)
MASS: 4053 (National Bureau of Standards EPA-NIH Mass Spectra Data Base, NSRDS-NBS-63)
IR: 5626 (Coblentz Society Spectral Collection)
UV: 21874 (Sadtler Research Laboratories Spectral Collection)
NMR: 36 (Sadtler Research Laboratories Spectral Collection)
MASS: 509 (Atlas of Mass Spectral Data, John Wiley & Sons, New York)
Computed Properties:
Molecular Weight:122.1644 [g/mol]
Molecular Formula:C8H10O
XLogP3:2.4
H-Bond Donor:1
H-Bond Acceptor:1
Rotatable Bond Count:0
Tautomer Count:2
Exact Mass:122.073165
MonoIsotopic Mass:122.073165
Topological Polar Surface Area:20.2
Heavy Atom Count:9
Formal Charge:0
Complexity:80.6
Isotope Atom Count:0
Defined Atom Stereocenter Count:0
Undefined Atom Stereocenter Count:0
Defined Bond Stereocenter Count:0
Undefined Bond Stereocenter Count:0
Covalently-Bonded Unit Count:1
Feature 3D Donor Count:1
Feature 3D Ring Count:1
Effective Rotor Count:0
Conformer Sampling RMSD:0.4
CID Conformer Count:1
Safety and Handling
Hazard Codes:
T:Toxic;N:Dangerousfortheenvironment;
Risk Statements:
R24/25;R34;R51/53
Safety Statements:
S26;S36/37/39;S45;S61
HazardClass:
6.1
PackingGroup:
II
Skin, Eye, and Respiratory Irritations:
An eye irritant.
Cleanup Methods:
FOUNDRY PLANT WASTE GASES WERE DEODORIZED WITH POTASSIUM PERMANGANATE, & DEODORIZATION EFFICIENCY WAS MEASURED BY PRESENCE OF 2,6-XYLENOL IN SCRUBBED WASTE GASES.
Transport:
UN 2261
Formulations/Preparations:
Pitt-Consol Xylenol 235 is a synthetic 2,6-xylenol. Homolog distribution, wt%: Ortho cresol, 0.5; 2,6-xylenols, 92; 2,4/2,5 xylenols, 0.5; meta/para cresol, 7.
Grade or purity: 99%
Pitt-Consol Xylenol 410 is a synthetic xylenol blend ... homolog distribution, wt %: 2,6-xylenol, 1; 2,4-xylenol, 42; 2,5-xylenol, 43; 2,3-xylenol group, 14. /Xylenol 410/
DOT Emergency Guidelines:
/GUIDE 153: SUBSTANCES - TOXIC AND/OR CORROSIVE (COMBUSTIBLE)/ Health: TOXIC; inhalation, ingestion, or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution. /Xylenols; Xylenols, liquid; Xylenols, solid/
/GUIDE 153: SUBSTANCES - TOXIC AND/OR CORROSIVE (COMBUSTIBLE)/ Fire or Explosion: Combustible material: may burn but does not ignite readily. When heated, vapors may form explosive mixtures with air: indoors, outdoors, and sewers explosion hazards. Those substances designated with a "P" may polymerize explosively when heated or involved in a fire. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated. Runoff may pollute waterways. Substance may be transported in a molten form. /Xylenols; Xylenols, liquid; Xylenols, solid/
/GUIDE 153: SUBSTANCES - TOXIC AND/OR CORROSIVE (COMBUSTIBLE)/ Public Safety: CALL Emergency Response Telephone Number ... . As an immediate precautionary measure, isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids. Keep unauthorized personnel away. Stay upwind. Keep out of low areas. Ventilate enclosed areas. /Xylenols; Xylenols, liquid; Xylenols, solid/
/GUIDE 153: SUBSTANCES - TOXIC AND/OR CORROSIVE (COMBUSTIBLE)/ Protective Clothing: Wear positive pressure self-contained breathing apparatus (SCBA). Wear chemical protective clothing that is specifically recommended by the manufacturer. It may provide little or no thermal protection. Structural firefighters' protective clothing provides limited protection in fire situations ONLY; it is not effective in spill situations where direct contact with the substance is possible. /Xylenols; Xylenols, liquid; Xylenols, solid/
/GUIDE 153: SUBSTANCES - TOXIC AND/OR CORROSIVE (COMBUSTIBLE)/ Evacuation: ... Fire: If tank, rail car or tank truck is involved in a fire, ISOLATE for 800 meters (1/2 mile) in all directions; also, consider initial evacuation for 800 meters (1/2 mile) in all directions. /Xylenols; Xylenols, liquid; Xylenols, solid/
/GUIDE 153: SUBSTANCES - TOXIC AND/OR CORROSIVE (COMBUSTIBLE)/ Fire: Small fires: Dry chemical, CO2 or water spray. Large fires: Dry chemical, CO2, alcohol-resistant foam or water spray. Move containers from fire area if you can do it without risk. Dike fire control water for later disposal; do not scatter the material. Fire involving tanks or car/trailer loads: Fight fire from maximum distance or use unmanned hose holders or monitor nozzles. Do not get water inside containers. Cool containers with flooding quantities of water until well after fire is out. Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank. ALWAYS stay away from tanks engulfed in fire. /Xylenols; Xylenols, liquid; Xylenols, solid/
/GUIDE 153: SUBSTANCES - TOXIC AND/OR CORROSIVE (COMBUSTIBLE)/ Spill or Leak: ELIMINATE all ignition sources (no smoking, flares, sparks or flames in immediate area). Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Prevent entry into waterways, sewers, basements or confined areas. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. DO NOT GET WATER INSIDE CONTAINERS. /Xylenols; Xylenols, liquid; Xylenols, solid/
