Trichloro diphenyl

SYNS BENZENE, l,l -OXYBIS-, HEXACHLORO derivatives (9CI) ETHER, HEXACHLOROPHENYL HEXACHLORODIPHENYL ETHER HEXACHLO-RODIPHENYL OXIDE PHENYL ETHER, HEXACHLORO derivative (SCI) TRICHLORO DIPHENYL ETHER TRICHLORO DIPHENYL OXIDE... 

TRICHLORO-2,2-DI(4-METHOXYPHENYL)ETHANE see MEI450 TRICHLORO DIPHENYL ETHER see CDV175 TRICHLORO DIPHENYL OXIDE see CDV175 TRICHLORODODECYLSILANE see DYA800 TRICHLOROETHANAL see CDN550... 

Chlorinated dibenzo-ip-dioxins were prepared on the gram scale for use as toxicological standards, 2,7-Dichlorodi-henzo-p-dioxin was prepared by catalytic condensation of potassium 2-bromo-4-chlorophenate in 70% yield. Thermal condensation of the potassium salt of 2,4,4 -trichloro-2 -hydroxy diphenyl ether gave a mixture of the 2,8- and 2,7-dichlorodibenzo-p-dioxins which were separated by fractional recrystallization. 2,3,7,8-T etrachlorodibenzo-p-dioxin of 99.9- -% purity was prepared by catalytic condensation of potassium 2,4,5-trichlorophenate. An isomeric mixture of hexachlorodibenzo-p-dioxins was prepared by pyrolytic condensation of sodium 2,3,4,6-tetrachlorophenate. Chlorination of pentachlorophenol (containing < 0.07% tetrachlorophenol) in trichlorobenzene gave octachlorodi-benzo-p-dioxin in 80% yield contaminated by 5-15% heptachlorodibenzo-p-dioxin. Oxidative methods were used to produce octachlorodibenzo-p-dioxin at 99.9% purity. 

Trichloro-l,3-diphenyl-l//-1,2,4-triazepine has recently been synthesized in high yield by the reaction of tetrachlorocyclopropene with two moles of diphenylnitrilimine (81S322). 

Preparation of tetraphenylallene. (See Eq. 24.) To 200 ml of stirred liquid ammonia containing 7.28 gm (0.0255 mole) of 1,1,1-trichloro-2,2-diphenyl-ethane is added a solution of 0.0255 mole of potassium diphenylmethide in 300 ml of liquid ammonia. The mixture turns an orange-red color and then discharges immediately. After 1 hr the mixture is worked up to give 4.46 gm (75%) of l,l-dichloro-2,2-diphenylethene. 

Ethylenedioxybutyl)-3-trichloro-acetamido 1 cyclohexene, 58, 9, 11 Ethylene, 1,1-diphenyl-, 56, 32 Ethylene glycol, 56, 44 Ethylene glycol, phenyl-, 55, 116 Ethylene, tetramethyl-, 56, 35 Ethyl-or-fluoro-l-naphthaleneacetate, 57, 73 Ethyl 2-fluoropropanoate, 57, 73 3-Ethylhexane, 58, 3, 4 3-ETHYL-1-HEXYNE, 58,1, 2, 3, 4 Ethyl levuhnates, 5-substituted, 58, 81 Fthyl nitrite, 58, 113, 115 Ethyl V-nitroso-A-fp-tolylsulfonylmethyl)-carbamate, 57, 96 3-Ethyl-3-pentanol, 58, 25, 26, 31 3-Ethyl-3-pentyl alcohol, 58, 78 3-Ethyl-3-pentyl fluoride, 58, 78 Ethyl A -(p-tolylsulfonylmethyl)carbamate, 57, 95... 

Abbreviations PBDE = polybrominated diphenyl ether TCE = trichloroethylene PFOA = perfluorooctanoic acid TCP = trichloro-2-pyridinol. 

SiMoi204o)H4-a H20 12-Molybdo-silicic acid, 1 127, 128 Si(OC2H4Cl)Cl3 Silane, (2-chloro-ethoxy)trichloro-, 4 85, 86 Si02 Silica gel, 2 95 Si(OH)2(C8H5)2 Silanediol, diphenyl-, 3 62... 

The technique is simple and fast and allows control of the physical properties and particle size of the final product. Nevertheless, care must be taken in the selection and storage of glutaraldehyde to ensure reproducible enzyme immobilizations (123). Buffers containing reactive amino groups must be avoided. Severed other bifunctional reagents are more or less successful. The most common are hexamine diisocyanate, trichloro-t-triazine, and diphenyl-4,4 -dithio-cyanate-2,2 disulfonic acid (8, 124, 125). 

This sample should be examined visually for colour and the presence of tablet residues or excipients (often maize starch). The odour should be noted as tiiis may indicate the presence of alcohols, aldehydes, ketones, phenols, cyanide, ethchlorvynol, nicotine, etc. The following tests, details of which are given on p. 5, should be performed Trinder s test for salicylates, cresol-ammonia test for paracetamol, FPN reagent for phenothiazines, Fujiwara test for trichloro-compounds, and the diphenyl- nine test for oxidising agents. In addition, tiie Reinsch Test for heavy metals (p. 57) should be carried out, and a diluted, filtered extract examined by direct ultraviolet spectrophotometry for drugs with highyl values. 

SYNS AKARITOX AREDION 4-CHLOROPHEN-YL-2,4,5-TRICHLOROPHENYL SULFONE p-CHLOROPHENYL-2,4,5-TRICHLOROPHEN YL SULPHONE DUPHAR ENT 23,737 EMC 5488 MITION NIA 5488 POLACARITOX ROZTOZOL SULF0NE-2,4,4, 5-TETRACHL0R0DIPHENYLD TEDION TEDION V-18 2,4,4, 5-TETRACHLOOR-DIFENYI SULFON PUTCH) 2,4,4, 5-TETRACHLOR-DIPHENYL-SULFON (GERMAN) 2,4,4, 5-TETRACHLO-RODIPHENYL SULFONE 2,4,5,4 -TETRACHLORO-DIPHENYLSULPHONE 2,4,4, 5-TETRACLORO-DIFENIL-SOLFONE (ITALIAN) TETRADICHLONE TETRADIFON TETRADIPHON TETRAFIDON l,2,4-TRICHLORO-5-((4-CHLOROPHENYL)SULFONYL)-BENZENE V-18... 

This trichloro- derivative on treatment with cold water forms first the chloride of diphenyl arsenic acid ... 

Electrochemical reduction of l-methyl-2-oxo-5,6-diphenyl-l, 2-dihydropyrazine has been discussed in Section 6F (1096, 1097). Direct amination of the oxo group appears to be unexplored, and little is known of the action of phosphorus halides except that a number of 1-alkyl-3,5,6-trichloro-2-oxo-l,2-dihydropyrazines has been prepared from 1,4-dialkylpiperazine-2,5-diones and phosphorus pentachloride (853) Section 9A(4)]. 

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