Tetrachlorobis

Polymers have been prepared from nuclear substituted di-(4-hydroxyphenyl)-alkanes, of which the halogenated materials have been of particular interest. The symmetrical tetrachlorobis-phenol A yields a polymer with a glass transition temperature of 180°C and melting range of 250-260°C but soluble in a variety of solvents. 

As a result of the demand for flame-resistant resins, halogenated materials have been marketed. A typical example is the diglycidyl ether of tetrachlorobis-phenol A Figure 26.14). 

Thorium, (dimethylformamide)tetrakis(tropolone)-structure, 1, 98 Thorium, hexanitrato-structure, 1,101 Thorium, pentacarbonato-stereochcmistry, I, 99 Thorium, tetrachlorobis(octamethylpyro-phosphoramide)-structure, 1, 89... 

Nikolaides, E., B. Brunstrom, and L. Dencker. 1988. Effects of the TCDD congeners 3,3, 4,4 -tetrachlorobi-phenyl and 3,3, 4,4 -tetrachloroazoxybenzene on lymphoid development in the bursa of Fabricius of the chick embryo. Toxicol. Appl. Pharmacol. 92 315-323. 

Janz, D.M. and C.D. Metcalfe. 1991b. Nonadditive interactions of 2,3,7,8-TCDD and 3,3, 4,4 -tetrachlorobi-phenyl on aryl hydrocarbon hydroxylase indnction in rainbow trout (Oncorhynchus mykiss). Chemosphere 23 467-472. 

Figure S The structure of the monodinic form of frans-tetrachlorobis(tetramethylthiourea)tellurium(IV) (reproduced by permission from Acta Chem. Scand., Ser. A, 1975, 29,141)...

Figure 4. Gas chromatograms of parfait fraction FI from an unspiked control column (top left)y column 120 (top right), and one of the standards used to calibrate the chromatogram (bottom). Designated solutes are a, furfural by isophorone cy 1-chlorododecane dy quinoline ey BHT fy biphenyl gy 2y4-dichlorobiphenyl h, stearic acid i, 2y2, 5y5 -tetrachlorobi-phenyl /, anthraquinone and ky bis(2-ethylhexyl) phthalate.

Fig. 6.14 (a) Molecular structure of /rans-tetrachlorobis(tetramethyIthiourea)telluriuni(IV) in the monoclinic form. Note that the line Cl(4)—Te—Cl(2) approximates an axis for a peniagonal bipyramid if it is assumed that a lone pair occupies a position between S( I) and 0(3) (b). [In part from Esperas, S. George. J. W. Huscbyc. S. Mikalscn. 0. Ada Chem. Sccnd. J97S.29A, 141-148.]... 

Fig. 12. View of tetrachlorobis-2-[(5-amino-4-carboxamidinium)[l,2,3]triazole]copper-(II) molecule.

Tetrahydrofuran (THF) (80 mL, freshly distilled from sodium benzophenone ketyl) is added from a 250-mL Schienk flask to bis(acetonitrile)tetrachloro-molybdenum(IV) (20 g, 0.052 mole) in a 250-mL Schienk flask and the mixture is stirred rapidly for 2 hours to give a yellow suspension of tetrachlorobis-(tetrahydrofuran)molybdenum(IV). The complex is filtered through a Schienk filter, washed with THF (20 mL), and dried in vacuo (10 2 torr) at room temperature. The product is obtained as a microcrystalline orange-yellow powder in yields of 15-17 g, 63-71%. The product is not analytically pure. Anal. Calcd. for CbH1602C14Mo C, 25.1 H, 4.9. Found C, 26.5 H, 4.2. However, it is sufficiently pure for subsequent reactions. 

Tetrachlorobis(triphenylphosphine)tungsten(IV) (4.5 g, 53 mmole) and 1,2-bis-(diphenylphosphino)ethane (2.1 g, 5.3 mmole) are heated in toluene (50 mL, distilled from sodium) at 70° for 3 hours in a 100-mL flask carrying a reflux condenser. The resulting yellow-green solid is filtered using a Schlenk filter, washed with toluene (30 mL) and diethyl ether (30 mL), and dried (10 2 torr, 20°). Yield 2.4 g, 89% it is sufficiently pure for subsequent preparations. Anal. Calcd. for C26H24C14P2W C, 43.1 H, 3.3. Found C, 44.5 H, 3.6. 

Timerbaev, A.R., Rudnev, A.V., Semenova, O., Hartinger, C.G., Keppler, B.K. Comparative binding of antitumor indazolium [trani-tetrachlorobis(l/7-indazole)ruthenate(lll)] to serum transport proteins assayed by capillary zone electrophoresis. Anal. Biochem. 341, 326-333 (2005)... 

In the laboratory PCDTs have been prepared by reactions between PCBs, sulfur and aluminum chloride and by direct chlorination of dibenzothiophene [28-30]. The temperature strongly affects the formation of TeCDTs from tetra-chlorobiphenyls and sulfur. Temperatures used were 120,160,200, and 240°C. Reaction times of 5-50 h were tried. The chlorinated biphenyls (50-200 mg) with sulfur (20-100 mg) and A1C13 (a few mg) were heated in closed tubes in an oven constructed for this purpose. After cooling the mixtures were extracted with toluene. More chlorine cleaving occurred at higher temperatures. In the case of a mixture of 3,4,3, 4 -tetrachlorobiphenyl and 2,3,3, 4 -tetrachlorobi-... 

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