Chloro hydroquinone

Obtained by reaction of propionic acid with 2-chloro-hydroquinone [6507] by known methods [6508-6510]. 

Effect of amount of bisphenols on the properties of MCLCPs based on chloro-hydroquinone and terephthalic acid... 

Researchers at Du Pont used hydroquinone asymmetrically substituted with chloro, methyl, or phenyl substituents and swivel or nonlinear bent substituted phenyl molecules such as 3,4- or 4,4 -disubstituted diphenyl ether, sulfide, or ketone monomers. Eor example,... 

A. 2-Chloro-2,3,3-trijluorocyclobutyl acetate (Note 1). A mixture of 1.0 g. of hydroquinone, 3 drops of a terpene inhibitor (Note 2), and 140 g. (1.63 moles) of inhibited redistilled vinyl acetate (Note 3) is placed in a 400-ml. high-pressure shaker tube lined with stainless steel (Note 4). The shaker tube is closed,... 

A solution of 100 mg. (0.41 mmole) of 4,4 -dimethoxybibenzyl (Note 1) in 1.5 ml. of anhydrous dioxane (Note 2) was placed in a 10-ml. round-bottomed flask. To this was added 103 mg. (0.45 mmole) of 2,3-dichloro-5,6-dicyano-l,4-benzoquinone (DDQ Note 3) dissolved in 1.5 ml. of anhydrous dioxane. The flask was fitted with a reflux condenser and heated in an oil bath at 105° for 18 hours. The solution, which was initially deep green, became pale yellow as the hydroquinone crystallized out. The mixture was cooled, and the solid was filtered off. It was washed with 1 ml. of warm benzene followed by 6 ml. of warm chloro-... 

AI3-00040, see Cyclohexanol AI3-00041, see Cyclohexanone AI3-00045, see Diacetone alcohol AI3-00046, see Isophorone AI3-00050, see 1,4-Dichlorobenzene AI3-00052, see Trichloroethylene AI3-00053, see 1,2-Dichlorobenzene AI3-00054, see Acrylonitrile AI3-00072, see Hydroquinone AI3-00075, see p-Chloro-rrr-cresol AI3-00078, see 2,4-Dichlorophenol AI3-00085, see 1-Naphthylamine AI3-00100, see Nitroethane AI3-00105, see Anthracene AI3-00109, see 2-Nitropropane AI3-00111, see Nitromethane AI3-00118, see ferf-Butylbenzene AI3-00119, see Butylbenzene AI3-00121, see sec-Butylbenzene AI3-00124, see 4-Aminobiphenyl AI3-00128, see Acenaphthene AI3-00134, see Pentachlorophenol AI3-00137, see 2-Methylphenol AI3-00140, see Benzidine AI3-00142, see 2,4,6-Trichlorophenol AI3-00150, see 4-Methylphenol AI3-00154, see 4,6-Dinitro-o-cresol AI3-00262, see Dimethyl phthalate AI3-00278, see Naphthalene AI3-00283, see Di-rj-butyl phthalate AI3-00327, see Acetonitrile AI3-00329, see Diethyl phthalate AI3-00399, see Tributyl phosphate AI3-00404, see Ethyl acetate AI3-00405, see 1-Butanol AI3-00406, see Butyl acetate AI3-00407, see Ethyl formate AI3-00408, see Methyl formate AI3-00409, see Methanol AI3-00520, see Tri-ocresyl phosphate AI3-00576, see Isoamyl acetate AI3-00633, see Hexachloroethane AI3-00635, see 4-Nitrobiphenyl AI3-00698, see IV-Nitrosodiphenylamine AI3-00710, see p-Phenylenediamine AI3-00749, see Phenyl ether AI3-00790, see Phenanthrene AI3-00808, see Benzene AI3-00867, see Chrysene AI3-00987, see Thiram AI3-01021, see 4-Chlorophenyl phenyl ether AI3-01055, see 1.4-Dioxane AI3-01171, see Furfuryl alcohol AI3-01229, see 4-Methyl-2-pentanone AI3-01230, see 2-Heptanone AI3-01231, see Morpholine AI3-01236, see 2-Ethoxyethanol AI3-01238, see Acetone AI3-01239, see Nitrobenzene AI3-01240, see I idine AI3-01256, see Decahydronaphthalene AI3-01288, see ferf-Butyl alcohol AI3-01445, see Bis(2-chloroethoxy)methane AI3-01501, see 2,4-Toluene diisocyanate AI3-01506, see p,p -DDT AI3-01535, see 2,4-Dinitrophenol AI3-01537, see 2-Chloronaphthalene... 

