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Journal articles on the topic 'Bromination'

Author: Grafiati
Published: 4 June 2021
Last updated: 29 January 2023

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1

Choothong, Nuorn, and Seiichi Kawahara. "BROMINATION OF NATURAL RUBBER WITH N-BROMOSUCCINIMIDE." Rubber Chemistry and Technology 95, no. 1 (October 1, 2021): 37–45. http://dx.doi.org/10.5254/rct.21.78980.

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ABSTRACT The mechanism of bromination of natural rubber (NR) was studied by solution-state 1H-NMR spectroscopy. The bromination of NR was carried out at 20–50 °C with N-bromosuccinimide as the brominating agent, and the kinetic study of bromination was conducted under nitrogen atmosphere at 30–50 °C for various reaction times. The influence of bromine atom substituent on the bromination rate constant (k) also was investigated. Bromine atom content was found to be dependent upon the reaction time, indicating first-order kinetics. The activation energy of bromination of NR, calculated from the reaction rate constants, was 19.3, 5.5, and 5.8 kJ mol−1 for bromine atom linked to carbon atom with methylene proton and methylene protons, respectively.
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2

Van Kerrebroeck, Reinout, Pieter Naert, Thomas S. A. Heugebaert, Matthias D’hooghe, and Christian V. Stevens. "Electrophilic Bromination in Flow: A Safe and Sustainable Alternative to the Use of Molecular Bromine in Batch." Molecules 24, no. 11 (June 4, 2019): 2116. http://dx.doi.org/10.3390/molecules24112116.

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Bromination reactions are crucial in today’s chemical industry since the versatility of the formed organobromides makes them suitable building blocks for numerous syntheses. However, the use of the toxic and highly reactive molecular bromine (Br2) makes these brominations very challenging and hazardous. We describe here a safe and straightforward protocol for bromination in continuous flow. The hazardous Br2 or KOBr is generated in situ by reacting an oxidant (NaOCl) with HBr or KBr, respectively, which is directly coupled to the bromination reaction and a quench of residual bromine. This protocol was demonstrated by polybrominating both alkenes and aromatic substrates in a wide variety of solvents, with yields ranging from 78% to 99%. The protocol can easily be adapted for the bromination of other substrates in an academic and industrial environment.
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3

Yan, Jingling, Liang Zhu, Brian L. Chaloux, and Michael A. Hickner. "Anion exchange membranes by bromination of tetramethylbiphenol-based poly(sulfone)s." Polymer Chemistry 8, no. 16 (2017): 2442–49. http://dx.doi.org/10.1039/c7py00026j.

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Anion exchange membranes were developed by brominating poly(sulfone)s based on tetramethylbiphenol, and their bromination reaction and properties were compared with those based on tetramethylbisphenol A.
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4

Liu, Ming Xing, Li Xiu Hu, Xian Wen Wang, and Hong Da Zhu. "A Simple, Efficient and Selective α-Monobromination for Arylacenones under Solvent-Free Condition." Advanced Materials Research 396-398 (November 2011): 1079–82. http://dx.doi.org/10.4028/www.scientific.net/amr.396-398.1079.

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The α-bromination reaction of arylacenones with 1,2-dipyridiniumditribromide-ethane (DPTBE) as brominating agent under solvent-free condition, selectively gave the corresponding α-bromoarylacenones derivatives with a simple procedure and excellent yields.
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5

Sen, Partha Pratim, Vishal Jyoti Roy, and Sudipta Raha Roy. "Metal-free regioselective bromination of imidazo-heteroarenes: the dual role of an organic bromide salt in electrocatalysis." Green Chemistry 23, no. 15 (2021): 5687–95. http://dx.doi.org/10.1039/d1gc01069g.

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This paper presents an organo-electrocatalysis method which demonstrates the dual role of an organic bromide salt as a brominating agent and as an electrolyte for the regioselective bromination of imidazo heteroaromatic motifs.
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6

Satkar, Yuvraj, Velayudham Ramadoss, Pradip D. Nahide, Ernesto García-Medina, Kevin A. Juárez-Ornelas, Angel J. Alonso-Castro, Ruben Chávez-Rivera, J. Oscar C. Jiménez-Halla, and César R. Solorio-Alvarado. "Practical, mild and efficient electrophilic bromination of phenols by a new I(iii)-based reagent: the PIDA–AlBr3system." RSC Advances 8, no. 32 (2018): 17806–12. http://dx.doi.org/10.1039/c8ra02982b.

