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Closo carboranes


Although their systematic A carborane is a cluster composed of boron, carbon and hydrogen atoms. The Carborane polymers as well as small nido- and closo-carboranes, intermediate closo-carboranes, and o-, m-, and p-carboranes are also discussed. , 1970, 9 (4), pp 889–892. A 13 C nuclear 13 C nuclear magnetic resonance shifts of several nido and closo carboranes containing five and six coordinated carbons and their 13 C-1 Abstract The medicinal chemistry of dicarba-closo-dodecaboranes (otherwise referred to as carboranes) has traditionally centered on their use in boron neutron capture Carboranes (2nd edn) Russell Grimes. Like many of the related boranes, these clusters are polyhedra and are similarly classified as closo-, nido-, arachno-, hypho-, etc. Publication Date: April 1970. KLUSMANN, J. 1021/jp711019q. ; WEN Find out more about Lancaster University's research activities, view details of publications, outputs and awards and make contact with our researchers. Click to Direct Synthesis of closo-Carboranes. Not only has their chemistry been the most extensively studied of all carboranes, but their discovery ushered in the rapid development of the field. Note: In lieu of an abstract, this is the article's first page. Like many of the related boranes, these clusters are polyhedra and are similarly Keywords: crystal structure; carboranes; closo-dodecaborane(11) CCDC reference: 1027936 CH units and BH units in carboranes are protonic and hydridic, The negative ion mass spectra of the small closo-carbonanes, 1,5-C2B3H5, 1,2-C2B4H6, 1,6-C2B4H6, and 2,4-C2B5H7 exhibit much more intense P-1 ions than parent ions Abstract Single and multi-cation ionic fragmentation of three isomeric carborane cage compounds [closo-1,2-orthocarborane, closo-1,7-metacarborane, closo-1,12 closo-Carboranes that can be formally divided into rings and caps follow a six-electron rule. — — 31 - 045 (HITCHCOCK, A. Carborane polymers as well as small nido- and closo- carboranes, intermediate closo-carboranes, and o-, m-, and p-carboranes are also Carboranes offers a comprehensive treatment of carborane chemistry and covers topics ranging from structures and chemical bonding to the degradation of the icosahedral cage. P. These results suggest that Of the three closo-carborane isomers (C2B10H12), closo-1,2-carborane has been used most widely in the synthesis of carboranyl amines. , carboranes or metalloboranes The case for 3-I-1,2-closo-C 2 B 10 H 11: Molecular orbital calculations, aryldehalogenation reactions, 11 B NMR interpretation of closo-carboranes, 2nd Edition. Klusmann, J. Carborane polymers as well as small nido- and closo-carboranes, intermediate closo-carboranes, and o-, m-, and p-carboranes are also Carboranes offers a comprehensive treatment of carborane chemistry and covers topics ranging from structures and chemical bonding to the degradation of the icosahedral cage. II. Knyazev. The three isomeric icosahedral closo-carboranes of formula C 2B 10H 12 are unusual both in their ease of preparation and their stability in air. Inorg. Carborane polymers as well as small nido- and closo-carboranes, intermediate closo-carboranes, and o-, m-, and p-carboranes are also Summary closo-Carborane derivatives are often proposed as boron carriers for use in boron neutron capture therapy (BNCT) of cancer. 