M Dibromobenzene

This procedure may be employed for m-chlorobromobenzene, b.p. 191-194° from tn chloroaniline m-dibromobenzene, b.p. 215-217°, from m-bromoaniline and o-bromoanisole, b.p. 114 116°/29 mm. from o anisidine (the sulphuric acid washing is omitt in the last example). 

Preliminary experiments indicate that the accumulation coefficient of o- and m-dibromobenzene is about 200, and the excretion half-Tife is approximately 18 h. 

The synthesis of phenylene R type systems via the proposed route afforded two materials which had both final Tg s above the 350°F limit and initial Tg s which were at or below room temperature. The two systems which offered the most desirable properties were those based on resorcinolAg-dibromobenzene and hydroquinone/m-dibromobenzene. Of the two, the hydroquinone system offered a lower initial softening temperature while also providing a cured Tg above 200°C. For this reason the product from hydroquinone and m-dibromobenzene was chosen as the candidate system for future work. 

TRINITROBENZENE m-DIBROMOBENZENE m-CHLORONITROBENZENE o-CHLORONITROBENZENE p-CHLORONITROBENZENE tn-D I CHLOROBENZENE o-DICHLOROBENZENE p-DI CHLOROBENZENE m-DIFLUOROBENZENE o-DIFLUOROBENZENE p-DIFLUOROBENZENE m-DI NITROBENZENE o-DINITROBENZENE p-DINITROBENZENE BROMOBENZENE MONOCHLOROBENZENE m-CHLOROPHENOL o-CHLOROPHENOL p-CHLOROPHENOL... 

Dinitro-2,4-dibromobenzene, almost col ndls or yellowish-grn pits (from ale), mp 83° prepd by nitrating either m-dibromobenzene or l-nitro-2,6-dibromobenzene (Ref 3)... 

Dinitro 4,6-dibromobenzene, mp 117° yel dimorph stable form, rhmb crysts, d 2.295 sol in common solvs and mecastable form, monoclinic prisms (from a cooled saturated in eth + a little ale or by seeding a saturated soln in eth acet) prepd by nitrating m-dibromobenzene or l-nitro-2,4-dibromo-benzene with mixed acid (Ref 5)... 

Photocatalytically active polymer having acridine units in the backbone was synthesized by the polycondensation of 3,6-diaminoacridine (proflavine) as a diamine and m-dibromobenzene (Scheme 13) [68]. Mullen and coworkers synthesized a series of novel poly(imino ketone)s via Pd-catalyzed polycondensation of aromatic dichloro or dibromo ketones with various aromatic diamines (Scheme 14) [69]. The Mw values were in the range of 19500-474 500. The FT-IR spectra of the obtained polymer revealed that in the solid state intermolecular and intramolecular hydrogen bonding (N-H 0=C)... 

Aromatic primary monoamine such as aniline serves as a difunctional monomer for Pd-catalyzed amination polycondensation to afford poly(triarylamine)s. For example, m-dibromobenzene [71] or 2,7-dibromo-fluorenes [72] reacted with aniline derivatives (Scheme 16). In these polymerizations, P(f-butyl)3 was an effective ligand of Pd2(dba)3 in a manner similar to the amination of aryl dibromides with secondary diamines. The Mw values were in the range of 9000-37 700. 

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