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A practical electrophilic bromination procedure for the phenolic core was developed under efficient and very mild reaction conditions. The new I(iii)-based brominating reagentPhIOAcBroperationally easy to prepare by mixing PIDA and AlBr3was used.
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7

Argade, Narshinha, and Kailas Pandhade. "First Total Synthesis of (±)-Rhodoconferimide." Synthesis 50, no. 03 (November 6, 2017): 658–62. http://dx.doi.org/10.1055/s-0036-1590944.

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Starting from vanillin and dimethyl maleate, a concise and efficient racemic total synthesis of the potent antioxidant marine natural product (±)-rhodoconferimide has been carried out via the Wittig reaction, catalytic hydrogenation, selective brominations, and imide formation. An appropriate regioselective double bromination of the aromatic ring was a key step in the synthesis.
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8

Wang, Ligeng, Chun Feng, Yan Zhang, and Jun Hu. "Regioselective Monobromination of Phenols with KBr and ZnAl–BrO3−–Layered Double Hydroxides." Molecules 25, no. 4 (February 18, 2020): 914. http://dx.doi.org/10.3390/molecules25040914.

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The regioselective mono-bromination of phenols has been successfully developed with KBr and ZnAl–BrO3−–layered double hydroxides (abbreviated as ZnAl–BrO3−–LDHs) as brominating reagents. The para site is much favorable and the ortho site takes the priority if para site is occupied. This reaction featured with excellent regioselectivity, cheap brominating reagents, mild reaction condition, high atom economy, broad substrate scope, and provided an efficient method to synthesize bromophenols.
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9

Sneh, Kumar, Takeru Torigoe, and Yoichiro Kuninobu. "Manganese/bipyridine-catalyzed non-directed C(sp3)–H bromination using NBS and TMSN3." Beilstein Journal of Organic Chemistry 17 (April 22, 2021): 885–90. http://dx.doi.org/10.3762/bjoc.17.74.

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A Mn(II)/bipyridine-catalyzed bromination reaction of unactivated aliphatic C(sp3)−H bonds has been developed using N-bromosuccinimide (NBS) as the brominating reagent. The reaction proceeded in moderate-to-good yield, even on a gram scale. The introduced bromine atom can be converted into fluorine and allyl groups.
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10

Sobolev, Vasily, Vyacheslav Radchenko, Roman Ostvald, Victor D. Filimonov, and Ivan Zherin. "p-Nitrotoluene Bromination Using Barium Fluorobromate Ba(BrF4)2." Advanced Materials Research 1040 (September 2014): 337–41. http://dx.doi.org/10.4028/www.scientific.net/amr.1040.337.

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It was shown that Ba (BrF4)2 acts like a highly-active brominating agent in case of interaction with p-nitrotoluene, the pure 3-bromo-nitrotoluene is formed. It was shown, that typical electrophilic bromination of aromatic compound with electron-donating and electron-accepting substituents occurs without any catalysts and hard conditions.
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11

Chaudhuri, Subrata Kumar, Sanchita Roy, and Sanjay Bhar. "Dioxane dibromide mediated bromination of substituted coumarins under solvent-free conditions." Beilstein Journal of Organic Chemistry 8 (February 29, 2012): 323–29. http://dx.doi.org/10.3762/bjoc.8.35.

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An efficient solvent-free protocol for regioselective bromination of substituted coumarins has been developed by using dioxane dibromide as the solid brominating agent. The efficacy of the solvent-free protocol has been established. The effects of the electronic nature and location of the substituents on the outcome of the reaction have been rationalized with a proposed mechanism.
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12

Tian, Hongyu, Baoguo Sun, Rui Ding, Jiaqi Li, Wenyi Jiao, Mengru Han, and Yongguo Liu. "A Highly Efficient Method for the Bromination of Alkenes, Alkynes and Ketones Using Dimethyl Sulfoxide and Oxalyl Bromide." Synthesis 50, no. 21 (August 8, 2018): 4325–35. http://dx.doi.org/10.1055/s-0037-1609560.

