We also report on the exclusive aromatic ring bromination of several methyl anisoles with NBS in CH3CN, which strongly contrasts with the predominant benzylic brominationg observed for the same substrates in CCl4. (thevespiary.org)
Regioselective Bromination2
Regioselective Bromination and Functionalization of Dibenzo[hi,st]ovalene as Highly Luminescent Nanographene with Zigzag Edges. (mpg.de)
Substrate Controlled Regioselective Bromination of Acylated Pyrroles Using Tetrabutylammonium Tribromide (TBABr 3 ). (bvsalud.org)
Reaction8
The Wohl-Ziegler reaction is a chemical reaction that involves the allylic or benzylic bromination of hydrocarbons using an N-bromosuccinimide and a radical initiator. (wikipedia.org)
The mechanism by which the Wohl-Ziegler reaction proceeds was proposed by Paul Goldfinger in 1953, and his reaction mechanism is one of two proposed pathways through which aliphatic, allylic, and benzylic bromination with N-bromosuccinimide (NBS) occurs. (wikipedia.org)
describing the bromination mechanism of NBS stating that "NBS works because it liberates Br2 when reacting with HBr, which itself is usually liberated when a substrate is brominated by Br2, thus keeping the concentration of free elemental bromine low in the reaction mixture. (thevespiary.org)
In this paper the bromination reaction between antimony oxide (Sb 2 O 3 ) and hydrobromic acid, originating from the thermal decomposition of tetrabromobisphenol A (TBBPA), under inert and oxidative atmospheres was investigated using differential scanning calorimetry (DSC) analysis and a laboratory-scale furnace. (elsevierpure.com)
Additional experiments conducted at selected temperatures under an oxidative atmosphere (He + 5%O 2 ) indicated that the presence of oxygen has only a small influence on the bromination reaction, however, these conditions may enhance the decomposition of TBBPA at 340 °C, which may result in enhanced evaporation of the formed SbBr 3 at 340 °C. (elsevierpure.com)
We carried out a computational investigation on the mechanism of the bromination reaction of N-phenylacetamide inside CNTs, in water, and in an aprotic solvent (ethylbenzene). (unibo.it)
Factors affecting the reversibility of the electrophilic step in olefin bromination. (unipi.it)
Aqueous1
Acrylamide was first converted to its 2,3-dibromopropionamide derivative in aqueous solution, plasma or tissue homogenates by ionic bromination. (cdc.gov)
Ionic1
The reason why acetonitrile was used is because it is beleived that it causes a substantial increase in the rate of the ionic process hoping that ring bromination would be greatly favored. (thevespiary.org)
Ortho1
10.1021/jo300713h ) selective ortho bromination of the carbamate 18 , to give 19 . (organic-chemistry.org)
Laboratory1
Hydrogen bromide gas can be made in the laboratory by the bromination of tetralin (1,2,3,4-tetrahydronapthalene). (webelements.com)
Liquid-phase1
Ethylene dibromide is produced by liquid-phase bromination of ethylene at 35-85ºC. (cdc.gov)
Method1
Porphyrins and metalloporphyrins are unique class of molecules for Nonlinear Optical applications because of their unique structure of altering the central metal atom, large extended π-system, high thermal stability, tunable shape, symmetry and synthetic versatility Here, we report χ(3) Measurements of a simple phenyl porphyrins and its highvalent tin(IV) porphyrins with Bromination characterized by UV-Visible spectroscopic method. (amrita.edu)
Conditions1
10.1016/j.tetlet.2012.02.101 ) conditions for the bromination of an electron deficient arene such as 1 . (organic-chemistry.org)
Rate1
2. The addition of a large excess of potassium bromide previous to titration with bromate solution decreases the rate of bromination of Crocein salt. (bl.uk)
Place2
The results indicate that the bromination follows the decomposition of the TBBPA and takes place below 340 °C in the furnace and around 280 °C during DSC analysis. (elsevierpure.com)
Sepia toning usually takes place on paper prints (such as via bromination) either as a accidental by-product or intentional archival technique. (shorpy.com)
Figure1
In this study, we employed the Degenerate Four Wave Mixing technique using forward Boxcar geometry with an Nd:YAG nano second pulsed laser as source and it was found that the tin(IV) porphyrin with Bromination exhibits good χ(3) value and figure of merit. (amrita.edu)
Alternative2
Due to the high toxicity and ozone-depleting nature of carbon tetrachloride, trifluorotoluene has been proposed as an alternative solvent suitable for the Wohl-Ziegler bromination. (wikipedia.org)
My only other alternative option is the BCDMH pool bromination agent. (sciencemadness.org)
The high-temperature bromination of 1a,2,7,7a-tetrahydro-1H-cyclopropa[b] naphthalene and its carboethoxy derivative was studied. (metu.edu.tr)
Benzylic4
The Wohl-Ziegler reaction is a chemical reaction that involves the allylic or benzylic bromination of hydrocarbons using an N-bromosuccinimide and a radical initiator. (wikipedia.org)
The mechanism by which the Wohl-Ziegler reaction proceeds was proposed by Paul Goldfinger in 1953, and his reaction mechanism is one of two proposed pathways through which aliphatic, allylic, and benzylic bromination with N-bromosuccinimide (NBS) occurs. (wikipedia.org)
The detailed development of photochemical benzylic brominations using a NaBrO 3 /HBr bromine generator in continuous flow mode is reported. (rsc.org)
In the case of the carboethoxy derivative,bromination took place both regio- and stereospecifically at the benzylic positions,the cyclopropane ring did not undergo bond cleavage. (metu.edu.tr)
Alkenes2
Take the bromination of alkenes , for instance. (esterlium.net)
How is the bromination of alkenes best represented? (imperial.ac.uk)
We investigated correlation between the degree of P3HT bromination (2, 11, 22, 37, 66, 84, 100%) and the photovoltaic properties of Br-P3HT:phenyl-C 61 -butyric acid methyl ester (PCBM) BHJ solar cells. (rsc.org)
The extent of transformation was inversely proportional to the degree of bromination. (nih.gov)
9. Hydroxylated polybrominated diphenyl ethers exhibit different activities on thyroid hormone receptors depending on their degree of bromination. (nih.gov)
Procedure2
Analogously, the procedure can be applied to decarboxylative brominations by simply switching iodine with tetrabutylammonium tribromide, nBu4NBr3. (manchester.ac.uk)
The bromination of 2,5-DMA is, of course, the preferred procedure for the synthesis of 4-Br-2,5- DMA, or DOB, q.v. None of these positional isomers has evear been put into man, but 3-Br-2,6-DMA and the iodo-counterpart have been explored as potential radio-fluorine carriers into the brain. (drugwiki.net)
High2
Due to the high toxicity and ozone-depleting nature of carbon tetrachloride, trifluorotoluene has been proposed as an alternative solvent suitable for the Wohl-Ziegler bromination. (wikipedia.org)
Due to its simplicity and high yield, the bromination of styrene was selected for this preparation. (sciencemadness.org)
System1
In addition, the catalytic system developed has demonstrated potential for the bromination of organic compounds. (thieme.de)