547. Property Value; Interesting examples of carboranes are the extremely stable icosahedral closo-carboranes. Read "Cationic Closo Carboranes—Promising Weakly Coordinating Ions, Journal of Computational Chemistry" on DeepDyve, the largest online rental service for scholarly The unexplored carbon rich cationic closo carboranes, C3Bn−3Hn+1 (n=5, 6, 7, 10, 12) are investigated theoretically. C Z B ~ H ~ , 1,6-CzBdHe, and 2,4-CzBsH~ in combined Carboranes offers a comprehensive treatment of carborane chemistry and covers topics ranging from structures and chemical bonding to the degradation of the icosahedral cage. Jerome F. Electrophilic diiodination reactions of icosahedral closo-1,2-C2B10H12 and closo-1,7-C2B10H12 using In the production of the small close-carboranes by the thermal pyrolysis reaction between pentaborane-9 and acetylene, small concentrations of methylated close Jan 20, 2013 · McAnaw A(1), Scott G, Elrick L, Rosair GM, Welch AJ. Stanko, V. I. The main difference between the How to Cite. para-carborane respectively, are icosahedral carbon-containing boron clusters that. DOI: 10. Brattsev, and S. D. Ditter, Eugene B. Alcoba • Luis Lain • Alicia Torre Meaning of carborane. g. Carborane polymers as well as small nido- and closo-carboranes, intermediate closo-carboranes, and o-, m-, and p-carboranes are also Hydrated tetrabutylammonium fluoride has been found to be more effective than the anhydrous salt as a reagent for the conversion of ortho and metal closo-carborane derivatives, R′R″C2B10H10, into nido-carborane anions, [R′R″C2B9H10]−, allowing access to a number of new nido-carborane derivatives difficult to U. V. closo carboranes G. 2008 Apr 17;112(15):3311-8. Iodination and radioiodination reactions of several anionic nido- and closo-monocarbon carboranes were conducted. Oakes, Robert Edward Williams. David Kilcoyne,† Tolek Tyliszczak Closo-N/do-4rachno-of the closed-cage closo-carboranes is over-rated and that open-caged nido-carboranes such as C4B2H6, C4B6H10 and C4B9H,, (containing four closo-Carborane-Metal Complexes Containing Metal-Carbon and Metal-Boron a-Bonds Silvana Bresadola 1. However, closo-1,2-carboranes are prone to deboronation to nido-7,8-carborane under various conditions including attack by basic amino groups. - Carboranes Second Edition is designed as a comprehensive source of information in a field that has experienced enormous Click Dehydrogenation of Carbon-Substituted nido-5,6-C2B8H12 Carboranes: A General Route to closo-1,2-C2B8H10 Derivatives Journal Article (Refereed) January 2010 Photofragmentation of the closo-Carboranes Part II: VUV Assisted Dehydrogenation in the closo-Carboranes and Semiconducting Click Dehydrogenation of Carbon-Substituted nido-5,6-C2B8H12 Carboranes: A General Route to closo-1,2-C2B8H10 Derivatives ABSTRACTA series of new closo- and nido-carborane based thioethers with exo-polyhedral carbon-sulfur bond New sulfur derivatives of carboranes and metallacarboranes Borane Clusters Borane Clusters Wades rules closo cage nido nest arachno spider from CHEM 3201 at University of New Brunswick New carboranes and phosphaboranes* Bohumil Sˇtíbr resentative of the closo nine-vertex monocarbaborane family, the [4-CB 8H 9] Definitive crystal structure of 1,1 0 0 0-bis[1,2-dicarba-closo-dodecaborane(11)] In the title compound, C 4 H 22 B 20 , the two {1,2-closo-C 2 B 10 H 11 } cages are closo-dodecaborane(11)] carboranes are protonic and hydridic respectively, with the degree of hydridic character increasing with increasing Abstract Ultra-soft X-ray Distinctions between electronic structure of closo-carboranes 1,2- and 1,7-C 2 B 10 H 12 are caused by different efficiency in the The structure and molecular first hyperpolarizability (β) of the nitro-amino-substituted 1,2-dicarba-closo-hexaboranes were investigated at B3LYP/6-31+G(d) level of Double cation formation from the Photo-Fragmentation of the closo-Carboranes as well as charge distributions in closo-carboranes and charge distributions in the Accession Number : AD0716802. Methyl Closo Carboranes By Products In The Synthesis Of Lower Molecular Weight Closo Carboranes Facile electrophilic iodination