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The pairing of DMSO and oxalyl bromide is reported as a highly efficient brominating reagent for various alkenes, alkynes and ketones. This bromination approach demonstrates remarkable advantages, such as mild conditions, low cost, short reaction times, provides excellent yields in most cases and represents a very attractive alternative for the preparation of dibromides and α-bromoketones.
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13

Grishchenko, L. M., A. N. Zaderko, G. G. Tsapyuk, I. P. IMatushko, A. V. Yatsymyrskyi, and O. V. Mischanchuk. "Dehydration of isopropyl alcohol with activated carbon functionalized with Br- and S-containing reagents." Voprosy Khimii i Khimicheskoi Tekhnologii, no. 3 (May 2021): 90–99. http://dx.doi.org/10.32434/0321-4095-2021-136-3-90-99.

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Bromination of activated carbon GSGD was performed and active bromine-containing precursors were obtained, in which bromine is capable of being replaced by sulfur-containing functional groups. Bromination with liquid bromine and a solution of bromine in potassium bromide at room temperature leads to the introduction of 0.44–0.45 mmol g–1 of bromine into the surface layer of activated carbon. The treatment of brominated samples with sulfur-containing reagents with subsequent oxidation allows obtaining carbon samples that are catalytically active in the dehydration reaction of isopropyl alcohol in a gas phase. The temperature of complete conversion of isopropyl alcohol to propylene is a measure of catalytic activity. The concentration of sulfogroups in the prepared samples is up to 0.3 mol g–1. Thermogravimetry and thermoprogrammed desorption with mass spectrometric registration of products were used to study the thermal stability of modified activated carbon samples. The influence of the nature of brominating reagents, hydrolysis conditions and oxidation conditions on the structure, surface concentration of grafted S-containing groups and catalytic properties of the obtained materials was studied. Pre-bromination leads to an increase in the catalytic activity of activated carbon modified with sulfur-containing groups and the temperature of complete conversion of isopropyl alcohol to propylene decreases up to 400C depending on the concentration of sulfogroups.
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14

Daştan, Arif, Metin Balci, Tuncer Hökelek, Dinçer Ülkü, and Orhan Büyükgüngör. "High temperature bromination VI: Bromination of benzobarrelene." Tetrahedron 50, no. 35 (January 1994): 10555–78. http://dx.doi.org/10.1016/s0040-4020(01)89596-x.

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15

Daştan, Arif, Yavuz TaŞkesenligil, Ferhan Tümer, and Metin Balci. "High temperature bromination VIII: Bromination of homobenzonorbornadiene." Tetrahedron 52, no. 44 (October 1996): 14005–20. http://dx.doi.org/10.1016/0040-4020(96)00843-5.

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16

Dunn, A. D., A. Currie, and L. E. Hayes. "Bromination of pyridines. II. Bromination of Aminopicolines." Journal f�r Praktische Chemie 331, no. 3 (1989): 369–74. http://dx.doi.org/10.1002/prac.19893310302.

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17

Roush, William R., David J. Madar, and D. Scott Coffey. "Synthesis of highly functionalized naphthoate precursors to damavaricin D — Observation of kinetically stable benzocyclohexadienones in the bromination reactions of highly functionalized β-naphthol derivatives." Canadian Journal of Chemistry 79, no. 11 (November 1, 2001): 1711–26. http://dx.doi.org/10.1139/v01-135.

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Selective syntheses of the highly substituted bromonaphthoates 4a, 4b, 19, and 22 are reported. These compounds were targeted as precursors to the naphthoquinone nucleus of damavaricin D; compound 22 ultimately was used in the successful total synthesis. The synthesis of 22 features the Diels–Alder reaction of the oxygenated diene 5 and 2,6-dibromo-3-methylbenzoquinone 6 to establish the core naphthalenic unit. The quinone was protected throughout this synthesis as a 1,4-bis-methoxymethyl-1,4-dihydroquinone (see 36). The C-2-carboalkoxy group of 22 was added by carboxylation of the aryllithium intermediate generated from 36, and protected as a β-trimethylsilylethyl ester. Finally, the C-8-Br substituent was introduced by NBS bromination of 38. This reaction proceeds by way of bromobenzocyclohexadienone 39. Related bromobenzo-cyclohexadienones 13 and 29 were observed in the NBS brominations of the highly functionalized β-naphthyl MOM ethers 11 and 28. The bromobenzocyclohexadienones 29 and 39 undergo facile substitution reactions with chloride ion and reduction with bromide ion at rates competitive with base-promoted aromatization. The surprising kinetic stability of these intermediates is attributed to a combination of steric and stereoelectronic factors.Key words: damavaricin D, naphthoate precursors, kinetically stable benzocyclohexadienones, aromatic bromination.
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18

Kim, Jungpil, Yasuhiro Yamada, and Satoshi Sato. "Bromination Reactivity of Oxygen-Terminated Edges of Graphene." Journal of Nanoscience and Nanotechnology 21, no. 5 (May 1, 2021): 3004–9. http://dx.doi.org/10.1166/jnn.2021.19128.