/GUIDE 153: SUBSTANCES - TOXIC AND/OR CORROSIVE (COMBUSTIBLE)/ First Aid: Move victim to fresh air. Call 911 or emergency medical service. Give artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; give artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult. Remove and isolate contaminated clothing and shoes. In case of contact with substance, immediately flush skin or eyes with running water for at least 20 minutes. For minor skin contact, avoid spreading material on unaffected skin. Keep victim warm and quiet. Effects of exposure (inhalation, ingestion or skin contact) to substance may be delayed. Ensure that medical personnel are aware of the material(s) involved and take precautions to protect themselves. /Xylenols; Xylenols, liquid; Xylenols, solid/
Other Preventative Measures:
SRP: The scientific literature for the use of contact lenses in industry is conflicting. The benefit or detrimental effects of wearing contact lenses depend not only upon the substance, but also on factors including the form of the substance, characteristics and duration of the exposure, the uses of other eye protection equipment, and the hygiene of the lenses. However, there may be individual substances whose irritating or corrosive properties are such that the wearing of contact lenses would be harmful to the eye. In those specific cases, contact lenses should not be worn. In any event, the usual eye protection equipment should be worn even when contact lenses are in place.
Protective Equipment and Clothing:
Some data suggesting breakthrough times /for butyl rubber/ of approximately an hour or more. /Aromatic hydroxyl cmpd/
Breakthrough times /for neoprene/ greater than one hour reported by (normally) two or more testers. /Aromatic hydroxyl cmpd/
Breakthrough times /for polyvinyl alcohol/ less (usually significantly less) than one hour reported by (normally) two or more testers. /Aromatic hydroxyl cmpd/
Specification:
The IUPAC name of 2,6-Xylenol is 2,6-dimethylphenol. With the CAS registry number 576-26-1, it is also named as 1-Hydroxy-2,6-dimethylbenzene. The product's categories are aromatic phenols; phenoles and thiophenoles. It is colorless to off-white crystalline solid with a sweet tarry odor. And this chemical is soluble in alcohol, ether, chloroform, benzene and alkali solution, very slightly soluble in cold water. In addition, it is stable, very flammable, and incompatible with oxidizing agents, acid chlorides, acid anhydrides, steel, copper, copper alloys, bases, acid chlorides. Furthermore, 2,6-Xylenol should be stored away from extreme heat and away from strong oxidizing agents.  The other characteristics of this product can be summarized as: (1)ACD/LogP: 2.40; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 2.4; (4)ACD/LogD (pH 7.4): 2.4; (5)ACD/BCF (pH 5.5): 39.41; (6)ACD/BCF (pH 7.4): 39.39; (7)ACD/KOC (pH 5.5): 482.78; (8)ACD/KOC (pH 7.4): 482.51; (9)#H bond acceptors: 1; (10)#H bond donors: 1; (11)#Freely Rotating Bonds: 1; (12)Index of Refraction: 1.54; (13)Molar Refractivity: 37.78 cm3; (14)Molar Volume: 120.4 cm3; (15)Polarizability: 14.97×10-24 cm3; (16)Surface Tension: 37.2 dyne/cm; (17)Enthalpy of Vaporization: 45.51 kJ/mol; (18)Vapour Pressure: 0.221 mmHg at 25°C; (19)Tautomer Count: 2; (20)Exact Mass: 122.073165; (21)MonoIsotopic Mass: 122.073165; (22)Topological Polar Surface Area: 20.2; (23)Heavy Atom Count: 9; (24)Complexity: 80.6. Preparation 2,6-Xylenol: Using phenol or orthocresol as raw material, then they have a gas phase catalytic reaction with methanol. Through distillation and purification, we can obtain the product and its purity is over 99%. Uses of 2,6-Xylenol: It is an intermediate for the manufacture of polyphenylene oxide and modified phenolic resins and phosphate esters. And it is also used in the production of hydraulic fluids, in halogenation and aminolysis reactions. When you are using this chemical, please be cautious about it as the following:
It is toxic in contact with skin and if swallowed. And it is also toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. If you want to contact this product, you must wear suitable protective clothing, gloves and eye/face protection. In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)  People can use the following data to convert to the molecule structure.
1. Smiles: c1(c(cccc1C)C)O;
2. InChI: InChI=1/C8H10O/c1-6-4-3-5-7(2)8(6)9/h3-5,9H,1-2H3. The following are the toxicity data which has been tested.