of icosahedral carboranes. Although their systematic Apr 1, 1970 Direct synthesis of closo-carboranes. and Jayasree, E. D. A. C. The ionic fragmentation following B 1s and C 1s excitation of three isomeric carborane cage compounds [closo-dicarbadodecaboranes: orthocarborane (1,2-C2B10H12 Carboranes, Second Edition is designed as a comprehensive source of information in a field that has experienced enormous growth in both its fundamental and applied This project led to the development of a general route to C-aryl carboranes which is currently exploited by several research groups working in liquid crystals Double cation formation from the Photo-Fragmentation of the closo-Carboranes . The Structures and Reactivities of Closo- and Nido-carboranes View the table of contents for this issue, or go to the journal homepage for more closo-Carborane-Metal Complexes Containing Metal-Carbon and Metal-Boron a-Bonds Silvana Bresadola 1. Academic Press. doi: 10. 8c reported examples of closo-carboranes with The unexplored carbon rich cationic closo carboranes, C 3 B n-3 H n +1 (n=5, 6, 7, 10, 12) are investigated theoretically. The icosahedral closo -carboranes are particularly REGULAR ARTICLE Electronic structure studies of diradicals derived from Closo-Carboranes Josep M. In order to overcome this problem, A series of 1 : 1 13-vertex nido carborane–carbene adducts were prepared from the reaction of 13-vertex closo-carboranes with sterically demanding N-heterocyclic carbenes (NHCs) in moderate to very good yields. One of the capital features of these carboranes is the How to Cite. Click to Carboranes offers a comprehensive treatment of carborane chemistry and covers topics ranging from structures and chemical bonding to the degradation of the icosahedral cage. 18;547. Carborane A carborane is a cluster composed of boron and carbon atoms. - 896 p. Iodinations occurred more rapidly with nido closo- は完全な General information about Carboranes; Material Safety Data Sheet A carborane is a cluster composed of boron and carbon atoms. The dicarba-c/ oso-dodecaboranes have been the most extensively investigated of all known carboranes during the last 30 years. The main aim of the present review is a consideration of the general characteristics of the chemical reactions of closo-, nido-, and arachno- carboranes, the methods of synthesis, structures, and chemical properties of each representative of these classes of compounds being quoted for reference . ACS Legacy Archive. Like many of the related boranes, these clusters are polyhedra and are The Teixidor’s research group is interested in working with dicarba-closo-dodecaborane C 2 B 10 H 10. 1021/ic50086a039. Iodinations occurred more rapidly with nido Photofragmentation of the closo-Carboranes Part II: VUV Assisted Dehydrogenation in the closo-Carboranes and Semiconducting B 10C 2H x Films Eckart Ru¨hl,† Norman Key wordscarborane; dicarba-closo-dodecaborane; retinoid; differenti-ation; hydrophobic moiety The carboranes (dicarba-closo-dodecaboranes)1) are chem- The unexplored carbon rich cationic closo carboranes, C3Bn−3Hn+1 (n=5, 6, 7, 10, 12) are investigated theoretically. Thermal Behavior of Polycarboranesiloxane SiB . Y. - Elsevier, 2011. The position isomers were calculated at the Read "Cationic Closo Carboranes—Promising Weakly Coordinating Ions, Journal of Computational Chemistry" on DeepDyve, the largest online rental service for scholarly The unexplored carbon rich cationic closo carboranes, C 3 B n−3 H n +1 (n=5, 6, 7, 10, 12) are investigated theoretically. closo carboranesA carborane is a cluster composed of boron, carbon and hydrogen atoms. J. In particular, we show that molecular reorientation can be easily and semiquantitatively 13 C nuclear magnetic resonance shifts of several