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The bromination reactivity of various types of polycyclic aromatic hydrocarbons (PAHs) with oxygen atoms and graphene with oxygen atoms was estimated by density functional theory calculation and experimentally clarified by analyzing bromination of PAHs using gas chromatography–mass spectrometry. In the experimental and theoretical bromination reactivity of PAHs, the presence of hydroxyl group increased the reactivity of PAHs because of electron-donating nature of the hydroxyl group but the other oxygen-containing functional groups such as lactone, ether, and ketone decreased the reactivity due to the electron-withdrawing nature of those groups. These effects of functional groups on the reactivity were also confirmed in graphene. The tendency of theoretical bromination reactivity of graphene was graphene with hydroxyl group > graphene with no group > graphene with lactone group > graphene with ether group > graphene with ketone group. Our study on the estimation of bromination reactivity of graphene edges provides the groundwork for the bromination of graphene edges.
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19

Menzek, Abdullah, Nurullah Saraçoğlu, Arif Daştan, Metin Balci, and Riza Abbasoglu. "Bromination of benzhomobarrelene derivatives: 10. High temperature bromination." Tetrahedron 53, no. 42 (October 1997): 14451–62. http://dx.doi.org/10.1016/s0040-4020(97)00937-x.

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20

Bahrami, Mozhgan, Xingwen Zhang, Morteza Ehsani, Yousef Jahani, and Richard M. Laine. "[PhSiO1.5]8,10,12as nanoreactors for non-enzymatic introduction of ortho, meta or para-hydroxyl groups to aromatic molecules." Dalton Transactions 46, no. 27 (2017): 8797–808. http://dx.doi.org/10.1039/c7dt00373k.

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Traditional electrophilic bromination follows long established “rules”: electron-withdrawing substituents cause bromination selective formetapositions, whereas electron-donating substituents favororthoandparabromination.
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21

Daştan, Arif, M. Nawaz Tahir, Dinçer Ülkü, and Metin Balci. "Bromination of naphthalene and derivatives: High temperature bromination XI." Tetrahedron 55, no. 44 (October 1999): 12853–64. http://dx.doi.org/10.1016/s0040-4020(99)00758-9.

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22

Cataldo, Franco, Ornella Ursini, and Pietro Ragni. "Ultrasound-assisted Bromination. Part 1: Bromination of C60and C70." Fullerenes, Nanotubes and Carbon Nanostructures 21, no. 4 (October 15, 2012): 346–56. http://dx.doi.org/10.1080/1536383x.2011.613544.

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23

Mazov, Ilya, Dmitry Krasnikov, Andrey Stadnichenko, Vladimir Kuznetsov, Anatoly Romanenko, Olga Anikeeva, and Evgeniy Tkachev. "Direct Vapor-Phase Bromination of Multiwall Carbon Nanotubes." Journal of Nanotechnology 2012 (2012): 1–5. http://dx.doi.org/10.1155/2012/954084.

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We present the simple procedure of the vapor-phase bromination of multiwall carbon nanotubes (MWNTs) at moderate temperatures. MWNTs with average diameter9±3 nm were treated with Br2vapors at 250°C to produce Br-functionalized product. Transmission electron microscopy analysis was used to prove low damage of MWNT walls during bromination. X-ray photoelectron spectroscopy (XPS) and differential thermal analysis (DTA) were used to investigate chemical composition of the surface of initial and brominated nanotubes. The experimental results show that the structure of MWNTs is not affected by the bromination process and the total amount of Br-containing surface functions reaches 2.5 wt. %. Electrophysical properties of initial and brominated MWNTs were investigated showing decrease of conductivity for functionalized sample. Possible mechanism of the vapor-phase bromination via surface defects and oxygen-containing functional groups was proposed according to data obtained. Additional experiments with bromination of annealed low-defected MWNTs were performed giving Br content a low as 0.75 wt. % proving this hypothesis.
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24

Tan, Shu Er, and Mohd Sani Sarjadi. "Alternative pathway to brominate 2,13-benzothiadiazole: Preparation of 4,7-dibromobenzo[c]-1,2,5-thiadiazole via N-bromosuccinimide." Malaysian Journal of Fundamental and Applied Sciences 13, no. 4 (December 26, 2017): 760–63. http://dx.doi.org/10.11113/mjfas.v0n0.549.

