Bis- tetrabromo

NR, No Rating HBCD, hexabromocyclododecane EBTPI, ethylene bis(tetrabromo-phthalimide) TBBA, tetrabromobisphenol-A DBDPO, decabromodiphenyloxide BSIDAN, octabromotrimethylphenylindan PBB-PA, poly(pentabromobenzylacrylate) Dechlorane, 2 mol hexachlorocydopentadiene + 1 mol cyclopentadiene. 

Chemical Name Ethylene bis-tetrabromo phthalimide Form Yellow powder % Br 67... 

Since the technology is still developing, the industry has not yet focused its choice on one or two leading organo-bromine compounds. Rather, many manufacturers and many users of these flame retardants report serious interest in a wide variety of structures. Those most frequently mentioned in the technical literature, in approximate order of importance, are [2, 19, 21, 22, 25, 26], as follows decabromo diphenyl oxide, ethylene bis(tetrabromo phthalimide), tetradecabromo diphe-noxy benzene, ethylene bis(dibromo norbornane dicar-boximide), octabromo diphenyl oxide, hexabromo cyclo dodecane, tetrabromo dipentaerythiitol. In Europe, the organo-bromine compounds mentioned are quite different, mostly based on ethers of tetrabromo bisphenol A and while Europeans are more concerned about possible toxicity, paradoxically they are more likely to use polybrominated biphenyls, which would be taboo in the US [2, 28]. 

Chemical Naae Ethylene bis-tetrabromo phthaliaide Fora Yellow powder t Br 67... 

An unusual one-pot intramolecular sulfoxide alkylation-elimination reaction was found by Gibson et al. <2001SL712>. These authors found that treatment of 459 with potassium bis-trimethylsilylamide resulted in a ring closure to 460 in acceptable yield. Furthermore, Batori and Messmer found an effective method for preparation of [l,2,3]triazolo[l,5- ]pyrimidinium salts <1994JHC1041> oxidative cyclization of hydrazones 461 by 2,4,4,6-tetrabromo-2,5-cyclohexadienone gave rise to the quaternary salts 462. Under certain reaction conditions, the formation of 6-bromo-salts 462 (R6 = Br) was also experienced. As neither the starting compound nor the quaternary triazolopyridinium salt underwent bromination in this position, the authors assumed that this bromination process occurred on one of the intermediates in the course of the above-mentioned cyclization reaction. 

In the conversion of 3,4,5,6-tetrabromo-l,2-bis(bromomethyl)benzene into the tetrabromoisoindole (Scheme 5.4), the bisalkylation of the primary amine in the First step of the reaction is promoted by the addition of benzyltrimethylammonium methoxide [22]. 2-Chloromethylpyridine reacts with a series of a,co-diaminoalkanes, as well as 1,2-diaminobenzene, to produce Af V -dialkylated and N,N,N N -tctra-alkylated products [23]. 

Eriksson P, Jakobsson E, Fredriksson A. 1998. Developmental neurotoxicity of brominated flame-retardants, polybrominated diphenyl ethers, and tetrabromo-bis-phenol A. Organohalogen Compounds 35 375-377. 

Fire resistant polymers were obtained from brominated epoxynovolak resin, BPA/DC prepolymer, BMI, Zn acetate and benzoyl peroxide [103] or from an oligo-aspartimide (BMI-diamine reaction product), BPA/DC, 2,2-bis(3,5-dibromo-4-hydroxyphenyl)propane (i.e. Tetrabromo-Bisphenol A) and 2-ethyl-4-methylimi-dazole [104]. A mixture of BPA/DC, BMI and epoxide resin with brominated polycarbonate, copoly[oxy-2,6-dimethylphenylene)-(oxy-2,3,6-trimethylphenylene)] and a catalyst was also suggested [105],... 

A blue tetrabromo derivative has also been prepared [65JCS3785 76JCS(P1)2353]. Nuclear magnetic resonance spectra showed that this is the 2,4-bis(dibromomethyl)benzodiazepinium bromide a corresponding hexabromo derivative was obtained by bromination of 7,8-dibromo-2,4-dimethyldihydrodiazepine [76JCS(P1)2353]. When either of these polybromo derivatives was treated with excess bromine in acetic acid, yellow products were obtained that, from analysis and NMR spectra, appeared to be 3,7,8-tribromo-2,4-bis(tribromomethyl)-3//-benzodiazepine.This can be reduced catalytically to give 7,8-dibromo-2,4-bis(dibromomethyl)benzodiazepine [76JCS(P1)2353],... 

Quite recently, this most sought after prize was won A group ofworkers succeeded in synthesizing a stable compound containing a -Si Si- triple bond. Sekiguchi and cowork-ers isolated l,l,4,4-tetrakis[bis(trimethylsilyl)methyl]-l,4-diisopropyl-2-tetrasilyne from reaction of 2,2,3,3-tetrabromo-1,1,4,4-tetrakis[bis(trimethylsilyl)methyl]- 1,4-diisopropyl-tetrasilane with four equivalents of potassium graphite in tetrahydrofuran (equation 6). ... 

Br3CoN40C4Hig H2O, Cobalt(III), aquabro-mobis( 1,2-ethanediamine)-, dibromide, cis-, monohydrate, 21 123 Br4GaNCgH2o, Gallate(l - ), tetrabromo-, tetraethylammonium, 22 141 Br4GaNCi6H3g, Gallate(l - ), tetrabromo-, tetrabutylammonium, 22 139 Br4H26Ng02Rh2, Rhodium(III), di- jL-hy-droxo-bis[tetraamine-, tetrabromide, 24 226... 

Tetrabromo-5,6-dimethylbenzene and l,3-dichloro-2,4,5,6-tetrafluorobenzene react with dimethylchlorosilane under Barbier conditions to yield the tetrakis and bis(dimethylsilyl)-substituted derivatives, respectively. 

With one equivalent of NBS, the 4-bromide 117 gives a mixture of 2,4- and 2,5-dibromo derivatives in a 54 46 ratio. Further bromination of this mixture with 1 equivalent of NBS gives 2,4,7-tribromo-l,8-bis(dimethylamino)naphthalene as the only product. An attempt to convert it to a tetrabromo derivative by introducing the fourth bromine atom at position 5 was unsuccessful52. 

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