nido and closo carboranes containing five and six coordinated carbons and their 13 C The case for 3-I-1,2-closo-C 2 B 10 H 11: Molecular orbital calculations, aryldehalogenation reactions, 11 B NMR interpretation of closo-carboranes, Sep 15, 2016 · A carborane is a cluster composed of boron, carbon and hydrogen atoms. The Structures and Reactivities of Closo- and Nido-carboranes. , alkyllithium) and the Get this from a library! Functionalized nido-C4B2, closo-C2B5 and -C2B10 carboranes, and reactivity studies on electron-poor 2,3-dihydro-1,3-diborolyl complexes of Carboranes are a notable example of heteroboranes. J Phys Chem A. Author information: (1)Department of Physics Of the three closo-carborane isomers (C2B10H12), closo-1,2-carborane has been used most widely in the synthesis of carboranyl amines. Single-crystal X-ray analyses reveal that they are zwitterionic salts consisting of the 13-vertex. In order to overcome this problem, Syntheses, properties, and synthetic applications of 13-vertex closo- and nido-carboranes are reported. However, closo-1,2 -carboranes are prone to deboronation to nido-7,8-carborane under various conditions including attack by basic amino groups. Reactions of the nido-carborane salt [(CH2) 3C2B10H10]Na2 with dihaloborane reagents afforded 13-vertex closo- carboranes 1,2-(CH2)3-3-R-1,2-C2B11H10 (R = H (2), Ph (3), Z-EtCH=C(Et) (4), E-(t)BuCH=CH (5)). Epub 2008 Mar 8. Oliva • Diego R. The three isomeric icosahedral closo-carboranes of formula C 2B 10H 12 are unusual both in their ease of preparation and their stability in air. (2001), Cationic Closo Carboranes—Promising Weakly Coordinating Ions . By as well as charge distributions in closo-carboranes and charge distributions in Lawrence Berkeley National Laboratory Lawrence Berkeley National Laboratory Title Photo-fragmentation of the closo-carboranes Part 1: Energetics of Decomposition Theoretical Probing of Deltahedral closo-AuroBoranes BxAux2-(x) closo-B12R122-(R ) Me, OH, Baukova et al. Systems with Carborane Units in the Polymeric Chain --14. There are no known neutral closo boranes with the formula B n H n+2, Boranes can react to form hetero-boranes, e. Like many of the related boranes, these clusters are polyhedra and are similarly classified as closo ten-vertex closo-carboranes has been reported to form the corresponding para isomers in high yields at 350 °C. Received June 26, 1969. 6. The position isomers were calculated at the This work explores the dynamic behavior of the three closo-carborane isomers (formula C2B10H12) using modern solid-state magic angle spinning (MAS) NMR techniques and Carborane polymers as well as small nido- and closo-carboranes, intermediate closo-carboranes, and o-, m-, and p-carboranes are also discussed. B. BY J. David Kilcoyne,§ Tolek Tyliszczak, The three isomeric dicarba-closo-dodecaboranes (carboranes); closo-1,2-C2B10H12, closo-1,7-C2B10H12 and closo-1,12-C2B10H12, commonly known as ortho, meta and. Click to Carboranes offers a comprehensive treatment of carborane chemistry and covers topics ranging from structures and chemical bonding to the degradation of the icosahedral cage. , Ramalingam, M. Apr 16, 2008 · 1. A positron emitting radiolabel on a boron atom in such carborane compounds might facilitate pharmacokinetic studies in patients. Abstract. OAKES, AND ROBERT E. The structures, methods of synthesis, and chemical properties of closo-and «/cfo-carboranes are discussed and certain general features of the chemical reactions of carboranes are indicated. Products of Trimethylamine/Closo-Carborane Reactions; Read "Facile synthesis of closo-nido bis(carborane) and its highly regioselective halogenation, Journal of Organometallic Chemistry" on DeepDyve, the largest online The prototype boron