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This present work reports an alternative pathway to brominate the 2,1,3-benzothiadiazole (BT). The conventional method to brominate a phenyl/benzene ring is to use the bromine solution (Br2) together with hydrobromic acid (HBr). This is because the phenyl/benzene rings exhibit high stability due to the delocalized -conjugation, which the substitution of bromines into the rings can only be done through a strong bromination source, e.g. the Br2/HBr. Besides that, there is another bromine source, known as N-bromosuccinimide (NBS), which is normally used for bromination of thiophene rings but not the phenyl/benzene ring. The bromination ability of NBS is relatively mild than the Br2/HBr. Herein, this research shows that bromination of benzene/phenyl ring through NBS is possible under a drastic condition that involved the usage of 96% concentrated sulphuric acid and chloroform at room temperature. This alternative pathway can be used when there is limit access to the Br2 and bromination through NBS is relatively less dangerous than the Br2/HBr.
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25

Mustafayeva, Fatima A., and Najaf T. Kakhramanov. "BROMINATION OF AROMATIC AMINES." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 62, no. 4 (April 6, 2019): 47–59. http://dx.doi.org/10.6060/ivkkt.20196204.5673.

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It is known that the antipyrenes, biological active substances (antitumor, antibacterial, antifungal, antiviral), pharmacological preparations on the basis of bromine-containing aromatic compounds are widely used in the industry. Considering this and increased demand for these substances the purpose of this work was to summarize and systematize the accumulated knowledge in this area. The article presents methods and reagent systems used in the bromination of aromatic amines. There have been described the bromination of aromatic amines with hydrogen bromide, sodium bromide, potassium bromide, ammonium bromide, copper (II) bromide, N-bromosuccinimide, N-bromosaccharin, polymer-supported halogenation agents, and difference of these methods from the point of view of the used oxidizer, the medium and the solvent, the catalyst, the regioselectivity, the quantity of bromine atoms in the obtained product. The influence of solvents, catalysts, the nature (electron-donor or electron-acceptor) and position (ortho-, meta-, para-) of the substituents in the aromatic ring, reaction conditions, molar ratio of the reagents, reaction temperature and carrying out time of bromination reaction of aromatic amines has been shown. The bromination reactions courses of aromatic amines in different solvents, in solvent free conditions, in solid states has been described. The bromination of aromatic amines under thermal, microwave, ultraviolet radiation conditions has been studied. In the paper the regioselective monobromination and also obtaining of di-, tri- bromo derivatives of aromatic amines has been shown. Taking into account today's priority to environmentally safe methods of bromination of aromatic amines they have been also mentioned. Given the above, in our opinion, the information presented in this article will help to optimize the production of bromo derivatives of aromatic amines used in industry, technics and technology.
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26

Çakmak, Osman, Ismail Kahveci, Íbrahim Demirtaş, Tuncer Hökelek, and Keith Smith. "Bromination of Tetralin. Short and Efficient Synthesis of 1,4-Dibromonaphthalene." Collection of Czechoslovak Chemical Communications 65, no. 11 (2000): 1791–804. http://dx.doi.org/10.1135/cccc20001791.

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High-temperature bromination of tetralin (1,2,3,4-tetrahydronaphthalene) with bromine resulted in benzylic bromination to give 1,4-dibromo-1,2,3,4-tetrahydronaphthalene (4) as a major product and several secondary products. Photolytic bromination of tetralin and subsequent double dehydrobromination of 1,1,4,4-tetrabromo-1,2,3,4-tetrahydronaphthalene (10) gave 1,4-dibromonaphthalene (11) as the sole product in a high yield. 1,4-Dibromonaphthalene is efficiently converted to the corresponding methoxy (12 and 13) and cyano (14 and 15) derivatives of naphthalene.
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27

Harms, G., and M. J. Hardonk. "Specific demonstration of ribonucleic acid by chemical bromination and immunohistochemistry." Journal of Histochemistry & Cytochemistry 37, no. 4 (April 1989): 479–85. http://dx.doi.org/10.1177/37.4.2466888.

