Bromination

Distribution by Scientific Domains
Distribution within Chemistry

Kinds of Bromination

  • regioselective bromination

  • Terms modified by Bromination

  • bromination reaction

  • Selected Abstracts


    Platinum Complexes of Aromatic Selenolates

    EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 25 2010
    Amy L. Fuller
    Abstract Several synthetic methods are used to prepare naphthalene-based aromatic 1,2-diselenoles. A new one-pot synthesis starting from naphthalene is used to produce theknown compound naphtho[1,8- c,d][1,2]diselenole (Se2naph).Friedel,Crafts alkylation is used on Se2naph to substitute either one tert -butyl group to form 2- tert -butylnaphtho[1,8- c,d][1,2]diselenole (mt-Se2naph) or two tert -butyl groups to form 2,7-di- tert -butylnaphtho[1,8- c,d][1,2]diselenole (dt-Se2naph). Bromination of mt-Se2naph results in dibromination of the naphthalene ring, rather than reaction at selenium, to give 4,7-dibromo-2- tert -butylnaphtho[1,8- c,d][1,2]diselenole (mt-Se2naphBr2). Reduction of the Se,Se bond in Se2naph, mt-Se2naph, dibenzo[c,e][1,2]diselenine (dibenzSe2), or diphenyl diselenide (Se2Ph2) with LiBEt3 H, followed by in-situ addition of [PtCl2{P(OPh)3}2] yields the four-coordinate mono- and dinuclear platinum(II) bis(phosphite) complexes [Pt(Se2naph){P(OPh)3}2] (1), [Pt(mt-Se2naph){P(OPh)3}2] (2), [Pt2(dibenzSe2)2{P(OPh)3}2] (3), cis -[Pt(SePh)2{P(OPh)3}2] (4), and trans -[Pt2(SePh)4{P(OPh)3}2] (5). [source]


    Stable Ion and Electrophilic Substitution (Nitration and Bromination) Study of A-Ring Substituted Phenanthrenes: Novel Carbocations and Substituted Derivatives; NMR, X-ray Analysis, and Comparative DNA Binding

    EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 3 2007
    Cédric Brulé
    Abstract Persistent carbocations were generated from five A-ring mono- and di-substituted phenanthrenes [3-OMe; 4-OMe, 1,3-bis(OMe), 2,4-bis(OMe), and 1,3-bis(Me)]. In all cases protonation occurs in the A-ring, ortho/para relative to methoxy or methyl substituent(s). Complete NMR assignments of the resulting carbocations are reported and their charge delocalization modes are discussed. Mild nitration (with 20,50,% aqueous HNO3 at ,10 °C or at room temp.) and bromination (NBS/MeCN/room temp.) of these substrates resulted in the synthesis of several novel mononitro-/dinitro- as well as monobromo/dibromo derivatives, including those with nitro or bromo substituent in the bay-region. Correspondence between the site of attack in low-temperature protonation study and nitro substitution in ambient mild nitrations are examined. Complete NMR assignments for the new derivatives are reported as well as X-ray structures for 2,4-dimethoxy-1-nitro- and 1,3-dimethyl-4-nitrophenanthrenes. A comparative DNA binding study with MCF cells on three of the synthesized mononitro and one dinitro derivative showed that 1,3-dimethyl-9-nitro- (nitro at the meso position), 3-methoxy-4-nitro- (nitro in bay-region), and 1,3-dimethoxy-4,9-dinitrophenanthrenes (nitro in both meso and bay-regions) formed DNA adducts. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007) [source]


    Sol-Gel Entrapped Pyridinium Hydrobromide Perbromide as a Recyclable Bromination Agent: Its Application to a One-Pot Bromination and Dehydrobromination Process

    EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 6 2006
    Yevgenia Levin
    Abstract Silica sol-gel encaged pyridinium hydrobromide perbromide can be used for clean, odorless bromination of a variety of substrates, including alkenes, ketones, and arenes. The used heterogenized bromination reagent can be recharged with bromine and recycled. In the presence of sol-gel entrapped 1,5,7-triazabicyclo[4.4.0]dec-5-ene, dibromides are dehydrobrominated to give vinyl monobromides and/or alkynes. Encapsulation of the pyridinium derivative and the guanidine base within separate sol-gel matrices enables the use of both opposing reagents in one-pot reactions without their mutual destroying each other. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006) [source]