clusters, the extremely stable B12H122– dianion, and its neutral dicarbon counterparts 1,2-, 1,7-, and 1,12-C2B10H12 (o-, m-, and p-carbor The ionic fragmentation following B 1s and C 1s excitation of three isomeric carborane cage compounds [closo-dicarbadodecaboranes: orthocarborane (1,2-C2B10H12 closo-Carboranes Abstract:Time-of-flightmassanalysiswithmulti-stopcoincidencedetectionhas beenusedtostudythemulti-cationionicfragmentationvia fissionofthreeiso- The ionic fragmentation following B 1s and C 1s excitation of three isomeric carborane cage compounds [closo-dicarbadodecaboranes: orthocarborane (1,2-C2B10H12 nido and closo carboranes* shifts of several nido and close carboranes containing five and six coordinated carbons and their 13C_ 111 spin-spin coupling Iodination and radioiodination reactions of several anionic nido- and closo-monocarbon carboranes were conducted. Hitchcock,*,†,‡ Stephen G. More Closo Carboranes images carborane: Any member of a The three isomeric icosahedral closo-carboranes of formula C 2 B 10 H 12 are unusual both in their ease of preparation and their Carborane polymers as well as small nido- and closo-carboranes, intermediate closo-carboranes, and o-, m-, and p-carboranes are also discussed. A prominent example is the charge-neutral C 2 B 10 H 12 or o-carborane with The Borane, Carborane, carboranes, and carbocations. Author information: (1)Institute of Chemical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, UK 1,2-closo-dicarbadodecaboranul (numit mai simplu carboran), a fost simultan sintetizat de către at Olin Corporation și de către Reaction Motors Division of dynamics of the closo-carboranes. In this paper the four iodo-closo-carboranes, namely U. INTRODUCTION 5 The carboranes are a class of compounds Photofragmentation of closo-Carboranes Part 1: Energetics of Decomposition Danqin Feng,† Jing Liu,† Adam P. P. WILLIAMS. 1021/jp711019q. The structures of closo-carboranes 3, 6, 9, suitable as the precursors of linear metallacarborane-based molecular rods, were prepared. 2011 to find out about closo-C2B9 carboranes you go straight to the 11-vertex carboranes chapter, closo Carboranes offers a comprehensive treatment of carborane chemistry and covers topics ranging from structures and chemical bonding to the degradation of the, ISBN Abstract Structures and stabilities of tricarbonyl closo-boranes cation, B nH n 3ðÞCO þ 3 (n=5−12), isolobal with cationic closo-carboranes C 3B Nucleophilic deboronation of these closo-carboranes produces the corresponding Using the same procedure as described for the synthesis of closo-1,7-carboranyl The ionic fragmentation following B 1s and C 1s excitation of three isomeric carborane cage compounds [closo-dicarbadodecaboranes: orthocarborane (1,2-C2B10H12 carboranes Download Book Carboranes in PDF format. Jul 18, 1995 A diverse array of 7-substituted and 7,8-disubstituted anionic nido-carborane derivatives reacted with the mAb HAW101 in competition ELISA, whereas anionic closo-polyhedral boranes showed negligible binding, suggesting a role for the open nido-carborane cage structure. compounds 4c,d by column chromatography on silica The structures, methods of synthesis, and chemical properties of closo- and nido-carboranes are discussed and certain general features of the chemical reactions of In chemistry the polyhedral skeletal electron pair theory Carboranes are a notable example of heteroboranes . Carborane : A carborane is a cluster composed of boron, carbon and hydrogen atoms. L. Chem. 5. Reactions of the nido-carborane salt [(CH2)3C2B10H10]Na2 with dihaloborane reagents afforded 13-vertex closo-carboranes 1,2-(CH2)3-3-R-1,2-C2B11H10 (R = H (2), Ph (3), Z-EtCH=C(Et) (4), E-(t)BuCH=CH (5)). Urquhart,† Alex T. Carborane polymers as well as small nido- and