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In this report we describe a specific staining procedure for detection of ribonucleic acid (RNA), based on bromination of uracil and subsequent immunohistochemical visualization of 5-bromouracil in RNA. This method is applicable for both cryostat and glycol methacrylate (GMA)-embedded sections. Cryostat sections must be fixed in formaldehyde, whereas tissue pieces to be embedded in GMA are fixed in cold acetone. Before bromination, sections must be treated with trypsin. Bromination was performed in a solution of bromine in potassium bromide. After bromination, excess bromine was removed with sodium bisulfite. The monoclonal antibody MoBu-1 specifically bound to brominated RNA. Ribonuclease digestion, in contrast to deoxyribonuclease digestion, abolished staining. This method makes possible precise localization of RNA, especially well demonstrated in plastic-embedded sections.
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28

Mohan, Reddy Bodireddy, G. Trivikram Reddy, and N. C. Gangi Reddy. "Substrate Directed Regioselective Monobromination of Aralkyl Ketones Using N-Bromosuccinimide Catalysed by Active Aluminium Oxide: α-Bromination versus Ring Bromination." ISRN Organic Chemistry 2014 (March 4, 2014): 1–11. http://dx.doi.org/10.1155/2014/751298.

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Bromination of aralkyl ketones using N-bromosuccinimide in presence of active Al2O3 provided either α-monobrominated products in methanol at reflux or mononuclear brominated products in acetonitrile at reflux temperature with excellent isolated yields depending on the nature of substrate employed. The α-bromination was an exclusive process when aralkyl ketones containing moderate activating/deactivating groups were subjected to bromination under acidic Al2O3 conditions in methanol at reflux while nuclear functionalization was predominant when aralkyl ketones containing high activating groups were utilized for bromination in presence of neutral Al2O3 conditions in acetonitrile at reflux temperature. In addition, easy isolation of products, use of inexpensive catalyst, short reaction time (10–20 min), and safe operational practice are the major benefits in the present protocol.
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29

Výprachtický, Drahomír, Dana Kaňková, Veronika Pokorná, Ivan Kmínek, Vagif Dzhabarov, and Věra Cimrová. "Novel and Simple Synthesis of Brominated 1,10-Phenanthrolines." Australian Journal of Chemistry 67, no. 6 (2014): 915. http://dx.doi.org/10.1071/ch13711.

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A novel, simple, and reasonably efficient synthesis of 3,8-dibromo-1,10-phenanthroline, 3,6-dibromo-1,10-phenanthroline, 3,5,8-tribromo-1,10-phenanthroline, and 3,5,6,8-tetrabromo-1,10-phenanthroline is presented herein. The crucial role of a new catalyst (sulfur dichloride – SCl2) for the bromination of 1,10-phenanthroline is reported. The bromination of 1,10-phenanthroline monohydrate in the presence of SCl2 and pyridine yielded the brominated compounds, previously only possible through the complicated multi-step and tedious Skraup synthesis method. The application of the bromination catalyst SCl2 as a medium-strength Lewis acid is demonstrated for the first time, and the results are compared with the behaviours of known weak (sulfur chloride – S2Cl2) and strong (thionyl chloride – SOCl2) bromination catalysts. A reaction mechanism was proposed.
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30

Chinea, Kimberly, Willian Vera, and Ajoy K. Banerjee. "Synthesis of 2-Acetyl-1,4-Dimethoxynaphthalene, A Potential Intermediate for Disubstituted Naphtho[2,3,c]pyran-5,10-dione." Natural Product Communications 9, no. 2 (February 2014): 1934578X1400900. http://dx.doi.org/10.1177/1934578x1400900221.

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2-Acetyl-1-hydroxynaphthalene was converted into the title compound in three steps (bromination, substitution and methylation). 1-Methoxynaphthalene on bromination, substitution and acetylation, respectively, also yielded the target compound.
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31

Hasse, Katrin, Anthony C. Willis, and Martin G. Banwell. "A Total Synthesis of the Marine Alkaloid Ningalin B from (S)-Proline." Australian Journal of Chemistry 62, no. 7 (2009): 683. http://dx.doi.org/10.1071/ch09158.

