3-phenoxy toluene

Diphenyl ether m-phenoxy toluene Aroma Heat Transfer Fluids Agrochemical C (Het) 1000-10000 CR... 

This is another low volume perfume chemical made from p-cresol where the -OH group has been replaced by a -OCeHs group. It has a very powerful odor of the hyacinth rose type. Also used as a germicide. World demand is not more than 50 tpa. However, it has been reliably learned that Sumitomo Chemical Co., Japan, has developed a catalyst to convert p-phenoxy toluene to / -phenoxy benzaldehyde for a new type of agrochemical. 

Traditionally m-phenoxy benzaldehyde is manufactured from benzaldehyde via bromination, and phenol. However, synthesis of this important agrochemical intermediate from meto-cresol via meto-phenoxy toluene oxidation has now become commercially more attractive. Sumitomo Chemicals, Japan has an excellent technology for making meta-phenoxy benzaldehyde from m-cresol as follows ... 

Dinltro-benzoate Phenyl-ureldo Acid p-Toluene- sulphonate 2 4-Dlchloro-phenoxy-acetate a-Napbthyl-ureldo Acid Phthalyl Derivative... 

Occupational and environmental exposure to chemicals can take place both indoors and outdoors. Occupational exposure is caused by the chemicals that are used and produced indoors in industrial plants, whereas nonoccupa-tional (and occupational nonindustrial) indoor exposure is mainly caused by products. Toluene in printing plants and styrene in the reinforced plastic industry are typical examples of the two types of industrial occupational exposures. Products containing styrene polymers may release the styrene monomer into indoor air in the nonindustrial environment for a long time. Formaldehyde is another typical indoor pollutant. The source of formaldehyde is the resins used in the production process. During accidents, occupational and environmental exposures may occur simultaneously. Years ago, dioxin was formed as a byproduct of production of phenoxy acid herbicides. An explosion in a factory in... 

The most surprising observation from low temperature reactions was the formation of adducts between good donor solvents (Tetralin, octahydrophenanthrene, tetrahydroquinoline) and acceptor radicals. The resulting adducts were not of a single predominant structure. In particular, several isomers of toluene-Tetralin were formed as well as di-Tetralin. Several of these reactions were done with D -Tetralin which permitted the firm identification of the Tetralin moiety in the adducts. GLC-MS studies indicated that the Tetralin may be bonded to phenyl, benzyl, benzyloxy- or phenoxy-groups, depending on the acceptor used. 

Commercial PCB mixtures frequently contain impurities that may contribute to the 2,3,7,8-TCDD toxic equivalency factor. These impurities may include other PCBs, dioxins, dibenzofurans, naphthalenes, diphenyl ethers and toluenes, phenoxy and biphenyl anisoles, xanthenes, xanthones, anthracenes, and fluorenes (Jones etal. 1993). PCB concentrations in avian tissues sometimes correlate positively with DDE concentrations (Mora et al. 1993). Eggs of peregrine falcons (Falco peregrinus) from California, for example, contained measurable quantities of various organochlorine compounds, including dioxins, dibenzofurans, mirex, hexachlorobenzene, and / ,//-DDE at 7.1 to 26.0 mg/kg FW PCB 126 accounted for 83% of the 2,3,7,8-TCDD equivalents, but its interaction with other detectable organochlorine compounds is largely unknown (Jarman et al. 1993). 

Amino Add MJP. Benzoate 3 5-Dinltro-benzoate Phenyl-ureido Add P-Toluene- sulphonate 2 4-Diehloro-phenoxy-acetate a-Naphthyl-ureldo Add Phthalyl Derivative... 

Phenoxy Radicals in Solution. Benzene, toluene, or dichloromethane solutions of syringol compounds were placed in 4 mm. o.d. quartz EPR tubes and frozen. A small amount of Pb02 was placed in the tube, which was then thawed and placed in the EPR cavity. Identical spectra were also obtained by using K3Fe(CN)6 (alkaline) or Ce(HS04)4 (acidic) as the oxidants. 

Castellan, A., Vanucci, C., Bous-Laurent, H., "Photochemical Degradation of Lignin Through a C-0 Bond Cleavage of Non-phenolic Benzyl Aryl Ether Units. A Study of the Photochemistry of a(2 ,4 -Trimethyl-Phenoxy)-3,4 Dimethoxy Toluene.", Hohforschmg, 1987, 41(4), 231. 

To a solution of cholesterol (0.77 g, 2 mmol) in dichloromethane (10 ml) were added pyridine (0.6 ml, 8 mmol) and phenoxy thiocarbonyl chloride (0.4 ml, 2.2 mmol). After 2 h, methanol (1 ml) was added, and the mixture obtained was washed with 1 M hydrochloric acid solution twice, and dried over Na2S04. After removal of the solvent, the residue was recrystallized from acetone to give phenyl thiocarbonate in 95% yield. Then, (Me3Si)3SiH (0.7 ml, 2.2 mmol) and AIBN (50 mg, 0.5 mmol) were added to the solution of the phenyl thiocarbonate (0.75 g, 1.5 mmol) in toluene (20 ml) and the obtained mixture was heated at 80 °C for 2 h under nitrogen atmosphere. After the reaction, the solvent was removed and the residue was recrystallized from acetone to give cholest-5-ene in 94% yield [14]. 

Figure 7.6. Absorption spectra of 6-phenoxy-iV-methylanthrapyridone in toluene (C = 1.53 x 1(T4 mol/liter) (1, 2)37 and 2-methoxy-4-methyl-6-phenoxyanthrapyridine in toluene (C = 4.36 x 10 5 mol/ liter) (3, 4)39before (1,3) and after (2, 4) UV irradiation.

Figure 7.8. Absorption spectra of 6-phenoxy-5,12-naphthacenequinone in toluene (C - 1.02 x 10 4 mol/liter)43 before (1) and after (2) irradiation (Xtxc = 405 nm).

A comparative study of the photochromic transformations for 6-phenoxy-5,12-naphthacenequinone in toluene and polymer matrix showed that the value of the quantum yields was unchanged with a polymer binder in place of toluene. 61 Quantum yields for direct and back photoreactions were equal to cpB= 0.3 and (Pa = 0.005 under UV light and q>A = 0.005 under visible irradiation. 

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