Co-exposures 4,4 -Methylene bis (2-methylaniline) (2B) Magenta (2B) Safranine T or/ oNitrotoluene (3) 2,5-Diaminotoluene (3) Aniline (3) ori/io-Amino-azotoluene (2B) Multiple ejqjosures including 4-chloro-o/t/io-toluidine and 4-chloroacetyl-or/Zio-toluidine A/ Acetyl-or//io-toluidine 6-Chloro-or//io-toluidine 4-Chloro-or//io-toluidine (2A) Aniline (3) Hydroquinone (3) Toluene (3) Carbon disulfide Sulfur Benzothiazole 4-Aminobiphenyl (contaminant) (1) 2-Mercaptobenzothiazole (Ward et al, 1996) (Proprietary chemical) Aniline (3) 2-Mercaptobenzothiazole Phenyl-p-naphthylamine (3)... 

Trichioro-l,lf-hydroquinone, AF28 Trichloroisocyanuric acid, AB12 Trichloromethane, AA08 1,1,1-Tri chloro-2-methyl-2-propanol, AC97 Trich1oronitromethane, AA03 N-(2,, 6-Tr chlorophenyl) methacrylamide, AQ84... 

In the case of semiconductor assisted photocatalysis organic compounds are eventually mineralized to carbon dioxide, water, and in the case of chlorinated compounds, chloride ions. It is not unusual to encounter reports with detection of different intermediates in different laboratories have been observed. For example, in the degradation of 4-CP the most abundant intermediate detected in some reports was hydroquinone (HQ) [114,115,123], while in other studies 4-chloro-catechol, 4-CC (3,4-dihydroxychlorobenzene) was most abundant [14,116-118, 121,163]. The controversy in the reaction intermediate identification stems mainly from the surface and hydroxyl radical mediated oxidation processes. Moreover, experimental parameters such as concentration of the photocatalyst, light intensity, and concentration of oxygen also contribute in guiding the course of reaction pathway. The photocatalytic degradation of 4-CP in Ti02 slurries and thin films... 

GC-MS and HPLC analyses of electrolyzed solutions allowed the detection of aromatic intermediates such as p-benzoquinone and nitrobenzene for aniline, 4-chlorocatechol for 4-chlorophenol, 4-chlorophenol, 4-chlorocatechol, hydroquinone, and p-benzoquinone for 4-CPA, 4-chloro-o-cresol, mehylhy-droquinone, and methyl-p-benzoquinone for MCPA, 2,4-dichlorophenol, 4,6-dichlororesorcinol, chlorohydroquinone, and chloro-p-benzoquinone for 2,4-D, and 2,4,5-trichloro-phenol, 2,5-dichlorohydroquinone, 4,6-dichlororesorcinol, and 2,5-dihydroxy-p-benzoquinone for 2,4,5-T. In general, these by-products persisted in solution while the initial pollutant was degraded. 

The effect of the halogen substituent (fluoro, chloro, bromo and iodo) on the yield and mechanism of 4-halophenol photolysis was investigated by Durand et al. [24], Transient spectroscopy in aerated aqueous solutions indicated the formation of p-benzoquinone O-oxide from each derivative except 4-iodophenol for which no transients were detected p-benzoquinone and hydroquinone were found as photoproducts for all four compounds. It was concluded that the carbene mechanism was valid for the whole series. Under continuous irradiation, the 4-halophenol degradation quantum yields were determined to be

fluorescence lifetimes decreased in the same order, from 2.1 ns for 4-fluorophenol to 0.4 ns for 4-chlorophenol and < 0.1 ns for 4-bromophenol. 

Theophylline, caffeine, aminophylline, theobromine, p-hydrocyethyltheophylline, phenylbutazone, hydro-chloro-thiazide, acetominophen Fluvoxamine and possible isomers Hydroquinone and ethers Serotonin and metabolites... 

A reaction vessel equipped with a Dean-Stark decanter was charged with 10 parts of the condensation polymer of 2,2-bis(hydroxymethyl)propionic acid having a Mn of 2920 daltons, a Mw of4280 daltons, and a PDI of 1.47. This mixture was then treated with tin(di(chloro-dimethylsiloxy)-tin chlorodimethylsilane) (0.25 parts), ethyl acrylate (100 parts), and hydroquinone (0.05 parts). The mixture was then heated to between 92°C and 95°C so that the amount of distillate to the decanter was 15 to 20 parts per hour. Fresh ethyl acrylate was added to the reaction vessel as needed while the reaction continued for 20 hours. 

Quinone 239 adds hydrogen chloride to give the 6-chloro compound after subsequent oxidation the 7-chloro isomer is obtained as a by-product (870PP249). Reactions with pyridine have been described (58MI3 71JMC1029). With dienes, adducts are formed that can be isomerized with acid into hydroquinones, which can be reoxidized with silver oxide to quinones (67JHC133 73JCS(P 1)2374). 

For fiber studies polyester BB1 was chosen. A method to measure birefringence developed by Yang and co-workers (18) was applied on polymer BB1 fibers and showed no dependence on DR, but remained constant 0.32 within experimental error. Similar observations were made by McIntyre and co-workers with a somewhat similar LC co-polyester with chloro instead of phenyl-hydroquinone and 25 mol% 4,4 -dicarboxydiphenylether (13). 

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