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The title alkaloid 1 has been synthesized from (S)-proline (2) using a sequence of reactions involving oxidative bromination (of 2), N-alkylation, Suzuki–Miyaura cross-coupling, and bromination steps.
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32

Ivachtchenko, Alexandre V., Pavel M. Yamanushkin, Oleg D. Mitkin, and Oleg I. Kiselev. "Bromination of indomethacin." Mendeleev Communications 20, no. 2 (March 2010): 111–12. http://dx.doi.org/10.1016/j.mencom.2010.03.016.

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33

Schatz, Paul F. "Bromination of Acetanilide." Journal of Chemical Education 73, no. 3 (March 1996): 267. http://dx.doi.org/10.1021/ed073p267.

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34

Tokmatov, G. P., T. E. Monakhova, O. N. Tolkachev, and I. I. Grandberg. "Bromination of ergocryptines." Pharmaceutical Chemistry Journal 25, no. 6 (June 1991): 416–19. http://dx.doi.org/10.1007/bf00772146.

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35

Currie, Fredrik, Krister Holmberg, and Gunnar Westman. "Bromination in microemulsion." Colloids and Surfaces A: Physicochemical and Engineering Aspects 215, no. 1-3 (March 2003): 51–54. http://dx.doi.org/10.1016/s0927-7757(02)00420-x.

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36

Erben, Christoph, Hans Grade, and Gregory D. Goddard. "Bromination of octaphenylsilsesquioxane." Silicon Chemistry 3, no. 1-2 (March 15, 2006): 43–49. http://dx.doi.org/10.1007/s11201-005-9000-5.

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37

Beletskaya, Irina, Alexander Sigeev, Alexander Peregudov, and Pavel Petrovskii. "Catalytic Sandmeyer Bromination." Synthesis 2007, no. 16 (August 2007): 2534–38. http://dx.doi.org/10.1055/s-2007-983784.

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38

Chandler, Graham S., and Wolfgang H. F. Sasse. "Bromination of Acridine." Australian Journal of Chemistry 71, no. 4 (2018): 285. http://dx.doi.org/10.1071/ch17619.

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The quantitative determination of the products of bromination of acridine in concentrated sulfuric acid and glacial acetic acid is described. In both cases, the only monobromo products were the 2- and 4-substituted compounds. With sulfuric acid, the 4-isomer predominates whereas in acetic acid, the 2-isomer is predominant. This work expands substantially on the tiny amount of previous work on halogenation of dibenzo-annelated pyridines.
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39

Muzychkina, R. A., and L. N. Pribytkova. "Bromination of emodin." Chemistry of Natural Compounds 26, no. 5 (September 1990): 524–27. http://dx.doi.org/10.1007/bf00601278.

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40

Dastan, Arif, M. Nawaz Tahir, Dinçer Ülkü, Philip B. Shevlin, and Metin Balci. "Bromination of Decalin and Its Derivatives. 9. High Temperature Bromination." Journal of Organic Chemistry 62, no. 12 (June 1997): 4018–22. http://dx.doi.org/10.1021/jo9700843.

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41

DASTAN, A., M. BALCI, T. HOEKELEK, D. UELKUE, and O. BUEYUEKGUENGOER. "ChemInform Abstract: High Temperature Bromination. Part 6. Bromination of Benzobarrelene." ChemInform 26, no. 8 (August 18, 2010): no. http://dx.doi.org/10.1002/chin.199508117.

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42

DASTAN, A., Y. TASKESENLIGIL, F. TUEMER, and M. BALCI. "ChemInform Abstract: High Temperature Bromination. Part 8. Bromination of Homobenzonorbornadiene." ChemInform 28, no. 9 (August 4, 2010): no. http://dx.doi.org/10.1002/chin.199709089.

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43

Nishina, Yuta, Bunsho Ohtani, and Kotaro Kikushima. "Bromination of hydrocarbons with CBr4, initiated by light-emitting diode irradiation." Beilstein Journal of Organic Chemistry 9 (August 14, 2013): 1663–67. http://dx.doi.org/10.3762/bjoc.9.190.

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The bromination of hydrocarbons with CBr4 as a bromine source, induced by light-emitting diode (LED) irradiation, has been developed. Monobromides were synthesized with high efficiency without the need for any additives, catalysts, heating, or inert conditions. Action and absorption spectra suggest that CBr4 absorbs light to give active species for the bromination. The generation of CHBr3 was confirmed by NMR spectroscopy and GC–MS spectrometry analysis, indicating that the present bromination involves the homolytic cleavage of a C–Br bond in CBr4 followed by radical abstraction of a hydrogen atom from a hydrocarbon.
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44

Wang, Jian, Shu-Bin Chen, Shu-Guang Wang, and Jing-Hua Li. "A Metal-Free and Ionic Liquid-Catalyzed Aerobic Oxidative Bromination in Water." Australian Journal of Chemistry 68, no. 3 (2015): 513. http://dx.doi.org/10.1071/ch14161.

