BBr3 Boron bromide

Boron Bromide. Approximately 30% of BBr3 produced in the United States is consumed in the manufacture of proprietory pharmaceuticals (qv) (7). BBr3 is used in the manufacture of isotopically enriched crystalline boron, as a Friedel-Crafts catalyst in various polymerization, alkylation, and acylation reactions, and in semiconductor doping and etching. Examples of use of BBr3 as a catalyst include copolymerization of butadiene with olefins (112) polymerization of ethylene and propylene (113), and IV-vinylcarbazole (114) in hydroboration reactions and in tritium labeling of steroids and aryl... 

BBr3, [ °B]Boron bromide, 22 219 BaF4PtS3CiiHi , Platinum(II), chlorotris-(dimethyl sulfide)-, tetrafluoroborate-(1-), 22 126... 

BC13, BBr3, and BI3 undeigo exchange reactions to yield mixed boron halides. Exchange reactions also occur with trialkyl, triaryl, trialkoxy, or triaryloxy boranes and with diborane. Anhydrous metal bromides and iodides can be prepared by the exchange reaction of the metal chloride or oxide and BBr3 or BI3 (21). 

Alkyl fluorides are the most reactive of the alkyl halides. Boron trichloride (BCI3), boron trifluoride (BF3), boron triiodide (BI3), and boron tribfomide (BBr3) all catalyze the reaction of alkyl fluorides and benzene, although they are ineffective catalysts for the analogous reaction of alkyl chlorides and alkyl bromides. reaction with mixed halides, the C—F bond reacts faster than the C—Cl, C—Br or C—I bond. This is consistent with the observed order of reactivity for alkyl halides with aluminum chloride (AICI3) ... 

A 3.09-g (10-mmol) sample of (CH3)3N BBr3 is treated with 11.5mL (100 mmol) of 4-methylpyridine, according to a procedure described elsewhere. The amount of tetrakis(4-methylpyridine)-boron(3 ) bromide sob-tained is 0.91 g or 1.46 mmol, which is 14.6% of theory. The melting point of this bromide salt is 254-255°C with decomposition (lit. 253-254°C with decomposition). The H NMR spectrum of this compound in DjO has peaks at 8.61 (broad), 8.17 (doublet), and 2.86 (singlet) ppm, respectively, downfield from internal DDS NMR reference. 

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