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Carboranate

Allylation of the 10-carborane 236 (pKa = 18-22) with diallyl carbonate is possible under neutral conditions to give 237[146], Allylation and rearrangement of the trialkylalkynylborane 238 affords the trisubstituted alkene 239 stereoselectively [ 147],... [Pg.322]

Placement of Extra Hydrogens. The placement of extra hydrogens plays a cmcial role ia determining the stmctures adopted by boranes and carboranes. However, the exact position of extra hydrogens sometimes depends on the physical state of the molecule, eg, the... [Pg.232]

G in the presence of a catalytic amount of a Lewis base such as dimethylether, (GH2)20. In addition to the gas-phase pyrolysis of diborane, can be prepared by a solution-phase process developed at Union Garbide Gorp. Decaborane is a key intermediate in the preparation of many carboranes and metaHa derivatives. As of this writing, this important compound is not manufactured on a large scale in the western world and is in short supply. Prices for decaborane in 1991 were up to 10,000/kg. [Pg.235]

Garboranes. The term carborane is widely used in American Hterature as a contraction of the lUPAC approved nomenclature carbaborane. The first carboranes, isomers of C2B2H, and were prepared in the mid-1950s at Olin Mathiesen. These carboranes were obtained as a mixture... [Pg.240]

The discovery (116) of the base-promoted degradation of the isomeric closo-Q,. . cages provided one of the most important carborane anion systems, the isomeric nido-Q,. ][ , anions,... [Pg.240]

Aside from their extensive use in metaHacarborane chemistry, the dicarboUide anions are important intermediates in the synthesis of other carborane compounds. For example, aqueous ferric chloride oxidation of the 1 anion results in the 10-vertex cage nido- b ()-(Z, 2 (H8) and the... [Pg.241]

Nonicosahedral carboranes can be prepared from the icosahedral species by similar degradation procedures or by reactions between boranes such as B H q and B H with acetylenes. The degradative reactions for intermediate C2B H 2 species (n = 6-9) have been described in detail (119). The small closo-Qr Yi 2 species (n = 3-5 are obtained by the direct thermal reaction (500—600°C) of B H using acetylene in a continuous-flow system. The combined yields approach 70% and the product distribution is around 5 5 1 of 2,4-C2B3H2 [20693-69-0] to l,6-C2B Hg [20693-67-8] to 1,5-C2B3H3 [20693-66-7] (120). A similar reaction (eq. 60) employing base catalysts, such as 2 6-dimethylpyridine at ambient temperature gives nido-2 >-(Z, ... [Pg.241]

As with the simple boranes, the closo carboranes are generally more thermally stable than the corresponding nido and arachno species. Thermal decomposition of nido and arachno carboranes often leads to one or more closo carborane. For example, pyrolysis of 2,3-C2B4Hg is another route to 2,3-C2B3H2 [30347-95-6], l,2-C2B4Hg [20693-68-9] and l,6-C2B4Hg [20693-67-8], and 1,5-C2B3H3 [20693-66-7] (123). [Pg.241]

A readily accessible carborane is nido-1 -(]5 i])- l- 1( 12 [I d-5], a 2witterionic species formally derived from [CB2qH23] by replacement of a by NH3. It has been shown (124) that this monocarbaborane can be obtained in excellent yield by treatment of B2QH24 with CN followed by passage through an acidic ion-exchange column (eq. 61). [Pg.241]

The related mono-A/-alkylated carboranes, 7-(NH2R)-7-CB2qH22, can be prepared by treatment of decaborane(14) with alkyl isocyanides (125). [Pg.241]


See other pages where Carboranate is mentioned: [Pg.65]    [Pg.79]    [Pg.82]    [Pg.134]    [Pg.274]    [Pg.161]    [Pg.161]    [Pg.161]    [Pg.479]    [Pg.1098]    [Pg.1098]    [Pg.1099]    [Pg.8]    [Pg.143]    [Pg.153]    [Pg.211]    [Pg.283]    [Pg.320]    [Pg.320]    [Pg.571]    [Pg.816]    [Pg.937]    [Pg.227]    [Pg.227]    [Pg.229]    [Pg.229]    [Pg.232]    [Pg.233]    [Pg.233]    [Pg.234]    [Pg.234]    [Pg.234]    [Pg.235]    [Pg.240]    [Pg.240]    [Pg.240]    [Pg.241]    [Pg.242]    [Pg.242]    [Pg.242]   
See also in sourсe #XX -- [ Pg.208 ]