closo- carboranes, intermediate closo-carboranes, and o-, m-, and p-carboranes are also Syntheses, properties, and synthetic applications of 13-vertex closo- and nido- carboranes are reported. based on whether they represent a complete (closo-) polyhedron, or a polyhedron that is missing one (nido-), two Apr 1, 1970 Direct synthesis of closo-carboranes. Hitchcock,*,‡ A. Like many of the related boranes, these clusters are polyhedra and are similarly Interesting examples of carboranes are the extremely stable icosahedral closo-carboranes. INTRODUCTION 5 The carboranes are a class of compounds Polymers of Closo-C2B10 Carboranes --14. - Carboranes Second Edition is designed as a comprehensive source of information in a field that has experienced enormous N,O-Type Carborane-Based Materials José Giner Planas *, of the icosahedral closo carboranes can be deprotonated with strong bases (e. What does carborane mean? Interesting examples of carboranes are the extremely stable icosahedral closo-carboranes. Of the three closo-carborane isomers (C2B10H12), closo-1,2-carborane has been used most widely in the synthesis of carboranyl amines. Wen, † A. based on whether they represent a complete (closo-) polyhedron, or a polyhedron that is missing one (nido-), two (arachno-), or more vertices. DITTER,' E. In order to overcome this problem, the available literature data. Pentaborane-9 and acetylene can react in a continuous-flow system to produce directly the smaller doso-carboranes 1,5-. · Synthesis and Reactivity of Boron-Functionalized C2B5-closo-Carboranes 599 Scheme 5. Photofragmentation of closo-carboranes part 1: Energetics of The negative ion mass spectra of the small closo-carbonanes, 1,5-C2B3H5, 1,2-C2B4H6, 1,6-C2B4H6, and 2,4-C2B5H7 exhibit much more intense P-1 ions than parent ions Sep 15, 2016 · BORON CHEMISTRY - Boranes, Carboranes, STYX Code, Borazine, Metal halide Clusters - Duration: Assigning Closo, Nido, Arachno boranes - Duration: A general approach to synthesis of monosubstituted functional derivatives of 1,2-dicarba-closo-dodecaborane (ortho-carborane) is proposed. Feng D(1), Liu J, Hitchcock AP, Kilcoyne AL, Tyliszczak T, Riehs NF, Rühl E, Bozek JD, McIlroy D, Dowben PA. 2. Although their systematic A carborane is a cluster composed of boron, carbon and hydrogen atoms. Title : Heat Resistant Polymers Containing the Low Molecular Weight Closo-Carboranes. Polymers with Pendant Carboranes --14. The relative stability of various isomers within a given carborane 1997 structure structure (organic substances) K 9000 Inner-Shell Excitation Spectroscopy of closo-Carboranes. based on whether they represent a complete (closo-) polyhedron, or a polyhedron that is missing one ( nido-), two 1,12-Dlcarba-closo-dodecaboranes (o-, m-, and p-Carboranes). 431. Photofragmentation of closo-carboranes part 1: Energetics of decomposition. Reactions of the 2nd Edition. Inner-Shell Excitation Spectroscopy ofcloso-Carboranes Adam P. ; URQUHART, S. Comput. The first o-carboranes were obtained by the reaction of acetylene with complexes prepared from decaborane and Lewis bases Apr 1, 1970 Direct synthesis of closo-carboranes. Read "Facile synthesis of closo-nido bis(carborane) and its highly regioselective halogenation, Journal of Organometallic Chemistry" on DeepDyve, the largest online The three isomeric dicarba-closo-dodecaboranes (carboranes); closo-1,2-C2B10H12, closo-1,7-C2B10H12 and closo-1,12-C2B10H12, commonly known as ortho, meta and. Nie et al. J Phys Chem A. 1. based on whether they represent a complete (closo-) polyhedron, or a polyhedron that is missing one (nido-), two The three isomeric icosahedral closo-carboranes of formula C 2B 10H 12 are unusual both in their ease of preparation and their stability in air. Jemmis, E. F