Tetrachloro-benzene

C56H4sBFftIrOPaSa, Triphenylphosphoniodithiocarboxylato-S,S -carbon-ylbis(triphenylphosphine)iridiumd) tetrafluoroborate, 46B, 1238 CssHy2C116CO2N2S8, Tetra-n-butylammonium bis(1,2,3,4-tetrachloro-benzene-5,6-dithiolato)cobaltate, 33B, 499... 

Dichloro- benzene 1,4- Dichloro- benzene 1,3,5- Trichloro- benzene 1,2,4- Trichloro- benzene 1,2,3- Tricholoro- benzene 1,2,4,5-Tetrachloro-benzene 1,2,3,4,-Tetrachloro-benzene Pentachloro- benzene Hexachloro- benzene... 

Soil. Lindane degraded rapidly in flooded rice soils (Raghu and MacRae, 1966). In moist soils, lindane biodegraded to (y-PCCH) (Eisner et al., 1972 Kearney and Kaufman, 1976 Fuhremann and Lichtenstein, 1980). Under anaerobic conditions, degradation by soil bacteria yielded y-BTC and a-BHC (Kobayashi and Rittman, 1982). Other reported biodegradation products include pentachlorocyclohexane, pentachlorobenzene, tetrachlorocyclohex-l-enes, and tetrachloro-benzenes (Moore and Ramamoorthy, 1984). Incubation of lindane for 6 wk in a sandy loam soil under flooded conditions yielded y-TCCH, y-2,3,4,5,6-pentachlorocyclohex-l-ene, and small amounts of 1,2,4-trichlorobenzene, 1,2,3,4-tetrachlorobenzene, 1,2,3,5-, and/or 1,2,4,5-tetrachloro-benzene (Mathur and Saha, 1975). Incubation of lindane in moist soil for 8 wk yielded the follow-... 

Plant. Degrades in plants to 4-hydroxy-2,5,6-trichloroisophthalonitrile (Hartley and Kidd, 1987), l,3-dicyano-4-hydroxy-2,5,6-trichlorobenzene, and l,3-dicarbamoyl-2,4,5,6-tetrachloro-benzene (Rouchaud et al., 1988). No evidence of degradation products were reported in apple foliage 15 d after application. The half-life of chlorothalonil was 4.1 d (Gilbert, 1976). 

Nonphotochemical Generation of Radical Anions of Aromatic Halides. The second method involved using an arene radical anion as a convenient electron donor. In order to avoid side reactions, discovered when lithium naphthalenide was employed, presumably arising from coupling reactions between the donor and radical derived from acceptor radical anion, lithium p,p -d -tert-butylbiphenylide (LiDBB) [46] was used as donor. The presence of the cert-butyl groups is known to prevent the side reactions encountered with naphthalene [46]. Treatment of 1 with LiDBB in THF gave the three isomers of tetrachloro-benzene as products as shown in Eq. 17. 

This method was also used to determine the polarization of the zf transition of 1,2,4,5-sym-tetrachloro-benzene (54) in durene. This work points out that an assignment of all the zf transitions as well as the relative order of the zf levels can be made from the lifetimes of the zf levels, the spectroscopy, and the knowledge of the polarization of one crucial zf transition. 

Beilstein Handbook Reference) AI3-01835 Benzene, 1,2,4,5-tetrachloro- Benzene tetra-chloride BRN 1618315 CCRIS 766 EINECS 202-466-2 HSDB 2733 NSC 27003 RCRA waste number U207 s-Tetrachlorobenzene. Crystals mp = 139.5° bp = 244.5° Xm = 232, 295 nm (cyclohexane) insoluble in H2O, poorly soluble in EtOH. soluble in Et20, CeHe, CHCI3, CS2. 

The structure of 4.18a shows that the two Cp Ru units are bonded to the carbazolyl ligand and are disposed in a trans fashion. Most remarkable is the interaction between the TRISPHAT anion and the cationic metal complex. There are two n-n interactions between one of the tetrachloro-benzene rings of A-TRISPHAT and the two t/ -Cp Ru units of two cationic metal complexes with (J = 3.55 (1) A a = 19.24°) for the C(13)-C... 