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
mammal (species unspecified) LC inhalation > 270mg/m3 (270mg/m3)   Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 20(4), Pg. 43, 1976.
mouse LD50 intraperitoneal 150mg/kg (150mg/kg)   National Technical Information Service. Vol. AD691-490,
mouse LD50 intravenous 80mg/kg (80mg/kg) BEHAVIORAL: GENERAL ANESTHETIC

BEHAVIORAL: SLEEP
Journal of Medicinal Chemistry. Vol. 23, Pg. 1350, 1980.
mouse LD50 oral 450mg/kg (450mg/kg) BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY)

BEHAVIORAL: CONVULSIONS OR EFFECT ON SEIZURE THRESHOLD

LUNGS, THORAX, OR RESPIRATION: OTHER CHANGES
Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 20(4), Pg. 43, 1976.
mouse LD50 skin 920mg/kg (920mg/kg)   Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 18(2), Pg. 58, 1974.
rabbit LD50 oral 700mg/kg (700mg/kg) BEHAVIORAL: ATAXIA

BEHAVIORAL: MUSCLE CONTRACTION OR SPASTICITY)

LUNGS, THORAX, OR RESPIRATION: DYSPNEA
Hygiene and Sanitation Vol. 33(7-9), Pg. 329, 1968.
rabbit LD50 skin 1gm/kg (1000mg/kg)   Industrial Hygiene Foundation of America, Chemical and Toxicological Series, Bulletin. Vol. 6, Pg. 1, 1967.
rat LD50 oral 296mg/kg (296mg/kg)   Gigiena Truda i Professional'naya Patologiya v Estonskoi SSR. Labor Hygiene and Occupational Pathology in the Estonian SSR. Vol. 8, Pg. 145, 1972.
rat LD50 skin 2325mg/kg (2325mg/kg) BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY)