    One-pot PTC synthesis of polyfused pyrazoles

    HETEROATOM CHEMISTRY, Issue 3 2003
    Gamal A. El-Saraf
    Thienopyrazole 2, 3, 5, or 6 and thienopyrazolothiazepine 7, 9, and 11 derivatives were prepared via the reaction of the 3-aminopyrazoline-5-one 1 with CS2 and different molar ratio of a variety of halo compounds having an active methylene under PTC conditions. Also, treatment of 1 with CS2 and alcoholic KOH in 2:1:1 molar ratio afforded dipyrazolopyridine derivatives 12 and 14. On other hand, the pyrazolothiadiazineone derivative 13 was obtained by treating compound 1 with CS2 and alcoholic KOH in 1:2:2 molar ratio. Under PTC conditions, compound 1, CS2, and ethyl cyanoacetate or malononitrile to gave the pyrazolopyridine derivatives 16 and 17. Coupling of compound 1 with diazonium acetates afforded the hydrazone derivatives 18a,b, which were oxidized with bromine to give pyrazolotriazoles 19a,b or cyclized with aldehydes to give pyrazolotriazine derivatives 20a,e. Bromination of compound 1 afforded monobromopyrazole derivative 21, which could be condensed to a dipyrazolopyrazindione 23. Finally, the dibromopyrazole derivative 22 was cyclized with 2-mercaptoethanol or o-phenylenediamine to give the spiropyrazoles 24a,b. © 2003 Wiley Periodicals, Inc. Heteroatom Chem 14:211,217, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.10129 [source]


    Design and Application of 2,2-Dibromodimedone as Organic Brominating Reagent for Asymmetric Bromination of 1,3-Dicarbonyl Compounds and Ketones Catalysed by Chiral Amino Acids

    ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 10 2009
    Papori Goswami
    Abstract A green and ecofriendly enantioselective ,-bromination of carbonyl and 1,3-dicarbonyl compounds is reported involving the synthesis of a novel organic brominating source. The organic brominating reagent can be recovered after each cycle, rebrominated and reused. The reaction is catalysed by chiral amino acids and completed within a short reaction time with good enantioselectivity and exclusive formation of only ,-monobrominated carbonyl compounds. [source]


    Electrochemical Bromination of Peracetylated Glycals

    ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 1 2008
    Marija, olovi
    Abstract Bromination of glycals with tribromides formed in situ from bromine and different bromide salts in dichloromethane (DCM) or acetonitrile (AN) was found to give predominantly the products of anti addition of bromine from the C-6 side in high yields. The same selectivity, which was much higher compared to bromination with bromine alone, was achieved in bromination of these substrates by anodic generation of bromine from the same salts. [source]


    ChemInform Abstract: Regioselective Copper-Catalyzed Chlorination and Bromination of Arenes with O2 as the Oxidant.

    CHEMINFORM, Issue 11 2010
    Lujuan Yang
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]


    ChemInform Abstract: Synthesis of Arylbromides from Arenes and N-Bromosuccinimide (NBS) in Acetonitrile , A Convenient Method for Aromatic Bromination.

    CHEMINFORM, Issue 34 2009
    Eli Zysman-Colman
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]


    ChemInform Abstract: Isoquinolinium Bromochromate: An Efficient and Stable Reagent for Bromination of Hydroxylated Aromatic Compounds and Oxidation of Alcohols

    CHEMINFORM, Issue 33 2009
    Sandeep V. Khansole
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]


    ChemInform Abstract: An Efficient, Rapid, and Regioselective Bromination of Anilines and Phenols with 1-Butyl-3-methylpyridinium Tribromide as a New Reagent/Solvent under Mild Conditions.

    CHEMINFORM, Issue 23 2009
    Sanjay P. Borikar
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]


    ChemInform Abstract: A New Method of Bromination of Aromatic Rings by an iso-Amyl Nitrite/HBr System.

    CHEMINFORM, Issue 38 2008
    Laurent Gavara
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]


    ChemInform Abstract: Bromination of 5-Methoxyindane: Synthesis of New Benzoindenone Derivatives and Ready Access to 7H-Benzo[c]fluoren-7-one Skeleton.

    CHEMINFORM, Issue 38 2008
    Ahmet Tutar
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]


    ChemInform Abstract: Hexabromoacetone and Ethyl Tribromoacetate: A Highly Efficient Reagent for Bromination of Alcohol.

    CHEMINFORM, Issue 24 2008
    Pratoomrat Tongkate
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]


    ChemInform Abstract: Bromination of 1,3- and 1,5-Dimethyl-1H-pyrazole-4-carbaldehydes.