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A metal-free aerobic oxidative bromination of aromatic compounds in water has been developed. Hydrobromic acid is used as a bromine source and 2-methylpyridinium nitrate ionic liquid is used as a recyclable catalyst. Water is used as the reaction mediate. This is the first report of aerobic oxidative bromination using only catalytic amount of metal-free catalyst. This system shows not only high bromine atom economy, but also high bromination selectivity. The possible mechanism and the role of the catalyst in this system have also been discussed.
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45

Bagheri, Mojtaba, Najmedin Azizi, and Mohammad R. Saidi. "An intriguing effect of lithium perchlorate dispersed on silica gel in the bromination of aromatic compounds by N-bromosuccinimide." Canadian Journal of Chemistry 83, no. 2 (February 1, 2005): 146–49. http://dx.doi.org/10.1139/v05-001.

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A convenient and efficient procedure for electrophilic aromatic bromination has been developed by mixing of N-bromosuccinimide and an aromatic compound at room temperature on the surface of silica gel mixed with solid anhydrous LiClO4. All of the substrates examined underwent clean electrophilic aromatic bromination in reaction times of a few minutes to afford the corresponding bromoarenes under neutral conditions in excellent yield. In the case of thiophenol, no substitution reaction occurred, and the corresponding disulfide was obtained in excellent yield.Key words: LP-SiO2, NBS, arenes, electrophilic bromination, regioselectivity.
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46

Seki, Masahiko, and Yusuke Takahashi. "A Practical Procedure for Regioselective Bromination of Anilines." Synthesis 53, no. 10 (March 16, 2021): 1828–32. http://dx.doi.org/10.1055/a-1441-3236.

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AbstractA highly practical procedure for the preparation of bromoanilines by using copper-catalyzed oxidative bromination has been developed. Treatment of free anilines with readily available NaBr and Na2S2O8 in the presence of a catalytic amount of CuSO4·5H2O enabled regioselective bromination.
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47

Zysman-Colman, Eli, Karla Arias, and Jay S. Siegel. "Synthesis of arylbromides from arenes and N-bromosuccinimide (NBS) in acetonitrile — A convenient method for aromatic bromination." Canadian Journal of Chemistry 87, no. 2 (February 2009): 440–47. http://dx.doi.org/10.1139/v08-176.

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Regioselective and chemoselective electrophilic bromination of a wide series of activated arenes using N-bromosuccinimide (NBS) in acetonitrile occurs readily. Environmentally friendly conditions, large substrate scope, and ease of synthesis enhance the utility of this method over other electrophilic bromination conditions.
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48

Uzundumlu, Eren, and Arif Daştan. "Bromination of Endo- and Exo-benzocyclobutenonorbornene Derivatives: Neighbour Group Effect on Bromination." Journal of Chemical Research 2005, no. 6 (June 2005): 348–51. http://dx.doi.org/10.3184/0308234054506901.

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The electrophilic addition of bromine to 13-anti-bromo-endo-benzocyclobutenonorbornene 7 at −50 ± 5 °C has led in high yield to the formation of the rearranged dibromides 9, 10 and 11. In addition to this, bromination of exo isomer 8 results in formation of rearranged 9 and non rearranged product 10. However, high-temperature bromination of endo 7 and exo isomer 8 at 77 °C gave only non-rearranged products. The possible role of a substituent in rearrangements is discussed in these systems.
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49

Daştan, Arif, M. Nawaz Tahir, Dinçer Ülkü, and Metin Balcı. "Corrigendum to “Bromination of Naphthalene and Derivatives: High Temperature Bromination XI”." Tetrahedron 56, no. 10 (March 2000): 1397. http://dx.doi.org/10.1016/s0040-4020(00)00064-8.

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50

Dunn, A. D., and S. Brown. "The bromination of pyridines. IV. The Bromination of Some Ethylated Pyridines." Journal f�r Praktische Chemie/Chemiker-Zeitung 334, no. 2 (1992): 176–78. http://dx.doi.org/10.1002/prac.19923340214.

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