BEHAVIORAL: CONVULSIONS OR EFFECT ON SEIZURE THRESHOLD

LUNGS, THORAX, OR RESPIRATION: OTHER CHANGES
Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 20(4), Pg. 43, 1976.
Octanol/Water Partition Coefficient:
log Kow= 2.36
Report:
The IUPAC name of 2,6-Xylenol is 2,6-dimethylphenol. With the CAS registry number 576-26-1, it is also named as 1-Hydroxy-2,6-dimethylbenzene. The product's categories are aromatic phenols; phenoles and thiophenoles. It is colorless to off-white crystalline solid with a sweet tarry odor. And this chemical is soluble in alcohol, ether, chloroform, benzene and alkali solution, very slightly soluble in cold water. In addition, it is stable, very flammable, and incompatible with oxidizing agents, acid chlorides, acid anhydrides, steel, copper, copper alloys, bases, acid chlorides. Furthermore, 2,6-Xylenol should be stored away from extreme heat and away from strong oxidizing agents.  The other characteristics of this product can be summarized as: (1)ACD/LogP: 2.40; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 2.4; (4)ACD/LogD (pH 7.4): 2.4; (5)ACD/BCF (pH 5.5): 39.41; (6)ACD/BCF (pH 7.4): 39.39; (7)ACD/KOC (pH 5.5): 482.78; (8)ACD/KOC (pH 7.4): 482.51; (9)#H bond acceptors: 1; (10)#H bond donors: 1; (11)#Freely Rotating Bonds: 1; (12)Index of Refraction: 1.54; (13)Molar Refractivity: 37.78 cm3; (14)Molar Volume: 120.4 cm3; (15)Polarizability: 14.97×10-24 cm3; (16)Surface Tension: 37.2 dyne/cm; (17)Enthalpy of Vaporization: 45.51 kJ/mol; (18)Vapour Pressure: 0.221 mmHg at 25°C; (19)Tautomer Count: 2; (20)Exact Mass: 122.073165; (21)MonoIsotopic Mass: 122.073165; (22)Topological Polar Surface Area: 20.2; (23)Heavy Atom Count: 9; (24)Complexity: 80.6. Preparation 2,6-Xylenol: Using phenol or orthocresol as raw material, then they have a gas phase catalytic reaction with methanol. Through distillation and purification, we can obtain the product and its purity is over 99%. Uses of 2,6-Xylenol: It is an intermediate for the manufacture of polyphenylene oxide and modified phenolic resins and phosphate esters. And it is also used in the production of hydraulic fluids, in halogenation and aminolysis reactions. When you are using this chemical, please be cautious about it as the following:
It is toxic in contact with skin and if swallowed. And it is also toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. If you want to contact this product, you must wear suitable protective clothing, gloves and eye/face protection. In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)  People can use the following data to convert to the molecule structure.
1. Smiles: c1(c(cccc1C)C)O;
2. InChI: InChI=1/C8H10O/c1-6-4-3-5-7(2)8(6)9/h3-5,9H,1-2H3. The following are the toxicity data which has been tested.

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
mammal (species unspecified) LC inhalation > 270mg/m3 (270mg/m3)   Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 20(4), Pg. 43, 1976.
mouse LD50 intraperitoneal 150mg/kg (150mg/kg)   National Technical Information Service. Vol. AD691-490,
mouse LD50 intravenous 80mg/kg (80mg/kg) BEHAVIORAL: GENERAL ANESTHETIC

BEHAVIORAL: SLEEP
Journal of Medicinal Chemistry. Vol. 23, Pg. 1350, 1980.
mouse LD50 oral 450mg/kg (450mg/kg) BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY)

BEHAVIORAL: CONVULSIONS OR EFFECT ON SEIZURE THRESHOLD

LUNGS, THORAX, OR RESPIRATION: OTHER CHANGES
Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 20(4), Pg. 43, 1976.
mouse LD50 skin 920mg/kg (920mg/kg)   Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 18(2), Pg. 58, 1974.
rabbit LD50 oral 700mg/kg (700mg/kg) BEHAVIORAL: ATAXIA

BEHAVIORAL: MUSCLE CONTRACTION OR SPASTICITY)

