Generation of bromine

The in situ generation of bromine from H202 and HBr provides an extremely versatile indirect method for oxidizing toluenes and higher alkylbenzenes. It is... 

When a molecule is irradiated, particularly with ultraviolet light, some bonds within the molecule can absorb this energy and undergo homolyt-ic cleavage to generate free radicals. These reactions include the formation of alkoxyl (RO ) radicals from alkyl hypoiodites (RO) or nitrites (RONO) or the generation of bromine atoms from bromine or A-bro-mosuccinimide. 

Potassium bromate, KBrOa, and hydrobromic acid are used in the in situ generation of bromine for the oxidation of primary alcohols to esters [742]. 

A recent work shows that an improved, cost efficient and safer new generation of brominated flame-retardants are possible by eliminating the use of antimony trioxide [20]. 

Several methods have been developed for the patterning of biomolecules or locally modulating their activity on surfaces [10]. Local generation of bromine or chlorine can be used to inactivate immobilized enzymes. The system studied... 

Greb, M Hartung, J., Kohler, F, Spehar, K., Kluge, R., Csuk, R. (2004) The (Schiff base)vanadium( V) Complex Catalyzed Oxidation of Bromide - A New Method for the In Situ Generation of Bromine and Its Application in the Synthesis of Functionalized Cyclic Ethers. Eur. J. Org. Chem. 2004 3799-3812. 

Another post-column reaction system, based on the on-line electrochemical generation of bromine from bromide, was claimed to be as sensitive as the dual... 

In the procedure involving in situ generation of bromine, what is the solid that appears when the concentrated hydrogen bromide is added ... 

The constant-current generation of bromine is carried out in a medium of dichloroacetic acid, hexafluoroisopropanol, water, potassium bromide and mercury(II)chloride. To this medium an amount of the polymer, previously dissolved in hexafluoroisopropanol and diluted with anhydrous dichloroacetic acid, is added and bromine generated. The end of the reaction is detected biamperometrically. The suitability of this method was tested against methyl vinyl terephthalate. 

Begin titration of the specimen. As the titration proceeds, keep the generation current at the selected value. The generation of bromine will continue as long as it is consumed by the sample. At the end point an incremental increase in bromine concentration causes the titrator and timer to stop automatically. Forty seconds after the titrator has shut off, continue the titration. If the titrator cuts off, immediately, the end point has been reached and the titration may be considered complete. Otherwise, it may be necessary to continue the titration in steps, waiting about 40 s between steps, until the titration time increment is 4 s or less. Note the total titration time and generation current. 

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