    CHEMINFORM, Issue 17 2008
    O. S. Attaryan
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]


    ChemInform Abstract: Syntheses of 4,5-Disubstituted Oxazoles via Regioselective C-4 Bromination.

    CHEMINFORM, Issue 16 2008
    Bryan Li
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]


    ChemInform Abstract: {[K.18-Crown-6]Br3}n: A Unique Tribromide-Type and Columnar Nanotube-Like Structure for the Oxidative Coupling of Thiols and Bromination of Some Aromatic Compounds.

    CHEMINFORM, Issue 9 2008
    Mohammad Ali Zolfigol
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]


    ChemInform Abstract: One-Pot Oxidation and Bromination of 3,4-Diaryl-2,5-dihydrothiophenes Using Br2: Synthesis and Application of 3,4-Diaryl-2,5-dibromothiophenes.

    CHEMINFORM, Issue 2 2008
    Yizhe Dang
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]


    Practical Regioselective Bromination of Azaindoles and Diazaindoles.

    CHEMINFORM, Issue 25 2007
    Fabrice Gallou
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source]


    ortho-Substituted Iodobenzenes as Novel Organocatalysts for Bromination of Alkenes.

    CHEMINFORM, Issue 44 2006
    D. Christopher Braddock
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source]


    A New Regioselective Bromination of Activated Aromatic Rings.

    CHEMINFORM, Issue 22 2006
    Leonardo S. de Almeida
    Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source]


    A New Recyclable Ditribromide Reagent for Efficient Bromination under Solvent Free Condition.

    CHEMINFORM, Issue 43 2005
    Veerababurao Kavala
    Abstract For Abstract see ChemInform Abstract in Full Text. [source]


    Mild and Regioselective Bromination of Aromatic Compounds with N,N,N,,N,-Tetrabromobenzene-1,3-disulfonylamide and Poly(N-bromobenzene-1,3-disulfonylamide).

    CHEMINFORM, Issue 42 2005
    Ramin Ghorbani-Vaghei
    Abstract For Abstract see ChemInform Abstract in Full Text. [source]


    A [70]Fullerene Chloride, C70Cl16, Obtained by the Attempted Bromination of C70 in TiCl4.

    CHEMINFORM, Issue 41 2005
    Sergey I. Troyanov
    No abstract is available for this article. [source]


    An Intriguing Effect of Lithium Perchlorate Dispersed on Silica Gel in the Bromination of Aromatic Compounds by N-Bromosuccinimide.

    CHEMINFORM, Issue 38 2005
    Mojtaba Bagheri
    Abstract For Abstract see ChemInform Abstract in Full Text. [source]


    Simple Bromination of Activated Arenes by IBX Amide Resin and Tetraethylammonium Bromide.

    CHEMINFORM, Issue 28 2005
    Duk-Ki Kim
    Abstract For Abstract see ChemInform Abstract in Full Text. [source]


    Synthesis of 1,1,4,4-Tetrabromo-2-butenes and Related Compounds via Desilylation,Bromination of Silylated 1,3-Butadiene Derivatives.

    CHEMINFORM, Issue 17 2005
    Zhenfeng Xi
    Abstract For Abstract see ChemInform Abstract in Full Text. [source]


    Side Chain Bromination of Mono and Dimethyl Heteroaromatic and Aromatic Compounds by Solid Phase N-Bromosuccinimide Reaction Without Radical Initiator under Microwave.

    CHEMINFORM, Issue 49 2004
    Shyamaprosad Goswami
    Abstract For Abstract see ChemInform Abstract in Full Text. [source]


    Catalytic Asymmetric Bromination and Chlorination of ,-Ketoesters.

    CHEMINFORM, Issue 34 2004
    Mauro Marigo
    No abstract is available for this article. [source]


    Bromination of N-(o-Aminophenyl)-cis-4-cyclohexene-1,2-dicarboximide and cis-2-(2-Benzimidazolyl)-4-cyclohexene-1-carboxylic Acid.

    CHEMINFORM, Issue 26 2004
    S. I. Idrisova
    Abstract For Abstract see ChemInform Abstract in Full Text. [source]


    Monohalogenation (Bromination and Iodination) of Electron Rich Arenes by Tetraalkylammonium Halides in Presence of conc.

    CHEMINFORM, Issue 22 2004
    H2SO4.
    No abstract is available for this article. [source]