LUNGS, THORAX, OR RESPIRATION: DYSPNEA
Hygiene and Sanitation Vol. 33(7-9), Pg. 329, 1968.
rabbit LD50 skin 1gm/kg (1000mg/kg)   Industrial Hygiene Foundation of America, Chemical and Toxicological Series, Bulletin. Vol. 6, Pg. 1, 1967.
rat LD50 oral 296mg/kg (296mg/kg)   Gigiena Truda i Professional'naya Patologiya v Estonskoi SSR. Labor Hygiene and Occupational Pathology in the Estonian SSR. Vol. 8, Pg. 145, 1972.
rat LD50 skin 2325mg/kg (2325mg/kg) BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY)

BEHAVIORAL: CONVULSIONS OR EFFECT ON SEIZURE THRESHOLD

LUNGS, THORAX, OR RESPIRATION: OTHER CHANGES
Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. Vol. 20(4), Pg. 43, 1976.
Disposal Methods:
SRP: At the time of review, criteria for land treatment or burial (sanitary landfill) disposal practices are subject to significant revision. Prior to implementing land disposal of waste residue (including waste sludge), consult with environmental regulatory agencies for guidance on acceptable disposal practices.
Chemical Treatability of 2,6-Dimethylphenol; Concentration Process: Biological treatment; Chemical Classification: Phenols; Scale of Study: Unknown; Type of Wastewater Used: Pure compound (one solute in a solvent); Results of Study: 94.3% reduction based on chemical oxygen demand; rate of biodegradation 9 mg chemical oxygen demand/g hr (Activated sludge process).
Use and Manufacturing
Use and Manufacturing:
Methods of Manufacturing

The insertion of methyl groups into phenol to produce ... xylenols is a commercial process of considerable utility. The process commomly employed is methylation with methyl alcohol over a solid catalyst, generally a modified metal oxide, at temp in the range of 300-450 deg C. /Xylenols/
Orthoalkylation of phenol + methanol (coproduced with o-cresol)
U.S. Imports