The word trap also expresses the fact that these point defects can frequently capture electronic excitation energy. Other well-studied X traps are those of pyrene in anthracene, with a trapping depth of AE= 59 cm b Naturally, there are also triplet X traps, e.g. in 1,2,4,5-tetrachloro-benzene, with AE = 21.3 cm . Host molecules can also act as X traps when they are perturbed not by foreign molecules but by a specific structural defect. Occasionally, in the literature a distinction is made between X and Y traps, depending on whether the lattice perturbation is caused by a structural defect in the crystal (Y trap) or by a foreign molecule (X trap). Plastic deformation of crystals can also produce discrete trapping states, for example in... 

Electron diffraction studies of hexachlorobenzene 1, 2,4, 5-tetrachloro-benzene and orfAo-dibromobenzene show that these molecules are planar ... 

No thiolate substitution of p-dichlorobenzene, 1,2,4,5-tetrachloro-benzene, or pentachlorophenylanisole in alcohol was observed Substitution of 2,3,4- and 2,4,5-trichlorobenzonitrile, 2,3-, 2,5- and 3-4-dichlorobenzonitrile and o- and p-chlorobenzonitriles with sodium hydrogen sulphide in liquid ammonia afforded the cyanothiophenols. Preferential replacement of the p-Cl was observed. Meto-chlorobenzo-nitrile did not undergo nucleophilic substitution under these conditions, but was rather hydrolysed by the water present in the NaSH . ... 

The other system commences from 1,4-dinitro tetrachloro benzene 369 (Reaction scheme 246). Key intermediate is tetrafluoro terephthalo dinitrile 368 [764], from which the remodeling to tetrafluoro-4-methylbenzylalcohol 363 sets out. This route is characterized by several reduction steps. 

Phase transfer catalysts were used for nucleophilic displacement reactions of activated leaving groups by hydroxyfurazanyl anions. For example, tetrachloro-pyrazine was found to react with hydroxyfurazans in benzene/Na2C03/tetraalkyl-ammonium salts giving products of mono- or disubstitution (Scheme 173) (94MI1). The course of the reaction depends on the ratio of the reactants and the nature of the ammonium salt. 

Ethyl 1//-azepine-1-carboxylate (1), on treatment with 3,4,5,6-tetrachloro-l,2-benzoquinone in benzene at room temperature, deposits a mixture of the [6 4- 4] 7t-adduct 29, the expected [2 + 4] 7T-adduct 30, and the unexpected regioisomer 31, the product of a rare C2-C3 cycloaddition.265 The [6 + 4] adduct 29 is thermally unstable and rearranges in high yield (63%) to adduct 31 in refluxing benzene. Cycloaddition fails with the more electron-rich 1,2-naph-thoquinone. 

The isomeric pyridazino[4,5-6]azepine 19 is obtained directly during the decomplexation of the [4 + 2] adduct 17 formed from tricarbonyl(ethyl +17/-azepine-l-carboxylate)iron and 1,2,4,5-tetrazine-3,6-dicarboxylate, with trimethylamine A-oxide.113 Surprisingly, decomplexation of adduct 17 with tetrachloro-l,2-benzoquinone yields only the dihydro derivative 18 (71 %), aromatization of which is achieved in high yield with trimethylamine A-oxide in refluxing benzene. 

The benzene complexes have silver bound rf to two benzene rings in the perchlorate but only to one in the tetrachloro aluminate (Figure 4.31), while in the COT complex, each silver is bound to two double bonds in one molecule. 

Mizutani and coworkers57a confirmed the presence of polychloro(methylsulfonyl)biphenyls (159-170) as sulfur-containing metabolites of chlorobiphenyls (Cl-BP) in the feces of mice based on both GLC-mass spectrometry and chemical derivatization. In some cases comparison with authentic samples (161 and 162) was also made. When preparing 161 and 162,2,5-dichloro-3-(methylsulfonyl)aniline, 2,5-dichloro-l-iodo-3-(methylsulfonyl)benzene and 2,2, 5,5 -tetrachloro-3,3 -bis(methyl-sulfonyl)biphenyl were also obtained and their four peak El mass spectra reported572. Similar data were given for the corresponding 4-substituted intermediates, which were involved in the preparation of 162. Also 2,4, 5-trichloro-2 -(methylsulfonyl)-biphenyl was prepared and its four peak mass spectra given. Metabolites 163 and 164 were also identified by comparison with the authentic standards. 

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