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These residue contains a few percent by weight of xylenols as well as cresols and phenol. The main xylenols in such tar are the 3,5-, 2,4, and 2,3- isomers. 2,6-Xylenol is produced by methylation of phenol using methanol in the presence of metal oxide catalysts: [1] C 6 H 5 OH + 2 CH 3 OH → (CH 3) 2 C 6 H 3 OH + 2 H 2 O
With production >100,000 tons/y, it is the most important xylenol. The methylation is carried out by contacting gaseous phenol and methanol at elevated temperatures in the presence of a solid acid catalyst: [2] [3] C 6 H 5 OH + 2 CH 3 OH → (CH 3) 2 C 6 H 3 OH + 2 H 2 O
1,2,3,5-Tetrahydroxybenzene 142.026608 C9H6O2: Coumarin 146.036779 C9H8O2: Cinnamic acid 148.05243 C9H10O2: 2-Methoxy-4-vinylphenol, others 150.06808 C10H14O: Carvacrol 150.104465 C8H8O3: 4-Hydroxyphenylacetic acid, others 152.047344 C9H12O2: 4-Ethylguaiacol 152.083729 C7H6O4: Protocatechuic acid, others 154.026608 C8H10O3: Hydroxytyrosol ...
The Occupational Safety and Health Administration has set a permissible exposure limit at 5 ppm (22 mg/m 3) over an eight-hour time-weighted average, while the National Institute for Occupational Safety and Health recommends a limit of 2.3 ppm (10 mg/m 3).
The acidity of the methylene group in diphenylmethane is due to the weakness of the (C 6 H 5) 2 CH–H bond, which has a bond dissociation energy of 82 kcal mol −1 (340 kJ mol −1). [5] This is well below the published bond dissociation energies for comparable C–H bonds in propane , where BDE((CH 3 ) 2 CH–H)=98.6 kcal mol −1 , and ...
Diphenylmethanol is the organic compound with the formula (C 6 H 5) 2 CHOH. Also known as benzhydrol , it is a white solid and the parent member of a large class of diaryl alcohols. Preparation
synthetic vitamin E by methylation to give 2,3,6-trimethylphenol [3] antiseptics, such as amylmetacresol; a solvent for polymers. For example, polyaniline is cast from a solution of m-cresol to form a polyaniline film with a superior conductivity than polyaniline alone. This phenomenon is known as secondary doping. [4]
In female elephants, the two compounds 3-ethyl phenol and 2-ethyl 4,5 dimethylphenol have been detected in urine samples. [70] Temporal glands secretion examination showed the presence of phenol, m-cresol and p-cresol (4-methyl phenol) during musth in male elephants. [71] [72] [73] p-Cresol and o-cresol are also components of the human sweat.