(1981) 1.27X10+5 G (PRINCIPAL CUSTOMS DISTRICTS)
U.S. Production

(1977) AT LEAST 9.12X10+8 G
(1981) PROBABLY GREATER THAN 6.81X10+6 G
Usage:
Intermediate for the manufacture of polyphenylene oxide and modified phenolic resins and phosphate esters used in the production of hydraulic fluids, in halogenation and aminolysis reactions.
Environmental Fate and Exposure Potential
Environmental Fate/Exposure Summary:
TERRESTRIAL FATE: Based on a classification scheme(1), an estimated Koc value of 460(SRC), determined from a log Kow of 2.36(2) and a regression-derived equation(3), indicates that 2,6-dimethylphenol is expected to have moderate mobility in soil(SRC). Volatilization of 2,6-dimethylphenol from moist soil surfaces is expected to be an important fate process(SRC) given a Henry's Law constant of 6.7X10-6 atm-cu m/mole (4). 2,6-Dimethylphenol is not expected to volatilize from dry soil surfaces(3) based upon a vapor pressure of 0.274 mm Hg at 25 deg C(4). The rate of biodegradation obtained for 2,6-dimethylphenol in a screening test with an adapted activated sludge seed was 94.3% chemical oxygen demand after 5 days(6). Other dimethylphenols have been reported to degrade within 4 to 14 days from soil(7).
AQUATIC FATE: Based on a classification scheme(1), a Koc value of 460(SRC), determined from a log Kow of 2.36(2) and a regression-derived equation(3), indicates that 2,6-dimethylphenol is expected to adsorb very little to suspended solids and sediment in water(SRC). 2,6-Dimethylphenol is expected to volatilize from water surfaces(3,SRC) based upon a Henry's Law constant of 6.7X10-6 atm-cu m/mole(4). Estimated volatilization half-lives for a model river and model lake are 6 days and 49 days, respectively(3,SRC). According to a classification scheme(5), an estimated BCF of 37(3,SRC), from 2,6-dimethylphenol's log Kow(2), suggests bioconcentration in aquatic organisms is moderate(SRC). In humic waters, degradation by the reaction with peroxy radicals should ensue with a half-life on the order of hours(6). 2,6-Dimethylphenol is not expected to undergo hydrolysis in the environment due to the lack of hydrolyzable functional groups(3). Screening studies indicate that a loss of 94.3% chemical oxygen demand was obtained after 5 days(7). In addition, it has been reported that 2,6-dimethylphenol was readily degraded in St. Lawrence River water(8). Biodegradation under anaerobic conditions failed to occur in one study, time unspecified(9) and only 7% degradation occurred after 8 weeks in another study(10).
ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), 2,6-dimethylphenol, which has a vapor pressure of 0.274 mm Hg at 25 deg C(2), is expected to exist solely as a vapor in the ambient atmosphere. Vapor-phase 2,6-dimethylphenol is degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals(SRC); the half-life for this reaction in air is estimated to be 5.8 hours(SRC) from its rate constant of 6.60X10-11 cu cm/molecule-sec at 25 deg C(3). Atmospheric 2,6-dimethylphenol is known to be removed by rainwater(4). 2,6-Dimethylphenol has an absorption band at 268 nm (water), and a shoulder may extend over 290 nm, thus making it a candidate for direct photochemical degradation(5,6). Night-time degradation in urban areas should occur rapidly through reaction with atmospheric nitrate radicals, as rate constants for this reaction with phenolic compounds are approximately 250 times faster than with hydroxyl radicals(7,SRC).
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 Tianjin Funuoruizhong Science and Technology Development Co., Ltd. is an accumulation of research, production, procurement, export sales and service in a single high-tech businesses.Our organization which the main technical is organic synthesis and polymer synthesis has dedicated to the pharmaceutical intermediates, research growth and development of technology of oilfield chemicals, fine chemicals, contract manufacturing chemical recycleables import and export trade.                                 
NINGBO ASQ AUTO PARTS CO,.LTD:
For over two decades our factory has been manufacturing car components including tire valves,Website:http://www.asqauto.com, mufflers and many other vehicle parts, and has been regarded as a responsible partner with high-quality products by our customers. Later we embarked onto the production of aftermarket performance products such as mandrel-bent aluminum cold air intakes and strut bars, and also gains a reputation of high standard of quality and a reasonable price. We have the experience of customizing hundreds of models of cold air intakes and strut bars fitted to various car models. Absorbing the experience of manufacturing for several well-known tuning brands in the US before, with our production capabilities and quality workmanship, ASQ Auto was established with a goal to expand the 
Zhenjiang Xinhe Biotech Co.,Ltd:
Zhenjiang XinHe Biotech Co., Ltd is focused on R&D, production, sales and technical services for that integration from the private enterprise, Situated in historic and cultural city The expansion district of Jiangsu DingMao Zhenjiang, abuts Beijing-Shanghai railway, The Shanghai-Nanjing expressway and worldwide port - Zhenjiang Dagang port, likes beneficial physical position and convenient transportation. We are focused on biological reagents, pharmaceutical intermediates research, sales and technical services, we have many outstanding technical and management personnel, the entire examination method, advanced production equipment, therefore we can offer Fmoc-Amino Acidity and types, Boc-Amino acidity and types, Z-Amino Acidity and types, peptide coupling reagents and Fine items of chemic 
Shanghai baizhong Chemical Co., Ltd:
 
Millennium Specialty Chemicals Inc.:
 
Technology Center of Juhua Group:
 
ALPHA(SHIJIAZHUANG) CHEMICAL CO., LTD:
 
sichuan meishan tianhe chemical co.,ltd:
Situated in Meishan town of Sichuan province, Sichuan Meishan Tianhe Chemical Co.,Ltd is really a private manufacturer and seller of "chuanhe" anhydrous sodium sulphate,sodium carbonate,sodium sulphide and phosphate series. We produce wholesomeness 99min anhydrous sodium sulphate 250,000 tons each year regularly. Furthermore, we produce special specifications based on customers' needs.for example low pH-value(6/8), low swimming pool water/Ca-Mg content and Particle size: ≤ 10um (400-2500mesh).We sell our items throughout China, and export to Southeast Asia ,the center East, Africa and South Usa,that are highly considered by worldwide and domestic clients due to high wholesomeness and Good whiteness.Our idea is "Quality first, Credit priority, Excellent Service". We sincerely welcome Chin