See also in sourсe #XX -- [ Pg.208 ]




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1.2- Dehydro-o-carborane

Acetate carborane anions

Alkyl carborane

Allyl carboranes

Amines carboranes

Arac/ino-Carboranes—-continued CNPR theory

Arac/mo-Carboranes CNPR theory

Arachno Carboranes fragment

Arachno Carboranes skeletal bonding

Arachno Carboranes species

Basicity Carboranes

Benzo-o-carboranes

Benzyl carboranes

Bis ,reaction with carborane dianions

Bond Schemes for Closo Boranes and Carboranes

Bonding in boranes and carboranes

Borane and Carborane Anions

Borane and Carborane Cluster Compounds

Boranes and carboranes

Boranes and carboranes as ligands

Borohydride ions and carboranes

Boron Hydrides and Carboranes

Boron carborane rearrangement

Boron neutron capture therapy carboranes

Boron-containing alternating carborane

C/oso-Carboranes

CZoso-Carboranes

Cage Polyboranes and Carboranes

Cage compounds closoboranes and carboranes

Carbon carboranes

Carbon-Rich Carboranes and Their Metal

Carbon-Rich Carboranes and Their Metal Derivatives

Carbon-Rich Carboranes and Their Metal Russell N. Grimes

Carboran

Carboran

Carboranate anion

Carborane

Carborane (1, 2-dicarbaclovododecaborane

Carborane Derivatives

Carborane Derivatives with Estrogenic Properties

Carborane acidities

Carborane acids

Carborane acids, chemistry

Carborane adducts

Carborane analogs of cyclopentadienyl-metal complexes

Carborane anions

Carborane anions, metal complexes

Carborane cages

Carborane carboxylic acid derivatives

Carborane chemistry

Carborane chemistry supraicosahedral

Carborane cluster systems

Carborane clusters

Carborane complexes

Carborane cyclopentadienyl groups

Carborane definition

Carborane derivatives bearing

Carborane dianion, reaction with nickel

Carborane functionalization

Carborane functionalized dendronized

Carborane functionalized dendronized polymers

Carborane geometry

Carborane icosahedral

Carborane isoelectronic

Carborane lead

Carborane ligands

Carborane modified materials

Carborane phase

Carborane phenyl-modified

Carborane plastic

Carborane polyhedra

Carborane polymers

Carborane reactions with

Carborane residue

Carborane ring

Carborane siloxanes

Carborane skeletons beyond the icosahedron

Carborane stability

Carborane superacids

Carborane supramolecular chemistry

Carborane temperature

Carborane transition temperatures

Carborane-based building block

Carborane-containing grid-shaped polymers

Carborane-dithiolate ligand

Carborane-fullerene conjugated rods

Carborane-functionalized macrocycles

Carborane-metal complexes

Carborane-metal complexes, with

Carborane-phosphazene polymers

Carborane-silane polymers

Carborane-silane polymers synthesis

Carborane-siloxane polymers

Carborane-siloxane polymers synthesis

Carborane-siloxane-acetylenic polymers

Carborane-siloxanes synthesis

Carboranes

Carboranes

Carboranes 1.2- dicarbaclovododecaborane

Carboranes BNCT applications

Carboranes CH

Carboranes CNPR theory

Carboranes From Small Organoboranes to Clusters

Carboranes Metallocarboranes

Carboranes acidity

Carboranes alkyl halides

Carboranes alkynes

Carboranes and Intermediates Leading to the Preparation of Carbametallic Boron Hydride Derivatives

