4,4 -Dibromodiphenyl

Bromodiphenyl has been obtained along with some of the ortho derivative from the bromination of diphenyl.1 However, according to Schlenk,2 the product so obtained is contaminated with some p, -dibromodiphenyl which is very difficult to remove. Bamberger obtained j>-bromodiphenyl from the action of benzene on solid p-bromobenzene diazoanhydride.3 The method described in the procedure has recently been described in the literature.4... 

C6H4)279Br2. Four lines corresponding to 79Br were recorded in -dibromodiphenyl. The components of the fine structure which have been measured at 23°C have frequencies at 264.095, 265.960, 267.096, and 267.816 Mc/sec. Only the line located at 267.816 Mc/sec was considered. The forty per cent dose is about 5xl08 roentgens.13... 

Tolybrominated biphenyls category includes decabromobiphenyl (CAS 13654-09-6) decabromodiphenyl ether (CAS 1163-19-5) hexabromobiphenyl (CAS 59080-40-9) hexabromo-1,1 -biphenyl (CAS 36355-01-8) hexabromodiphenyl ether (CAS 36483-60-0) nonabromodiphenyl ether (CAS 63936-56-1) octabromobiphenyl (CAS 27858-07-7) octabromobiphenyl (CAS 61288-13-9) octabromodiphenyl ether (CAS 32536-52-0) p-bromodiphenyl ether (CAS 101-55-3) p,p -dibromodiphenyl ether (CAS 2050-47-7) pentabromodiphenyl ether (CAS 32534-81-9) polybrominated biphenyl (CAS 59536-65-1) polybrominated biphenyl mixture (CAS 67774-32-7) tetrabromodiphenyl ether (CAS 40088-47-9) and tri bromodiphenyl ether (CAS 49690-94-0). 

Kanbara has since generated a family of poly(iminoarene)s by reaction of 1,3-dibromo-benzene, 4,4-dibromodiphenyl ether, 2,6- and 3,5-dibromopyridines, 2,4-dibromothiophene, and l,l -dibromoferrocene with a variety of bifunctional arylamines [229]. In many cases, no polymer was obtained, but for polymerizations involving dibromobenzene and 2,6-dibromopyridine, materials with JVfn values of over 10,000 were obtained. Spectral data were provided for poly(2,6-aminopyridine) and a polymer made from dibromobenzene and a dia-rylamino sulfone. These authors have also investigated nickel catalysts for the polymerization of diamines with dichloroarenes, but the materials generated had molecular weights below 10,000 in most cases [230]. 

Reactions of tellurium tetrachloride and 4-iododiphenyl ether produced iodine. A phenoxatellurin could not be isolated from the reaction mixture1. 4-Bromodiphenyl ether and 4,4 -dibromodiphenyl ether did not react with tellurium tetrachloride2. 

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