Carboranes and Organoboranes

Carboranes arachno

Carboranes aryl-substituted

Carboranes bond distances

Carboranes bonding

Carboranes bridge hydrogen

Carboranes carborane complexes

Carboranes chemical reactions

Carboranes classical structures

Carboranes classification

Carboranes computations

Carboranes connecting units

Carboranes copper

Carboranes definition

Carboranes degradation reactions

Carboranes dianions

Carboranes diborane derivative

Carboranes dicarbaboranes

Carboranes electron deficient

Carboranes estrogenic activity

Carboranes five-vertex

Carboranes formation

Carboranes gold phosphines

Carboranes heterocarboranes

Carboranes heterocyclic ring

Carboranes hydrophilic

Carboranes hydrophobic

Carboranes isoelectronic

Carboranes isomerization

Carboranes isomers

Carboranes lanthanide derivatives

Carboranes lithium derivatives

Carboranes medicinal application

Carboranes medicine

Carboranes metal complexes

Carboranes metallacarboranes

Carboranes methylated

Carboranes nine-vertex

Carboranes open-cage

Carboranes palladium derivatives

Carboranes peralkylated

Carboranes platinum complexes

Carboranes polyhedral rearrangements

Carboranes potassium derivatives

Carboranes preparation

Carboranes properties

Carboranes pyridine derivatives

Carboranes reactions

Carboranes reactions with

Carboranes rearrangement

Carboranes relative stabilities

Carboranes seven-vertex

Carboranes sodium derivatives

Carboranes structural patterns

Carboranes structural rules

Carboranes structures

Carboranes synthesis

Carboranes tetracarbon

Carboranes, characteristics

Carboranes, metalla

Closo Carboranes group charges

Closo Carboranes skeletal bonding

Closo Carboranes skeletal shapes

Closo Carboranes species

Closo carboranes

Cluster compounds carboranes

Cobalt complexes carborane

Coordination Number Pattern Recognition Theory of Carborane Structures

Coordination Number Pattern Recognition Theory of Carborane Structures Robert E. Williams

Coordination number pattern recognition Carboranes

Copper carborane complexes

Covalently attached carborane-containing polypyrrole

D -carborane siloxanes

Dicarba-closo-carboranes

Dicarbollide carborane derivatives

Dimethylsiloxane carborane

Drug delivery carborane

Electron counting carborane

Ethano-o-carborane)

Fluxional Processes in Boranes and Carboranes

Functionalization of carboranes

Gold complexes carborane

Gold complexes carboranes

Group IV-B Derivatives (Si, Ge, Sn) of o-Carborane

Hydrogen bonding carborane

Icosahedral carborane cages

Icosahedral carboranes

Icosahedral carboranes properties

Inclusion carborane

Iodo carboranes

Iron complexes carborane

Larger Boranes and Carboranes

M-Carborane

Macrocycles carborane ligands

Macrocycles, incorporating carboranes

Medicine, carborane polymers

Metal atom carboranes

Metallacarboranes anionic carborane ligands

Metallacarboranes carborane cage

Metallic derivatives of carboranes

Methyl carboranes

Methyl carboranes complexes

N-hexyl carborane

Neutral carboranes

Nickel complexes carborane

Nido Carboranes

Nido Carboranes anionic

Nido Carboranes skeletal bonding

Nido Carboranes skeletal shapes

Nido Carboranes species

Nido and Arachno Carboranes

Nido-carborane

Nido-carborane ligands

Ntdo-Carboranes

Ntdo-Carboranes CNPR theory

O-Carboran

O-Carborane

O-Carboranes

O-carborane clusters

Oligomeric carboranes

Organo carboranes

Ortho-carborane

Ortho-carborane, preparation

Pendant carborane groups, polymers with

Pentagonal pyramidal carboranes

Pharmacophores, carboranes

Pharmacophores, carboranes hydrophobic

Phosphine complexes carborane

Platinum complex carborane

Poly , carborane

Poly(carborane siloxanes)

Poly-m-carborane-siloxanes

Polymer carborane, properties

Polymers carborane-containing

Potassium, carborane derivatives

Pyramidal carboranes

Pyridines reactions with carboranes

Reactivity of o-Carborane

Residues carboranes

Ruthenium carborane complexes

Silyl carborane anions

Silyl carboranes

Silyl-carborane hybrid Si-based polymer

Silyl-carborane hybrid diethynylbenzene-silylene

Silyl-carborane hybrid diethynylbenzene-silylene polymer

Sodium complexes carborane

Some Aryl-Carboranes

Steroidal carboranes

Structure carborane

Subicosahedral carboranes

Supraicosahedral Carborane Systems

Supraicosahedral carboranes

Synthesis applications with carboranes

The Borane-Carborane Structural Pattern

Transition Metal-Carborane Complexes

Trinuclear carborane clusters

Vinyl carborane

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